Saliba Thomas, Pather Sanjiva
Hôpital de Braine L'Alleud, Rue Wayez 35, 1420 Braine-l'Alleud, Belgium.
J Belg Soc Radiol. 2025 Jul 17;109(1):29. doi: 10.5334/jbsr.3862. eCollection 2025.
Glenoid component migration is a serious complication in total shoulder arthroplasty, causing 32% of failures and 7% of revisions. Detecting polyethylene loosening is challenging due to its radiolucency. We report a case of a 72-year-old woman with shoulder pain three years post-arthroplasty. Initial radiographs were unremarkable, but CT-arthrography revealed a displaced polyethylene spacer, rotated 90°, thus causing a mechanical block. Retrospective analysis of the X-rays showed the absence of the spacer in the expected position. Surgery restored functionality. This case highlights the diagnostic challenges of radiotransparent components with possible migration in unexplained post-arthroplasty shoulder pain. Verify glenoid component positioning in shoulder arthroplasties.
关节盂部件移位是全肩关节置换术中一种严重的并发症，导致32%的手术失败和7%的翻修手术。由于聚乙烯的射线可透性，检测其松动具有挑战性。我们报告一例72岁女性患者，在关节置换术后三年出现肩部疼痛。最初的X线片未见异常，但CT关节造影显示一个聚乙烯垫片移位，旋转了90°，从而造成机械性阻挡。对X线片的回顾性分析显示预期位置没有垫片。手术恢复了功能。该病例突出了对于在不明原因的关节置换术后肩部疼痛中可能发生移位的射线可透部件的诊断挑战。在肩关节置换术中需确认关节盂部件的位置。
