To study the influence of head-neck ratio and implant position on the range of motion (ROM) after total hip arthroplasty (THA).Methods In this study the author established a three-dimensional computerized model of hip...To study the influence of head-neck ratio and implant position on the range of motion (ROM) after total hip arthroplasty (THA).Methods In this study the author established a three-dimensional computerized model of hip joint and tested the range of motion of three different head-neck ratio after total hip arthroplasty.Results Range of motion after total hip arthroplasty depended on design parameters such as head-neck ratio,but also on the implantation parameters such as the cup’s inclination and antevertion,the stem’s antevertion and their combination of each other.Optimal range of motion required compliant position of total hip components.The range of motion increased with the enlarging of head-hnck ratio.Conclusion Higher head-neck ratio leads to optimal range of motion and decreased the prevalence of prosthetic impingement within compliant,well-defined combination of cup’s inclination,cup’s antevertion and stem’s antevertion depending on the intended ROM.Domestic magnesium-silicon jade total hip prosthesis has too low head-neck ratio to result in enough range of motion that fulfilled daily living after total hip arthroplasty.14 refs,4 figs,3 tabs.展开更多
目的探讨经髋关节外科脱位入路股骨颈基底部旋转截骨术治疗国际骨循环研究会(association research circulation osseous,ARCO)分期Ⅱ期股骨头坏死的临床疗效。方法回顾性分析2016年5月至2023年2月唐山市第二医院应用此技术治疗的39例A...目的探讨经髋关节外科脱位入路股骨颈基底部旋转截骨术治疗国际骨循环研究会(association research circulation osseous,ARCO)分期Ⅱ期股骨头坏死的临床疗效。方法回顾性分析2016年5月至2023年2月唐山市第二医院应用此技术治疗的39例ARCOⅡ期股骨头坏死患者资料,其中男34例,女5例;年龄22~41岁,平均(29.40±8.00)岁;ARCOⅡA期11例,ⅡB期19例,ⅡC期9例。手术前后评估患者疼痛视觉模拟评分(visual analogue scale,VAS)、Harris髋关节功能评分;影像学检查评估股骨头缺血坏死情况。结果术后随访14~24个月,平均(20.00±3.00)个月。末次随访时,VAS由术前(4.23±1.17)分降低至(2.31±1.15)分(P<0.05),Harris评分由术前(68.33±9.44)分改善至(85.87±8.63)分(P<0.05)。术后大转子和股骨颈截骨部位均愈合良好,36例(92.3%)股骨头坏死区域稳定或改善。结论经髋关节外科脱位入路股骨颈基底部旋转截骨术治疗ARCOⅡ期股骨头坏死,可充分显露髋关节结构,在不影响股骨头主要血供的情况下改变负重区坏死骨的位置,缓解症状、改善髋关节功能,是一种较好的保髋治疗手段。展开更多
文摘To study the influence of head-neck ratio and implant position on the range of motion (ROM) after total hip arthroplasty (THA).Methods In this study the author established a three-dimensional computerized model of hip joint and tested the range of motion of three different head-neck ratio after total hip arthroplasty.Results Range of motion after total hip arthroplasty depended on design parameters such as head-neck ratio,but also on the implantation parameters such as the cup’s inclination and antevertion,the stem’s antevertion and their combination of each other.Optimal range of motion required compliant position of total hip components.The range of motion increased with the enlarging of head-hnck ratio.Conclusion Higher head-neck ratio leads to optimal range of motion and decreased the prevalence of prosthetic impingement within compliant,well-defined combination of cup’s inclination,cup’s antevertion and stem’s antevertion depending on the intended ROM.Domestic magnesium-silicon jade total hip prosthesis has too low head-neck ratio to result in enough range of motion that fulfilled daily living after total hip arthroplasty.14 refs,4 figs,3 tabs.
