BACKGROUND The volar approach with plate fixation is the gold standard for treating distal radius fractures,often requiring incision of the pronator quadratus(PQ)muscle.Preserving the PQ during surgery may facilitate ...BACKGROUND The volar approach with plate fixation is the gold standard for treating distal radius fractures,often requiring incision of the pronator quadratus(PQ)muscle.Preserving the PQ during surgery may facilitate early postoperative recovery.However,conventional minimally invasive plate osteosynthesis(MIPO)techniques frequently necessitate multiple(3-4)intraoperative fluoroscopic adjustments to achieve optimal plate positioning,which can inadvertently damage the PQ muscle.Based on our clinical observations,we developed a novel 3-point positioning technique to minimize PQ injury while ensuring accurate plate placement.Preliminary results demonstrate promising early clinical outcomes.AIM To retrospectively analyze distal radius fractures treated using the 3-point positioning-assisted MIPO technique with preservation of the PQ.METHODS The 3-point positioning technique was applied:The Kirschner wire was inserted after fluoroscopy and was correctly adjusted the position of the plate above the PQ.With the aid of Kirschner wires positioning the PQ stripping was performed only once,and the plate then placed in a correct and satisfactory position.Operation time,incision length,wrist pain score,upper extremity function disabilities of the arm,shoulder and hand(DASH)score,wrist Gartland-Werley score,wrist grip strength,and range of motion were among the quantitative variables recorded.Qualitative variables including AO fracture classification,intraoperative and postoperative complications were evaluated.RESULTS At a mean follow-up of 6.9±0.8 months,the mean scar length was 25.4±1.5 mm,the pain score was 0.7±0.6,the DASH score for the upper limb was 4.7±1.3,and the Gartland-Werley score for wrist function was 4.1±1.1 at the last follow-up.Mean flexion was 97.3%,extension was 97.0%,pronation was 98.9%,supination was 98.9%,and grip strength was 86.6%compared to contralateral values.No unfavorable intraoperative or postoperative complications occurred.CONCLUSION The 3-point positioning technique may reduce the damage to the PQ muscle and is a safe and effective method for MIPO for distal radius fractures.展开更多
随着全球导航卫星系统技术的发展,广播星历精度逐渐提升,为基于广播星历实现的精密单点定位(precise point position with broadcast ephemerides, BE-PPP)带来了希望。本文基于2022年6月至2023年11月的BDS-3广播星历分析了其误差特性,...随着全球导航卫星系统技术的发展,广播星历精度逐渐提升,为基于广播星历实现的精密单点定位(precise point position with broadcast ephemerides, BE-PPP)带来了希望。本文基于2022年6月至2023年11月的BDS-3广播星历分析了其误差特性,并基于此改正相应误差实现BDS-3 BE-PPP。根据实验结果,本文首次发现BDS-3广播和精密轨道间的赫尔默特旋转参数在2023年8月逐渐减小,这也改善了赫尔默特七参数的根和平方(root-sum-square,RSS)。2023年9月、10月和11月的RSS平均值分别为5.16 cm、5.51 cm和5.12 cm,明显优于其余月份。通过修正BDS-3广播轨道Z向年周期平移误差和引入广播星历视线方向综合误差参数进行BE-PPP数据处理,2月的静态和仿动态的三维定位精度分别为32.6 cm和52.5 cm;11月使用精度提升的BDS-3广播星历的静态和仿动态的三维定位精度分别为26.6cm和43.5cm,相比2月,分别提升了18.4%和15.5%。展开更多
国际卫星导航服务组织在第三次重处理中推出了卫星姿态四元数产品,该产品不仅有利于地影期间各分析中心精密产品的综合,同时也有助于提高卫星姿态异常时期精密单点定位(precise point positioning,PPP)的可靠性。对武汉大学(Wuhan Unive...国际卫星导航服务组织在第三次重处理中推出了卫星姿态四元数产品,该产品不仅有利于地影期间各分析中心精密产品的综合,同时也有助于提高卫星姿态异常时期精密单点定位(precise point positioning,PPP)的可靠性。对武汉大学(Wuhan University,WHU)、德国地学研究中心和欧洲定轨中心3家分析中心提供的4种北斗三号卫星导航系统(BeiDou-3 satellite navigation system,BDS-3)最终/快速姿态四元数产品进行了比较,分析了各个产品对不同类型的BDS-3卫星所采用的姿态模型的特点,并探究了不同卫星姿态对BDS-3动态PPP定位的影响。结果表明,在卫星太阳高度角接近0°时,不同分析中心采用了不同的BDS-3姿态模型,其偏航角差异可高达约120°;使用各个分析中心配套的姿态四元数,地影期间动态PPP三维定位精度都得到一定的提升,其中,采用WHU快速产品的提升率较为显著,与采用名义姿态相比,使用四元数产品后,动态PPP的三维定位精度可提高约18.4%。虽然采用目前公开的BDS-3模型姿态对PPP定位有所改善,但不同分析中心对精密产品估计时采用的卫星姿态可能会有所不同,因此,配套使用各分析中心提供的姿态四元数才能获得可靠的定位结果。展开更多
基金Supported by Fujian Provincial Clinical Medical Research Center for First Aid and Rehabilitation in Orthopaedic Trauma,No.2020Y2014Fuzhou Health Technology Innovation Platform Construction Project,No.2019-S-wp2.
文摘BACKGROUND The volar approach with plate fixation is the gold standard for treating distal radius fractures,often requiring incision of the pronator quadratus(PQ)muscle.Preserving the PQ during surgery may facilitate early postoperative recovery.However,conventional minimally invasive plate osteosynthesis(MIPO)techniques frequently necessitate multiple(3-4)intraoperative fluoroscopic adjustments to achieve optimal plate positioning,which can inadvertently damage the PQ muscle.Based on our clinical observations,we developed a novel 3-point positioning technique to minimize PQ injury while ensuring accurate plate placement.Preliminary results demonstrate promising early clinical outcomes.AIM To retrospectively analyze distal radius fractures treated using the 3-point positioning-assisted MIPO technique with preservation of the PQ.METHODS The 3-point positioning technique was applied:The Kirschner wire was inserted after fluoroscopy and was correctly adjusted the position of the plate above the PQ.With the aid of Kirschner wires positioning the PQ stripping was performed only once,and the plate then placed in a correct and satisfactory position.Operation time,incision length,wrist pain score,upper extremity function disabilities of the arm,shoulder and hand(DASH)score,wrist Gartland-Werley score,wrist grip strength,and range of motion were among the quantitative variables recorded.Qualitative variables including AO fracture classification,intraoperative and postoperative complications were evaluated.RESULTS At a mean follow-up of 6.9±0.8 months,the mean scar length was 25.4±1.5 mm,the pain score was 0.7±0.6,the DASH score for the upper limb was 4.7±1.3,and the Gartland-Werley score for wrist function was 4.1±1.1 at the last follow-up.Mean flexion was 97.3%,extension was 97.0%,pronation was 98.9%,supination was 98.9%,and grip strength was 86.6%compared to contralateral values.No unfavorable intraoperative or postoperative complications occurred.CONCLUSION The 3-point positioning technique may reduce the damage to the PQ muscle and is a safe and effective method for MIPO for distal radius fractures.
文摘随着全球导航卫星系统技术的发展,广播星历精度逐渐提升,为基于广播星历实现的精密单点定位(precise point position with broadcast ephemerides, BE-PPP)带来了希望。本文基于2022年6月至2023年11月的BDS-3广播星历分析了其误差特性,并基于此改正相应误差实现BDS-3 BE-PPP。根据实验结果,本文首次发现BDS-3广播和精密轨道间的赫尔默特旋转参数在2023年8月逐渐减小,这也改善了赫尔默特七参数的根和平方(root-sum-square,RSS)。2023年9月、10月和11月的RSS平均值分别为5.16 cm、5.51 cm和5.12 cm,明显优于其余月份。通过修正BDS-3广播轨道Z向年周期平移误差和引入广播星历视线方向综合误差参数进行BE-PPP数据处理,2月的静态和仿动态的三维定位精度分别为32.6 cm和52.5 cm;11月使用精度提升的BDS-3广播星历的静态和仿动态的三维定位精度分别为26.6cm和43.5cm,相比2月,分别提升了18.4%和15.5%。
