AIMS Adverse spinal motion or balance (spine mobility) and adverse pelvic mobility, in combination, are often referred to as adverse spinopelvic mobility (SPM). A stiff lumbar spine, large posterior standing pelvic tilt, and severe sagittal spinal deformity have been identified as risk factors for increased hip instability. Adverse SPM can create functional malposition of the acetabular components and hence is an instability risk. Adverse pelvic mobility is often, but not always, associated with abnormal spinal motion parameters. Dislocation rates for dual-mobility articulations (DMAs) have been reported to be between 0% and 1.1%. The aim of this study was to determine the early survivorship from the Australian Orthopaedic Association National Joint Replacement Registry (AOANJRR) of patients with adverse SPM who received a DMA. METHODS A multicentre study was performed using data from 227 patients undergoing primary total hip arthroplasty (THA), enrolled consecutively. All the patients who had one or more adverse spine or pelvic mobility parameter had a DMA inserted at the time of their surgery. The mean age was 76 years (22 to 93) and 63% were female (n = 145). At a mean of 14 months (5 to 31) postoperatively, the AOANJRR was analyzed for follow-up information. Reasons for revision and types of revision were identified. RESULTS The AOANJRR reported two revisions: one due to infection, and the second due to femoral component loosening. No revisions for dislocation were reported. One patient died with the prosthesis in situ. Kaplan-Meier survival rate was 99.1% (95% confidence interval 98.3 to 100) at 14 months (number at risk 104). CONCLUSION In our cohort of patients undergoing primary THA with one or more factor associated with adverse SPM, DM bearings conferred stability at two years' follow-up. Cite this article: Bone Joint J 2022;104-B(7):820-825.

中文翻译：

---

脊柱骨盆活动不良患者的模块化双活动关节。

AIMS 不利的脊柱运动或平衡（脊柱活动性）和不利的骨盆活动性通常被称为不利的脊柱骨盆活动性（SPM）。僵硬的腰椎、大的后站立骨盆倾斜和严重的矢状脊柱畸形已被确定为髋关节不稳定增加的危险因素。不良 SPM 会造成髋臼组件的功能性错位，因此存在不稳定风险。不利的骨盆活动度通常（但并非总是）与异常的脊柱运动参数相关。据报道，双活动关节 (DMA) 的脱位率在 0% 到 1.1% 之间。本研究的目的是确定澳大利亚骨科协会国家关节置换登记处 (AOANJRR) 接受 DMA 的不良 SPM 患者的早期存活率。方法 使用来自 227 名接受初次全髋关节置换术 (THA) 的患者的数据进行了一项多中心研究，这些患者连续入组。所有具有一项或多项不良脊柱或骨盆活动度参数的患者在手术时都插入了 DMA。平均年龄为 76 岁（22 至 93 岁），63% 为女性（n = 145）。在术后平均 14 个月（5 至 31 个月）时，分析了 AOANJRR 的随访信息。确定了修订的原因和修订类型。结果 AOANJRR 报告了两次修订：一次是由于感染，另一次是由于股骨假体松动。没有报告脱位的修正。一名患者死于原位假肢。14 个月时 Kaplan-Meier 生存率为 99.1%（95% 置信区间为 98.3 至 100）（有风险的人数为 104）。结论 在我们接受原发性 THA 且有一个或多个因素与不良 SPM 相关的患者队列中，DM 轴承在两年的随访中具有稳定性。引用这篇文章：骨关节 J 2022;104-B(7):820-825。