Objective． An internal fixation apparatus—— distraction reduction fixation system(DRFS) was designed to satisfy the clinical needs for spondylolisthesis. Methods. Since 1996, 53 patients were treated with DRFS. Amo...Objective． An internal fixation apparatus—— distraction reduction fixation system(DRFS) was designed to satisfy the clinical needs for spondylolisthesis. Methods. Since 1996, 53 patients were treated with DRFS. Among them, 35 had spondylolisthesis, 12 had lumbar canal stenosis accompanied with instability, 2 had vertebral tumors and 4 suffered from spinal fracture. The average age was 53.6 years old (ranged 24～ 72yrs). The mean time for follow- up was 30.6 months (16～ 44 months). Results． The slip rate was 0.15± 0.10 before operation, and decreased to 0.09± 0.07 after operation. Entire slip reposition was achieved in 19 cases (54.3％ ). The change in height of the intervertebral space within the fixation segments was 0.7± 0.17. Conclusion． DRFS achieved better results for spondylolisthesis less II degree and no other adverse effects were found. Compared with other foreign and domestic techniques, it had advantages in less implants, less operation gears required and ease to utilize in operation. It was proved to be an ideal internal fixation apparatus.展开更多
Objective To explore the effects of the anterior internal fixation systems on the post-operative lateral angulation in treatment of thoracolumbar fractures.Methods A retrospective study was done to analyze the 172 pat...Objective To explore the effects of the anterior internal fixation systems on the post-operative lateral angulation in treatment of thoracolumbar fractures.Methods A retrospective study was done to analyze the 172 patients who had展开更多
Plasma nitrogen fixation(PNF)has been emerging as a promising technology for greenhouse gasfree and renewable energy-based agriculture.Yet,most PNF studies seldom address practical application-specific issues.In this ...Plasma nitrogen fixation(PNF)has been emerging as a promising technology for greenhouse gasfree and renewable energy-based agriculture.Yet,most PNF studies seldom address practical application-specific issues.In this work,we present the development of a compact and automatic PNF system for on-site agricultural applications.The system utilized a gliding-arc discharge as the plasma source and employed a dual-loop design to generate NO_(x)from air and water under atmospheric conditions.Experimental results showed that the system with a dualloop design performs well in terms of energy costs and production rates.Optimal operational parameters for the system were determined through experimentation,resulting in an energy cost of 13.9 MJ mol^(-1)and an energy efficiency of 16 g kWh^(-1)for NO_(3)^(-)production,respectively.Moreover,the concentration of exhausted NO_(x)was below the emission standards.Soilless lettuce cultivation experiments demonstrated that NO_(x)^(-)produced by the PNF system could serve as liquid nitrate nitrogen fertilizer.Overall,our work demonstrates the potential of the developed PNF system for on-site application in the production of green-leaf vegetables.展开更多
Objective:To compare the clinical therapeutic effect of bridge combined internal fixation system and locking compression plate internal fixation in the treatment of displaced midshaft clavicle fractures by emphaticall...Objective:To compare the clinical therapeutic effect of bridge combined internal fixation system and locking compression plate internal fixation in the treatment of displaced midshaft clavicle fractures by emphatically observing fracture healing and shoulder joint function.Methods:Totally 44 elderly patients with Robinson type 2B displaced midshaft clavicle fractures were included from the Department of Orthopaedics,Shenyang Fourth People's Hospital during February 2016 and December 2018,including 23 males and 21 females,mean age(69.8±10.2)years old.The patients were divided into a bridge combined internal fixation system group(bridge group,n=22)and a locking compression plate internal fixation group(plate group,n=22)according to the internal fixation methods.The operation time,intraoperative blood loss,fracture healing time,and postoperative complications were recorded.At 12 months after surgery,the shoulder joint Constant-Murley score and DASH score were used to assess the recovery of joint function.The serum levels of bone turnover biochemical markers procollagen I N-terminal peptide(P1NP),cross-linked Carboxy-terminal telopeptide of typeⅠcollagen(CTX-I),and osteoblast specific factor(OSF)were measured before and 3 months after surgery.Results:The operation time,intraoperative blood loss and fracture healing time of the bridge group were significantly shorter than those of the plate group(P<0.05).Constant scores and DASH scores in the bridge group were significantly better than those of the plate group at 12 months after surgery(P<0.05).Serum levels of CTX-I was significantly decreased,while the P1NP and OSF were significantly increased compared with before surgery in the both groups(P<0.05),and the changes were more obvious in the bridge group(P<0.05).The incidence of complications was similar between the two groups(P<0.05).Conclusion:Compared with the locking plate system,the bridge combined internal fixation system can effectively improve the operation efficiency,have more benefits on fracture healing,better promote the recovery of patients'function,and reduce the failure rate of internal fixation,thus providing a better choice to treat displaced midshaft clavicle fractures by intraoperative internal fixation.展开更多
Background Absorbable cranial flap fixation products,represented by Aesculap^(®)CranioFix absorbable clamp,are widely used in neurosurgery.However,the product has some shortcomings,as it is not entirely biodegrad...Background Absorbable cranial flap fixation products,represented by Aesculap^(®)CranioFix absorbable clamp,are widely used in neurosurgery.However,the product has some shortcomings,as it is not entirely biodegradable,the lower disc’s angle cannot be adjusted,and there is a failure to readjust after fixation.To address these issues,MedArt Technology Co.,Ltd.from China has come up with a high-purity PLLA combined with an innovative structural design to develop a novel cranial flap fixation system that is more convenient to operate,has a better resetting effect,and can be fully absorbed.This study aims to verify its safety and effectiveness through in vitro experiments and clinical trials.Methods In this study,the absorbable cranial flap fixation system of MedArt was used as the experimental group,and the CranioFix absorbable clamp constituted the control group.The material properties and the changing trend of mechanical properties of the two groups were compared by accelerated degradation experiments in vitro.A multicenter,randomized,parallel,positive-controlled,non-inferiority clinical study was conducted with a 48-week follow-up.The shortening degree of the bone flap gap,qualified rate of bone flap displacement,changing trend of implant volume,and occurrence of postoperative adverse events were compared between the two groups.Results The results of the in vitro accelerated degradation showed that in terms of the decrease in intrinsic viscosity,the control and experimental groups took 7 days and 14 days,respectively,to reach the test endpoint.For mechanical properties,the control group and experimental groups lost clinical safety fixation significance on the 3rd and 4th day after the degradation began,respectively.Regarding the release of degradation products,the control group showed a burst of lactic acid release during the first 3-7 days,while the experimental group released lactic acid slowly and constantly.In the clinical study,90 patients were randomly enrolled,87 of whom completed the operation,with an average age of 50.The 3D reconstruction of CT images showed that the bone flap gaps in both groups were less than 2 mm after surgery.The qualified rate of bone flap displacement in the experimental group was 100%after surgery.In contrast,in the control group,there was one unqualified case at 1 week after surgery and two unqualified cases at 6 weeks,12 weeks,24 weeks,and 48 weeks.The residual volume of the implant in the experimental group was closer to 50%(about 48.8%)48 weeks after surgery,than in the control group(about 43.9%)12 weeks after surgery.Regarding safety,only one possible device-related adverse event occurred in the control group,with an incidence rate of 2.22%,manifested as poor healing at the incision site.Conclusions The study has verified that the experimental group had better stability,longer biodegradation time,and better mechanical properties than the control group.Moreover,the experimental group could significantly narrow the cranial flap gap,reduce the flap displacement,and promote skull healing after craniotomy.It shows a fairly reliable fixation effect and safety.展开更多
Rethinking carbon fixation beyond the Calvin cycle.The Calvin-Benson-Bassham(CBB)cycle is the central pathway for CO_(2) fixation.However,its efficiency is limited by two major carbon losses.The first is the oxidative...Rethinking carbon fixation beyond the Calvin cycle.The Calvin-Benson-Bassham(CBB)cycle is the central pathway for CO_(2) fixation.However,its efficiency is limited by two major carbon losses.The first is the oxidative decarboxylation of pyruvate to acetyl-coenzyme A(CoA),which causes the loss of one out of every three fixed carbons.展开更多
BACKGROUND The purpose of this systematic review was to evaluate the clinical and radiological outcomes at short-term follow-up following suture button fixation for the management of ligamentous Lisfranc injuries.AIM ...BACKGROUND The purpose of this systematic review was to evaluate the clinical and radiological outcomes at short-term follow-up following suture button fixation for the management of ligamentous Lisfranc injuries.AIM To assess the effectiveness of suture button fixation in managing ligamentous Lisfranc injuries through a systematic evaluation of short-term clinical and radiological outcomes.METHODS During March 2024,the PubMed,EMBASE,and Cochrane library databases were systematically reviewed to identify clinical studies examining outcomes following suture button fixation for the management of ligamentous Lisfranc injuries.Data regarding patient demographics,pathological characteristics,subjective clinical outcomes,radiological outcomes,complications,and failure rates were extracted and analyzed.RESULTS Eight studies were included.In total,94 patients(94 feet)underwent suture button fixation for the management of ligamentous Lisfranc injuries at a weighted mean follow-up of 27.2±10.2 months.The American Orthopaedic Foot and Ankle Society score improved from a weighted mean pre-operative score of 39.2±11.8 preoperatively to a post-operative score of 82.8±5.4.The weighted mean visual analogue scale score improved from a weighted mean pre-operative score of 7.7±0.6 preoperatively to a post-operative score of 2.0±0.4.In total,100%of patients returned to sport at a mean time of 16.8 weeks.The complication rate was 5%,the most common complication of which was residual midfoot stiffness(3.0%).No failures nor secondary surgical procedures were recorded.CONCLUSION This systematic review demonstrated that suture button fixation for ligamentous Lisfranc injuries produced improved clinical outcomes at short-term follow-up.In addition,there was an excellent return-to-sport rate(100%)at a weighted mean time of 16.8 weeks.This review highlights that suture button fixation is a potent surgical treatment strategy for ligamentous Lisfranc injuries;however,caution should be taken when evaluating this data in light of the lack of high quality,comparative studies,and short-term follow-up.展开更多
Purpose:This study was designed to compare the clinical efficacy of"8"and"0"wire fixation systems combined with double-head cannulated compression screws or Kirschner wires for the treatment of tra...Purpose:This study was designed to compare the clinical efficacy of"8"and"0"wire fixation systems combined with double-head cannulated compression screws or Kirschner wires for the treatment of transverse patellar fractures.Methods:From September 2011 to September 2018,patients with closed transverse patellar fractures treated with a double-head compression screw or Kirschner wire were included and analyzed retrospectively.Patients with patellar fractures combined with distal femoral fractures,tibial plateau fracture or preoperative lower limb dysfunction were excluded.The patients treated with the"8"tension band wire fixation system and Kirschner wire were taken as Group A;those treated with the"0"fixation system and Kirschner wire were taken as Group B;those treated with the"8"fixation system and double-head cannulated compression screw were taken as group C;and those treated with the"0"fixation system and double-head cannulated compression screw were taken as group D.Six weeks and one year after the operation and every month from the third month after the operation until the fractures healed,an X-ray examination was performed to identify fracture healing.The time of fracture healing and postoperative complications of the four groups were compared.One year after the operation,knee function was evaluated by Bostman’s score.Results:During the study period,168 patients with patellar fractures were treated by operations,and 88 patients were excluded because the fracture type did not meet the requirements or because there were combined fractures of the distal femur or tibial plateau.As a result,80 patients were included in this study,20 in each group.All the patients were followed up for an average period of 12.2 months.Compared with Group A,patients in Group D presented less postoperative discomfort in the prepatellar region,quicker fracture healing,less fixation failure and better postoperative knee function scores(all p<0.05).The incidence of internal fixation failure in Group(B+D)was lower than that in Group(A+C)(p>0.05).Conclusion:The"0"wire fixation system combined with a double-head cannulated compression screw seems to be more beneficial than the other three fixation systems for the treatment of transverse patellar fractures.展开更多
In China, the abuse of chemical nitrogen （N） fertilizer results in decreasing N use efficiency （NUE）, wasting resources and causing serious environmental problems. Cereal-legume intercropping is widely used to enh...In China, the abuse of chemical nitrogen （N） fertilizer results in decreasing N use efficiency （NUE）, wasting resources and causing serious environmental problems. Cereal-legume intercropping is widely used to enhance crop yield and improve resource use efficiency, especially in Southwest China. To optimize N utilization and increase grain yield, we conducted a two-year field experiment with single-factor randomized block designs of a maize-soybean intercropping system （IMS）. Three N rates, NN （no nitrogen application）, LN （lower N application： 270 kg N ha-1）, and CN （conventional N application： 330 kg N ha-1）, and three topdressing distances of LN （LND）, e.g., 15 cm （LND1）, 30 cm （LND2） and 45 cm （LND3） from maize rows were evaluated. At the beginning seed stage （R5）, the leghemoglobin content and nitrogenase activity of LND3 were 1.86 mg plant-1 and 0.14 mL h-1 plant-1, and those of LND1 and LND2 were increased by 31.4 and 24.5%, 6.4 and 32.9% compared with LND3, respectively. The ureide content and N accumulation of soybean organs in LND1 and LND2 were higher than those of LND3. The N uptake, NUE and N agronomy efficiency （NAE） of IMS under CN were 308.3 kg ha-1, 28.5%, and 5.7 kg grain kg-1 N, respectively; however, those of LN were significantly increased by 12.4, 72.5, and 51.6% compared with CN, respectively. The total yield in LND1 and LND2 was increased by 12.3 and 8.3% compared with CN, respectively. Those results suggested that LN with distances of 15-30 cm from the topdressing strip to the maize row was optimal in maize-soybean intercropping. Lower N input with an optimized fertilization location for IMS increased N fixation and N use efficiency without decreasing grain yield.展开更多
Biological nitrogen (N) fixation (BNF) plays a significant role in maintaining soil fertility in paddy field ecosystems. Rice variety influences BNF, but how different rice varieties regulate BNF and associated diazot...Biological nitrogen (N) fixation (BNF) plays a significant role in maintaining soil fertility in paddy field ecosystems. Rice variety influences BNF, but how different rice varieties regulate BNF and associated diazotroph communities has not been quantified. Airtight, field-based 15N2-labelling grow th chamber experiments were used to assess the BNF capac 辻 y of different rice varie ties. In addition, both the 16S rRNA and nifH genes were sequenced to assess the influence of different rice varieties on bacterial and diazotrophic communities in paddy soils. After subjecting a rice-soil system to 74 d of continuous airtight, field-based 15N2 labelling in pots in a growth chamber, the amounts of fixed N were 22.3 and 38.9 kg ha^-1 in inbred japonica (W23) and hybrid indica (IIY) rice cultivars plan ted in the rice-soil systems, respectively, and only 1%—2.5% of the fixed N was allocated to the rice plants and weeds. A greater abundance of diazotrophs was found in the surface soil (0-1 cm) under IIY than under W23. Sequencing of the 16S rRNA gene showed significantly greater abundances of the cyanobacterial genera Nostoc, Anabaena, and Cylindrospermum under IIY than under W23. Sequencing of the nifH gene also showed a significantly greater abundance of Nostoc under IIY than under W23. These results indicate that the hybrid rice cultivar (IIY) promoted BNF to a greater extent than the inbred rice cultivar (W23) and that the increase in BNF might have been due to the enhanced heterocystous cyanobacteria Nostoc.展开更多
Objective:To evaluate the therapeutic effect of dynamic fixation with a hook plate-double loop plate internal fixation system for high-energy acromioclavicular joint complex dislocation(denoted as HACD,i.e.,Rockwood t...Objective:To evaluate the therapeutic effect of dynamic fixation with a hook plate-double loop plate internal fixation system for high-energy acromioclavicular joint complex dislocation(denoted as HACD,i.e.,Rockwood type III-V dislocation).Methods:Fifty-eight patients with HACD were selected and evenly divided by drawing lots.The experimental group underwent ligament reconstruction treatment,while the reference group received hook plate fixation treatment.The efficacy and other indicators were compared between the groups.Results:The overall effective rates between the groups were similar(P>0.05).The experimental group had a longer surgical duration,lower pain scores at 6 months postoperatively,higher shoulder joint function scores,and a lower complication rate,with P<0.05 when compared between groups.Conclusion:The effectiveness of the double loop plate internal fixation system ligament reconstruction treatment for patients with HACD is comparable to that of hook plate fixation treatment.Although the surgical duration is slightly longer,postoperative pain is milder,facilitating the recovery of shoulder joint function in patients and offering higher safety.展开更多
Purpose:The present study aimed to systematically review and compare 2 femoral autograft fixation techniques,namely,interference screws and suture anchors,for isolated medial patellofemoral ligament reconstruction in ...Purpose:The present study aimed to systematically review and compare 2 femoral autograft fixation techniques,namely,interference screws and suture anchors,for isolated medial patellofemoral ligament reconstruction in patients with recurrent patellofemoral instability at mid-to long-term follow-up.Methods:A literature search was performed in September 2020.All studies reporting the outcomes of primary isolated medial patellofemoral ligament reconstruction for recurrent patellofemoral instability were considered for inclusion.Only studies reporting the type of femoral autograft fixation under examination were considered.Studies reporting data from patients with elevated tibial tuberosity-tibial groove,patella alta,and/or Dejour’s trochlear dysplasia types C and D,were not included.Only articles reporting data with a minimum follow-up period of 18 months were considered.Results:Data from 19 studies(615 patients)were retrieved.The overall age was 24.4±6.7 years(mean±SD).The mean follow-up was 46.5±20.9 months.There were 76 patients in the anchor group and 539 in the screw group.Comparability was found with regard to age and follow-up duration between the 2 study groups.There was comparability between the Kujala,Lysholm,and Tegner scores at baseline.At the last follow-up,no worthy differences were found in terms of mean Kujala(+2.1%;p=0.04),Lysholm(+1.7%;p=0.05),and Tegner(+15.8%;p=0.05)scores.Although complications occurred almost exclusively in the screw cohort,no statistically significant difference was found.Conclusion:Femoral autograft fixation through interference screws or suture anchors report similar clinical scores and rate of apprehension test,persistent joint instability,re-dislocations,and revisions.These results must be interpreted within the limitations of the present study.展开更多
Ammonium fixation and adsorption experiments were conducted to study the effect of potassium on ammonium fixation into interlayer of vermiculite and ammonium adsorption at the surface of vermiculite both in the binary...Ammonium fixation and adsorption experiments were conducted to study the effect of potassium on ammonium fixation into interlayer of vermiculite and ammonium adsorption at the surface of vermiculite both in the binary (NH-4～(+)-Ca～(2+)) and ternary (NH-4～(+)-K～(+)-Ca～(2+)) systems. In the ammonium fixation experiment, 5 mmol NH-4～(+) kg～(-1) was added alone, or after, before or simultaneously with 5 mmol K～(+) kg～(-1) to the vermiculite (vermiculite:solution = 1:1), and the incubation was conducted for 3 days under constant 20℃. In the adsorption experiment, after addition of 10 mmol Ca～(2+) L～(-1) as matrix ions, either NH-4～(+) alone with a concentration series from 0.1 to 5.0 mmol NH-4～(+) L～(-1) (binary exchange system of NH-4～(+) and Ca～(2+) or NH-4～(+) together with 5 mmol K～(+) L～(-1) (ternary exchange system of NH-4 ～(+), K～(+) and Ca～(2+) was added to vermiculite at a vermiculite to solution ratio of l:10 for 24-h equilibrium. The results of the fixation experiment showed that the presence of K～(+) increased NH-4～(+) fixation for all the treatments, regardless of the addition orders. For ammonium adsorption a linear relationship between activity ratios of NH-4～(+) to Ca～(2+) and Mg～(2+) in the equilibrium solutions (ARNH-4) and increases of exchangeable NH-4～(+) at the surface of vermiculite after 24- h equilibrium (△Ex-NH-4) was shown for almost the whole concentration ranges tested. Compared with the binary system, the slope of the curve of the ternary system was steeper, indicating a more intensive adsorption of NH-4～(+) in the presence of K～(+). It was demonstrated that K ～(+) did not reduce the ammounium fixation into the interlayer and ammonium adsororption at the surface of vermiculite, which indicated that, under the experimental conditions of this study, K～(+) did neither occupy the sites for NH-4～(+)-fixation in the interlayer nor the sites for NH-4～(+)-adsorption at the surface of vermiculite.展开更多
BACKGROUND Infection at the pin tract is a frequent and feared complication of external fixators(EF).The type of pin material and coatings have been regarded as possibly influencing infection rates.Over the last 20 ye...BACKGROUND Infection at the pin tract is a frequent and feared complication of external fixators(EF).The type of pin material and coatings have been regarded as possibly influencing infection rates.Over the last 20 years,few prospective clinical studies and systematic reviews addressed the role of coated pins on the rate of pin site infection in human clinical studies.AIM To assess the EF literature over the past 20 years on the clinical benefits of pins manufactured from varied materials and coating systems and their possible role in pin tract infection rates.METHODS We performed a systematic review according to the PRISMA and PICOS guidelines using four scientific platforms:PubMed,LiLacs,SciELO,and Cochrane.We searched the literature for related publications over the past 20 years.RESULTS A literature search yielded 29 articles,among which seven met the inclusion criteria.These studies compared stainless-steel pins and pins coated with hydroxyapatite(HA),titanium and silver.The pin tract infection definitions were arbitrary and not standardized among studies.Most studies included a low number of patients in the analysis and used a short follow-up time.Three metaanalyses were carried out,comparing stainless steel vs silver pins,stainless steel vs HA-coated pins,and titanium vs HA-coated pins.None of this analysis resulted in statistically significant differences in pin tract infection rates.CONCLUSION Currently,no clinical evidence supports the advantage of EF pins manufactured with materials other than stainless steel or coated over uncoated pins in reducing the rates of pin tract infections.A standardized definition of pin tract infection in external fixation is still lacking.展开更多
Copolymerization of carbon dioxide with epichlorohydrin was successfully carried out by usingNd(P_(204))_3-Al(i-Bu)_3 as catalyst (P_(204))=(RO)_2 POO--,R=CH_3 (CH_2),CH(C_2H_5) CH_2--). Addi-tion of carbonyl compound...Copolymerization of carbon dioxide with epichlorohydrin was successfully carried out by usingNd(P_(204))_3-Al(i-Bu)_3 as catalyst (P_(204))=(RO)_2 POO--,R=CH_3 (CH_2),CH(C_2H_5) CH_2--). Addi-tion of carbonyl compounds into the catalyst decreased the carbon dioxide content of the copoly-mer to some extent. Compared to nonpolar solvents, ethereal and moderate polar solvents werefavourable to obtaining higher carbon dioxide content copolymer. The coincidence of these resultswith the assumed copolymerization scheme clearly indicated that the copolymerization proceeds via coordinate anionic mechanism.展开更多
Objective:Evaluate the efficacy,safety and economy of small splints and plate in the treatment of distal radius fractures(DRFs).Methods:Seven electronic databases,including PubMed,EMBASE,Cochrane Library,sinomed,CNKI,...Objective:Evaluate the efficacy,safety and economy of small splints and plate in the treatment of distal radius fractures(DRFs).Methods:Seven electronic databases,including PubMed,EMBASE,Cochrane Library,sinomed,CNKI,VIP and Wanfang,were searched for the original study.Literature was screened according to the inclusion and exclusion criteria,and the methodological quality of the included studies was evaluated by Cochrane risk bias assessment tool.The software Revman 5.4 was used for data analysis.Results:A total of 19 studies were included in the study.The clinical effective rate of the plate group[RR=0.96,95%CI(0.93,0.99),P=0.007],Radial inclination[MD=-1.85,95%CI(-2.93,-0.77),P=0.0008],Ulnar inclination[MD=-2.49,95%CI(-3.95,-1.04),P=0.0007],relative height of radius[MD=-1.63,95%CI(-2.40,-0.86),P<0.0001]were better than those in small splints group.There was no significant difference in fracture healing time[MD=-4.39,95%CI(-9.07,0.28),P=0.07]and complications[RR=1.57,95%CI(0.98,2.52),P=0.06]between the two groups.In terms of treatment cost[MD=-2.83,95%CI(-3.37,-2.30),P<0.00001],the small splint group was better than the plate treatment group.Conclusion:Compared with small splints therapy,plate internal fixation has advantages in clinical effective rate and imaging scores.There is no significant difference in fracture healing time and complications between the two groups.In terms of treatment cost,small splint therapy is better than plate therapy.Clinical treatment should be selected and formulated according to the individual situation,demands and clinical practice of patients.展开更多
Objective:To investigate the short-term and medium-term efficacy of one-stage posterior debridement,intertransverse process bone grafting and screw-rod system fixation in the treatment of Brucella spondylitis of the l...Objective:To investigate the short-term and medium-term efficacy of one-stage posterior debridement,intertransverse process bone grafting and screw-rod system fixation in the treatment of Brucella spondylitis of the lumbar spine.Method:156 cases of Brucella spondylitis of lumbar spine were selected and divided into experimental group(n=80)and combined group(n=76)according to different surgical methods.The experimental group was treated with one-stage posterior debridement,intertransverse process bone grafting and screw-rod system fixation.The combined group was treated with one-stage anterior debridement and intertransverse process bone grafting combined with posterior internal fixation.The operative indexes and clinical effects were compared between the two groups.Result:The operation time,intraoperative bleeding volume and time of landing after operation in the experimental group were less than those in the combined group,with statistical significance(P<0.05).VAS score,ODI index,Cobb angle and Frankel grade of nervous function in the two groups were significantly improved after 3 months and 36 months of treatment(P<0.05),but there was no significant difference between the two groups at the same time(P>0.05).There was no significant difference in the excellent and good rate between the two groups after 3 and 36 months of treatment(P>0.05).There was no recurrence of the lesion in both groups.The intertransverse process bone graft healed and the screw-rod system was well fixed.Conclusion:One-stage posterior debridement,intertransverse process bone grafting and screw-rod system fixation for treatment of Brucella spondylitis of lumbar spine are effective,with short operation time and less trauma,which are worthy of clinical promotion.展开更多
The study of Nitrogen fixation, uptake, and leaching at different soil depths in the co-cultivation of maize and soybean under phosphorus fertilization is important for sustainable agriculture. This study was conducte...The study of Nitrogen fixation, uptake, and leaching at different soil depths in the co-cultivation of maize and soybean under phosphorus fertilization is important for sustainable agriculture. This study was conducted in Quzhou, Hebei Province, China, with MC812 maize and Jidou12 soybean varieties. Soil samples were taken from each plot to create a composite sample. The results show that nitrogen concentration varies at different depths and is higher in all treatments between 40 and 100 cm. Incorporating intercropping of maize and soybeans into farming practices can lead to more sustainable and environmentally friendly agriculture in China.展开更多
文摘Objective． An internal fixation apparatus—— distraction reduction fixation system(DRFS) was designed to satisfy the clinical needs for spondylolisthesis. Methods. Since 1996, 53 patients were treated with DRFS. Among them, 35 had spondylolisthesis, 12 had lumbar canal stenosis accompanied with instability, 2 had vertebral tumors and 4 suffered from spinal fracture. The average age was 53.6 years old (ranged 24～ 72yrs). The mean time for follow- up was 30.6 months (16～ 44 months). Results． The slip rate was 0.15± 0.10 before operation, and decreased to 0.09± 0.07 after operation. Entire slip reposition was achieved in 19 cases (54.3％ ). The change in height of the intervertebral space within the fixation segments was 0.7± 0.17. Conclusion． DRFS achieved better results for spondylolisthesis less II degree and no other adverse effects were found. Compared with other foreign and domestic techniques, it had advantages in less implants, less operation gears required and ease to utilize in operation. It was proved to be an ideal internal fixation apparatus.
文摘Objective To explore the effects of the anterior internal fixation systems on the post-operative lateral angulation in treatment of thoracolumbar fractures.Methods A retrospective study was done to analyze the 172 patients who had
基金supported by the Science and Technology Project of State Grid Corporation of China(No.5400202133157A-0-0-00)partially supported by the State Grid Gansu Electric Power Company,China。
文摘Plasma nitrogen fixation(PNF)has been emerging as a promising technology for greenhouse gasfree and renewable energy-based agriculture.Yet,most PNF studies seldom address practical application-specific issues.In this work,we present the development of a compact and automatic PNF system for on-site agricultural applications.The system utilized a gliding-arc discharge as the plasma source and employed a dual-loop design to generate NO_(x)from air and water under atmospheric conditions.Experimental results showed that the system with a dualloop design performs well in terms of energy costs and production rates.Optimal operational parameters for the system were determined through experimentation,resulting in an energy cost of 13.9 MJ mol^(-1)and an energy efficiency of 16 g kWh^(-1)for NO_(3)^(-)production,respectively.Moreover,the concentration of exhausted NO_(x)was below the emission standards.Soilless lettuce cultivation experiments demonstrated that NO_(x)^(-)produced by the PNF system could serve as liquid nitrate nitrogen fertilizer.Overall,our work demonstrates the potential of the developed PNF system for on-site application in the production of green-leaf vegetables.
文摘Objective:To compare the clinical therapeutic effect of bridge combined internal fixation system and locking compression plate internal fixation in the treatment of displaced midshaft clavicle fractures by emphatically observing fracture healing and shoulder joint function.Methods:Totally 44 elderly patients with Robinson type 2B displaced midshaft clavicle fractures were included from the Department of Orthopaedics,Shenyang Fourth People's Hospital during February 2016 and December 2018,including 23 males and 21 females,mean age(69.8±10.2)years old.The patients were divided into a bridge combined internal fixation system group(bridge group,n=22)and a locking compression plate internal fixation group(plate group,n=22)according to the internal fixation methods.The operation time,intraoperative blood loss,fracture healing time,and postoperative complications were recorded.At 12 months after surgery,the shoulder joint Constant-Murley score and DASH score were used to assess the recovery of joint function.The serum levels of bone turnover biochemical markers procollagen I N-terminal peptide(P1NP),cross-linked Carboxy-terminal telopeptide of typeⅠcollagen(CTX-I),and osteoblast specific factor(OSF)were measured before and 3 months after surgery.Results:The operation time,intraoperative blood loss and fracture healing time of the bridge group were significantly shorter than those of the plate group(P<0.05).Constant scores and DASH scores in the bridge group were significantly better than those of the plate group at 12 months after surgery(P<0.05).Serum levels of CTX-I was significantly decreased,while the P1NP and OSF were significantly increased compared with before surgery in the both groups(P<0.05),and the changes were more obvious in the bridge group(P<0.05).The incidence of complications was similar between the two groups(P<0.05).Conclusion:Compared with the locking plate system,the bridge combined internal fixation system can effectively improve the operation efficiency,have more benefits on fracture healing,better promote the recovery of patients'function,and reduce the failure rate of internal fixation,thus providing a better choice to treat displaced midshaft clavicle fractures by intraoperative internal fixation.
基金funded by MedArt Technology Co.,Ltd.,located in Chengdu,China.The company supplied cranial flap fixation products utilized in the study and provided financial support for the research.
文摘Background Absorbable cranial flap fixation products,represented by Aesculap^(®)CranioFix absorbable clamp,are widely used in neurosurgery.However,the product has some shortcomings,as it is not entirely biodegradable,the lower disc’s angle cannot be adjusted,and there is a failure to readjust after fixation.To address these issues,MedArt Technology Co.,Ltd.from China has come up with a high-purity PLLA combined with an innovative structural design to develop a novel cranial flap fixation system that is more convenient to operate,has a better resetting effect,and can be fully absorbed.This study aims to verify its safety and effectiveness through in vitro experiments and clinical trials.Methods In this study,the absorbable cranial flap fixation system of MedArt was used as the experimental group,and the CranioFix absorbable clamp constituted the control group.The material properties and the changing trend of mechanical properties of the two groups were compared by accelerated degradation experiments in vitro.A multicenter,randomized,parallel,positive-controlled,non-inferiority clinical study was conducted with a 48-week follow-up.The shortening degree of the bone flap gap,qualified rate of bone flap displacement,changing trend of implant volume,and occurrence of postoperative adverse events were compared between the two groups.Results The results of the in vitro accelerated degradation showed that in terms of the decrease in intrinsic viscosity,the control and experimental groups took 7 days and 14 days,respectively,to reach the test endpoint.For mechanical properties,the control group and experimental groups lost clinical safety fixation significance on the 3rd and 4th day after the degradation began,respectively.Regarding the release of degradation products,the control group showed a burst of lactic acid release during the first 3-7 days,while the experimental group released lactic acid slowly and constantly.In the clinical study,90 patients were randomly enrolled,87 of whom completed the operation,with an average age of 50.The 3D reconstruction of CT images showed that the bone flap gaps in both groups were less than 2 mm after surgery.The qualified rate of bone flap displacement in the experimental group was 100%after surgery.In contrast,in the control group,there was one unqualified case at 1 week after surgery and two unqualified cases at 6 weeks,12 weeks,24 weeks,and 48 weeks.The residual volume of the implant in the experimental group was closer to 50%(about 48.8%)48 weeks after surgery,than in the control group(about 43.9%)12 weeks after surgery.Regarding safety,only one possible device-related adverse event occurred in the control group,with an incidence rate of 2.22%,manifested as poor healing at the incision site.Conclusions The study has verified that the experimental group had better stability,longer biodegradation time,and better mechanical properties than the control group.Moreover,the experimental group could significantly narrow the cranial flap gap,reduce the flap displacement,and promote skull healing after craniotomy.It shows a fairly reliable fixation effect and safety.
基金supported by the National Key R&D Program of China(2025YFC3409200 and 2022YFC3401800)the Hundred Talents Program of the Chinese Academy of Sciences(E3J56201)+2 种基金the Director-Led Scientific Research and Innovation Fund Program(SZJJ2024-019 and SZJJ2024-032)the Beijing Life Science Academy(2023200CB0070 and 2023000CB0040)the Science and Technology Program of Tangshan(24150214C).
文摘Rethinking carbon fixation beyond the Calvin cycle.The Calvin-Benson-Bassham(CBB)cycle is the central pathway for CO_(2) fixation.However,its efficiency is limited by two major carbon losses.The first is the oxidative decarboxylation of pyruvate to acetyl-coenzyme A(CoA),which causes the loss of one out of every three fixed carbons.
文摘BACKGROUND The purpose of this systematic review was to evaluate the clinical and radiological outcomes at short-term follow-up following suture button fixation for the management of ligamentous Lisfranc injuries.AIM To assess the effectiveness of suture button fixation in managing ligamentous Lisfranc injuries through a systematic evaluation of short-term clinical and radiological outcomes.METHODS During March 2024,the PubMed,EMBASE,and Cochrane library databases were systematically reviewed to identify clinical studies examining outcomes following suture button fixation for the management of ligamentous Lisfranc injuries.Data regarding patient demographics,pathological characteristics,subjective clinical outcomes,radiological outcomes,complications,and failure rates were extracted and analyzed.RESULTS Eight studies were included.In total,94 patients(94 feet)underwent suture button fixation for the management of ligamentous Lisfranc injuries at a weighted mean follow-up of 27.2±10.2 months.The American Orthopaedic Foot and Ankle Society score improved from a weighted mean pre-operative score of 39.2±11.8 preoperatively to a post-operative score of 82.8±5.4.The weighted mean visual analogue scale score improved from a weighted mean pre-operative score of 7.7±0.6 preoperatively to a post-operative score of 2.0±0.4.In total,100%of patients returned to sport at a mean time of 16.8 weeks.The complication rate was 5%,the most common complication of which was residual midfoot stiffness(3.0%).No failures nor secondary surgical procedures were recorded.CONCLUSION This systematic review demonstrated that suture button fixation for ligamentous Lisfranc injuries produced improved clinical outcomes at short-term follow-up.In addition,there was an excellent return-to-sport rate(100%)at a weighted mean time of 16.8 weeks.This review highlights that suture button fixation is a potent surgical treatment strategy for ligamentous Lisfranc injuries;however,caution should be taken when evaluating this data in light of the lack of high quality,comparative studies,and short-term follow-up.
文摘Purpose:This study was designed to compare the clinical efficacy of"8"and"0"wire fixation systems combined with double-head cannulated compression screws or Kirschner wires for the treatment of transverse patellar fractures.Methods:From September 2011 to September 2018,patients with closed transverse patellar fractures treated with a double-head compression screw or Kirschner wire were included and analyzed retrospectively.Patients with patellar fractures combined with distal femoral fractures,tibial plateau fracture or preoperative lower limb dysfunction were excluded.The patients treated with the"8"tension band wire fixation system and Kirschner wire were taken as Group A;those treated with the"0"fixation system and Kirschner wire were taken as Group B;those treated with the"8"fixation system and double-head cannulated compression screw were taken as group C;and those treated with the"0"fixation system and double-head cannulated compression screw were taken as group D.Six weeks and one year after the operation and every month from the third month after the operation until the fractures healed,an X-ray examination was performed to identify fracture healing.The time of fracture healing and postoperative complications of the four groups were compared.One year after the operation,knee function was evaluated by Bostman’s score.Results:During the study period,168 patients with patellar fractures were treated by operations,and 88 patients were excluded because the fracture type did not meet the requirements or because there were combined fractures of the distal femur or tibial plateau.As a result,80 patients were included in this study,20 in each group.All the patients were followed up for an average period of 12.2 months.Compared with Group A,patients in Group D presented less postoperative discomfort in the prepatellar region,quicker fracture healing,less fixation failure and better postoperative knee function scores(all p<0.05).The incidence of internal fixation failure in Group(B+D)was lower than that in Group(A+C)(p>0.05).Conclusion:The"0"wire fixation system combined with a double-head cannulated compression screw seems to be more beneficial than the other three fixation systems for the treatment of transverse patellar fractures.
基金supported by the National Key Research and Development Program of China (2016YFD0300202)the National Natural Science Foundation of China (31671625, 31271669)
文摘In China, the abuse of chemical nitrogen （N） fertilizer results in decreasing N use efficiency （NUE）, wasting resources and causing serious environmental problems. Cereal-legume intercropping is widely used to enhance crop yield and improve resource use efficiency, especially in Southwest China. To optimize N utilization and increase grain yield, we conducted a two-year field experiment with single-factor randomized block designs of a maize-soybean intercropping system （IMS）. Three N rates, NN （no nitrogen application）, LN （lower N application： 270 kg N ha-1）, and CN （conventional N application： 330 kg N ha-1）, and three topdressing distances of LN （LND）, e.g., 15 cm （LND1）, 30 cm （LND2） and 45 cm （LND3） from maize rows were evaluated. At the beginning seed stage （R5）, the leghemoglobin content and nitrogenase activity of LND3 were 1.86 mg plant-1 and 0.14 mL h-1 plant-1, and those of LND1 and LND2 were increased by 31.4 and 24.5%, 6.4 and 32.9% compared with LND3, respectively. The ureide content and N accumulation of soybean organs in LND1 and LND2 were higher than those of LND3. The N uptake, NUE and N agronomy efficiency （NAE） of IMS under CN were 308.3 kg ha-1, 28.5%, and 5.7 kg grain kg-1 N, respectively; however, those of LN were significantly increased by 12.4, 72.5, and 51.6% compared with CN, respectively. The total yield in LND1 and LND2 was increased by 12.3 and 8.3% compared with CN, respectively. Those results suggested that LN with distances of 15-30 cm from the topdressing strip to the maize row was optimal in maize-soybean intercropping. Lower N input with an optimized fertilization location for IMS increased N fixation and N use efficiency without decreasing grain yield.
基金the National Natural Science Foundation of China (Nos. 31870500, 40871146, and 41501273)the Special Project on the Basis of National Science and Technology of China (No. 2015FY110700)+1 种基金the Knowledge Innovation Program of Chinese Academy of Sciences (No. KZCX2-EW-409)the Technology Supporting Project of Jiangsu Province (No. BE2013451)
文摘Biological nitrogen (N) fixation (BNF) plays a significant role in maintaining soil fertility in paddy field ecosystems. Rice variety influences BNF, but how different rice varieties regulate BNF and associated diazotroph communities has not been quantified. Airtight, field-based 15N2-labelling grow th chamber experiments were used to assess the BNF capac 辻 y of different rice varie ties. In addition, both the 16S rRNA and nifH genes were sequenced to assess the influence of different rice varieties on bacterial and diazotrophic communities in paddy soils. After subjecting a rice-soil system to 74 d of continuous airtight, field-based 15N2 labelling in pots in a growth chamber, the amounts of fixed N were 22.3 and 38.9 kg ha^-1 in inbred japonica (W23) and hybrid indica (IIY) rice cultivars plan ted in the rice-soil systems, respectively, and only 1%—2.5% of the fixed N was allocated to the rice plants and weeds. A greater abundance of diazotrophs was found in the surface soil (0-1 cm) under IIY than under W23. Sequencing of the 16S rRNA gene showed significantly greater abundances of the cyanobacterial genera Nostoc, Anabaena, and Cylindrospermum under IIY than under W23. Sequencing of the nifH gene also showed a significantly greater abundance of Nostoc under IIY than under W23. These results indicate that the hybrid rice cultivar (IIY) promoted BNF to a greater extent than the inbred rice cultivar (W23) and that the increase in BNF might have been due to the enhanced heterocystous cyanobacteria Nostoc.
文摘Objective:To evaluate the therapeutic effect of dynamic fixation with a hook plate-double loop plate internal fixation system for high-energy acromioclavicular joint complex dislocation(denoted as HACD,i.e.,Rockwood type III-V dislocation).Methods:Fifty-eight patients with HACD were selected and evenly divided by drawing lots.The experimental group underwent ligament reconstruction treatment,while the reference group received hook plate fixation treatment.The efficacy and other indicators were compared between the groups.Results:The overall effective rates between the groups were similar(P>0.05).The experimental group had a longer surgical duration,lower pain scores at 6 months postoperatively,higher shoulder joint function scores,and a lower complication rate,with P<0.05 when compared between groups.Conclusion:The effectiveness of the double loop plate internal fixation system ligament reconstruction treatment for patients with HACD is comparable to that of hook plate fixation treatment.Although the surgical duration is slightly longer,postoperative pain is milder,facilitating the recovery of shoulder joint function in patients and offering higher safety.
文摘Purpose:The present study aimed to systematically review and compare 2 femoral autograft fixation techniques,namely,interference screws and suture anchors,for isolated medial patellofemoral ligament reconstruction in patients with recurrent patellofemoral instability at mid-to long-term follow-up.Methods:A literature search was performed in September 2020.All studies reporting the outcomes of primary isolated medial patellofemoral ligament reconstruction for recurrent patellofemoral instability were considered for inclusion.Only studies reporting the type of femoral autograft fixation under examination were considered.Studies reporting data from patients with elevated tibial tuberosity-tibial groove,patella alta,and/or Dejour’s trochlear dysplasia types C and D,were not included.Only articles reporting data with a minimum follow-up period of 18 months were considered.Results:Data from 19 studies(615 patients)were retrieved.The overall age was 24.4±6.7 years(mean±SD).The mean follow-up was 46.5±20.9 months.There were 76 patients in the anchor group and 539 in the screw group.Comparability was found with regard to age and follow-up duration between the 2 study groups.There was comparability between the Kujala,Lysholm,and Tegner scores at baseline.At the last follow-up,no worthy differences were found in terms of mean Kujala(+2.1%;p=0.04),Lysholm(+1.7%;p=0.05),and Tegner(+15.8%;p=0.05)scores.Although complications occurred almost exclusively in the screw cohort,no statistically significant difference was found.Conclusion:Femoral autograft fixation through interference screws or suture anchors report similar clinical scores and rate of apprehension test,persistent joint instability,re-dislocations,and revisions.These results must be interpreted within the limitations of the present study.
基金Project (No. 39770427) supported by the National Natural Science Foundation of China.
文摘Ammonium fixation and adsorption experiments were conducted to study the effect of potassium on ammonium fixation into interlayer of vermiculite and ammonium adsorption at the surface of vermiculite both in the binary (NH-4～(+)-Ca～(2+)) and ternary (NH-4～(+)-K～(+)-Ca～(2+)) systems. In the ammonium fixation experiment, 5 mmol NH-4～(+) kg～(-1) was added alone, or after, before or simultaneously with 5 mmol K～(+) kg～(-1) to the vermiculite (vermiculite:solution = 1:1), and the incubation was conducted for 3 days under constant 20℃. In the adsorption experiment, after addition of 10 mmol Ca～(2+) L～(-1) as matrix ions, either NH-4～(+) alone with a concentration series from 0.1 to 5.0 mmol NH-4～(+) L～(-1) (binary exchange system of NH-4～(+) and Ca～(2+) or NH-4～(+) together with 5 mmol K～(+) L～(-1) (ternary exchange system of NH-4 ～(+), K～(+) and Ca～(2+) was added to vermiculite at a vermiculite to solution ratio of l:10 for 24-h equilibrium. The results of the fixation experiment showed that the presence of K～(+) increased NH-4～(+) fixation for all the treatments, regardless of the addition orders. For ammonium adsorption a linear relationship between activity ratios of NH-4～(+) to Ca～(2+) and Mg～(2+) in the equilibrium solutions (ARNH-4) and increases of exchangeable NH-4～(+) at the surface of vermiculite after 24- h equilibrium (△Ex-NH-4) was shown for almost the whole concentration ranges tested. Compared with the binary system, the slope of the curve of the ternary system was steeper, indicating a more intensive adsorption of NH-4～(+) in the presence of K～(+). It was demonstrated that K ～(+) did not reduce the ammounium fixation into the interlayer and ammonium adsororption at the surface of vermiculite, which indicated that, under the experimental conditions of this study, K～(+) did neither occupy the sites for NH-4～(+)-fixation in the interlayer nor the sites for NH-4～(+)-adsorption at the surface of vermiculite.
文摘BACKGROUND Infection at the pin tract is a frequent and feared complication of external fixators(EF).The type of pin material and coatings have been regarded as possibly influencing infection rates.Over the last 20 years,few prospective clinical studies and systematic reviews addressed the role of coated pins on the rate of pin site infection in human clinical studies.AIM To assess the EF literature over the past 20 years on the clinical benefits of pins manufactured from varied materials and coating systems and their possible role in pin tract infection rates.METHODS We performed a systematic review according to the PRISMA and PICOS guidelines using four scientific platforms:PubMed,LiLacs,SciELO,and Cochrane.We searched the literature for related publications over the past 20 years.RESULTS A literature search yielded 29 articles,among which seven met the inclusion criteria.These studies compared stainless-steel pins and pins coated with hydroxyapatite(HA),titanium and silver.The pin tract infection definitions were arbitrary and not standardized among studies.Most studies included a low number of patients in the analysis and used a short follow-up time.Three metaanalyses were carried out,comparing stainless steel vs silver pins,stainless steel vs HA-coated pins,and titanium vs HA-coated pins.None of this analysis resulted in statistically significant differences in pin tract infection rates.CONCLUSION Currently,no clinical evidence supports the advantage of EF pins manufactured with materials other than stainless steel or coated over uncoated pins in reducing the rates of pin tract infections.A standardized definition of pin tract infection in external fixation is still lacking.
文摘Copolymerization of carbon dioxide with epichlorohydrin was successfully carried out by usingNd(P_(204))_3-Al(i-Bu)_3 as catalyst (P_(204))=(RO)_2 POO--,R=CH_3 (CH_2),CH(C_2H_5) CH_2--). Addi-tion of carbonyl compounds into the catalyst decreased the carbon dioxide content of the copoly-mer to some extent. Compared to nonpolar solvents, ethereal and moderate polar solvents werefavourable to obtaining higher carbon dioxide content copolymer. The coincidence of these resultswith the assumed copolymerization scheme clearly indicated that the copolymerization proceeds via coordinate anionic mechanism.
基金Special Project for Seedling Cultivation funded by Special Fund of Chinese Central Government for Basic Scientific Research Operations in Commonweal Research Institutes(No.ZZ11-084)。
文摘Objective:Evaluate the efficacy,safety and economy of small splints and plate in the treatment of distal radius fractures(DRFs).Methods:Seven electronic databases,including PubMed,EMBASE,Cochrane Library,sinomed,CNKI,VIP and Wanfang,were searched for the original study.Literature was screened according to the inclusion and exclusion criteria,and the methodological quality of the included studies was evaluated by Cochrane risk bias assessment tool.The software Revman 5.4 was used for data analysis.Results:A total of 19 studies were included in the study.The clinical effective rate of the plate group[RR=0.96,95%CI(0.93,0.99),P=0.007],Radial inclination[MD=-1.85,95%CI(-2.93,-0.77),P=0.0008],Ulnar inclination[MD=-2.49,95%CI(-3.95,-1.04),P=0.0007],relative height of radius[MD=-1.63,95%CI(-2.40,-0.86),P<0.0001]were better than those in small splints group.There was no significant difference in fracture healing time[MD=-4.39,95%CI(-9.07,0.28),P=0.07]and complications[RR=1.57,95%CI(0.98,2.52),P=0.06]between the two groups.In terms of treatment cost[MD=-2.83,95%CI(-3.37,-2.30),P<0.00001],the small splint group was better than the plate treatment group.Conclusion:Compared with small splints therapy,plate internal fixation has advantages in clinical effective rate and imaging scores.There is no significant difference in fracture healing time and complications between the two groups.In terms of treatment cost,small splint therapy is better than plate therapy.Clinical treatment should be selected and formulated according to the individual situation,demands and clinical practice of patients.
基金2018 Hebei health technology research and achievement transformation key project(No.zh2018014)2018 Hebei Medical applicable technology tracking project(No.gl2018074)+1 种基金2017 Zhangjiakou city level plan(No.17120010d)2018 Hebei North University School level scientific research project(No.yb2018010)
文摘Objective:To investigate the short-term and medium-term efficacy of one-stage posterior debridement,intertransverse process bone grafting and screw-rod system fixation in the treatment of Brucella spondylitis of the lumbar spine.Method:156 cases of Brucella spondylitis of lumbar spine were selected and divided into experimental group(n=80)and combined group(n=76)according to different surgical methods.The experimental group was treated with one-stage posterior debridement,intertransverse process bone grafting and screw-rod system fixation.The combined group was treated with one-stage anterior debridement and intertransverse process bone grafting combined with posterior internal fixation.The operative indexes and clinical effects were compared between the two groups.Result:The operation time,intraoperative bleeding volume and time of landing after operation in the experimental group were less than those in the combined group,with statistical significance(P<0.05).VAS score,ODI index,Cobb angle and Frankel grade of nervous function in the two groups were significantly improved after 3 months and 36 months of treatment(P<0.05),but there was no significant difference between the two groups at the same time(P>0.05).There was no significant difference in the excellent and good rate between the two groups after 3 and 36 months of treatment(P>0.05).There was no recurrence of the lesion in both groups.The intertransverse process bone graft healed and the screw-rod system was well fixed.Conclusion:One-stage posterior debridement,intertransverse process bone grafting and screw-rod system fixation for treatment of Brucella spondylitis of lumbar spine are effective,with short operation time and less trauma,which are worthy of clinical promotion.
文摘The study of Nitrogen fixation, uptake, and leaching at different soil depths in the co-cultivation of maize and soybean under phosphorus fertilization is important for sustainable agriculture. This study was conducted in Quzhou, Hebei Province, China, with MC812 maize and Jidou12 soybean varieties. Soil samples were taken from each plot to create a composite sample. The results show that nitrogen concentration varies at different depths and is higher in all treatments between 40 and 100 cm. Incorporating intercropping of maize and soybeans into farming practices can lead to more sustainable and environmentally friendly agriculture in China.
