Mechanical impingement of the iliopsoas (IP) tendon accounts for 2% to 6% of persistent postoperative pain after total hip arthroplasty (THA). The most common initiator is anterior acetabular component protrusion, where the anterior margin is not covered by anterior acetabular wall. A CT scan can be used to identify and measure this overhang; however, no threshold exists for determining symptomatic anterior IP impingement due to overhang. A case-control study was conducted in which CT scan measurements were used to define a threshold that differentiates patients with IP impingement from asymptomatic patients after THA.

中文翻译：

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髋臼组件前悬的阈值与全髋关节置换术后症状性髂腰肌撞击相关。

髂腰肌 (IP) 肌腱的机械撞击占全髋关节置换术 (THA) 术后持续性术后疼痛的 2% 至 6%。最常见的引发因素是髋臼前壁突出，其中前缘不被髋臼前壁覆盖。CT 扫描可用于识别和测量该突出部分；然而，没有阈值来确定由于悬垂引起的有症状的前IP撞击。进行了一项病例对照研究，其中使用 CT 扫描测量来定义区分 THA 后出现 IP 撞击的患者和无症状患者的阈值。