Objective To explore therapeutic effects of the acetabulum articular capsule incision in total hip replacement by posterior incision.Methods Thirty-one patients of total hip joint replacement who had been treated with the acetabulum articular capsule incision were analyzed retrospectively.The joint capsule and repair success rate of extorsion muscle were observed by MRI 6 months after operation,and the external rotator strength of double lower limbs were compared.The patients were evaluated by harris hip score.Results No dislocation of hip joint was found in all patients..The external rotator strength was no significant difference between affected side and unaffected side(t =1.81, P >0.05).MRI showed external rotation muscles were cured well with good restoration.The "excellent-and-good"rate of Harris hip scores being 96.8%.Conclusion Repair the incised capsule of hip joint along with the rim of acetabulum can prevent the hip joint from dislocation effectively after initial total hip arthroplasty.%目的：探讨老年股骨颈骨折经后路初次全髋关节置换术中自髋臼侧关节囊切开修补的确切性及其对术后早期脱位的影响。方法回顾性分析了31例全髋关节置换术中采用自髋臼侧关节囊切开修补方法的病例，研究修复成功率和其对预防术后关节脱位的作用。术后6个月通过 MRI 观察关节囊及外旋肌群的修复成功率，比较双下肢外旋肌力，并采用 Harris 髋关节评分标准进行评价。结果所有病例未出现髋关节脱位，患侧外旋肌力与健侧比较差异无统计学意义（t ＝1．81，P ＞0．05），MRI 显示外旋肌群修复良好，Harris 髋关节评分优良率96．8％。结论自髋臼侧关节囊切开修补能有效预防术后髋关节脱位的发生。
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