Division of Orthopaedics and Trauma Surgery, University Hospitals of Geneva, Geneva, Switzerland.
J Arthroplasty. 2011 Dec;26(8):1305-9. doi: 10.1016/j.arth.2010.11.015. Epub 2011 Mar 16.
We evaluated the relationship between cup diameter and dislocation risk in patients undergoing primary total hip arthroplasty (THA) with a 28-mm head. There were 50 dislocations, 28 of which occurred in 2221 (1.3%) THAs with a cup diameter smaller than 56 mm and 22 in 513 (4.3%) with a cup diameter of 56 mm or larger. Dislocation risk varied between 0.6% and 2.4% in the smaller cup group and between 4.1% and 5.2% in the larger cup group. The risk was substantially higher in the large cup group (unadjusted odds ratio, 3.5; 95% confidence interval, 2.0-6.2). Multivariable logistic regression revealed an adjusted odds ratio of 2.4 (95% confidence interval, 1.2-4.9). Patients with THA (28-mm head) had more than twice the risk of dislocation with cup size of 56 mm or higher compared to patients with smaller cups.
我们评估了在接受 28 毫米头的初次全髋关节置换术（THA）的患者中，杯直径与脱位风险之间的关系。共有 50 例脱位，其中 28 例发生在 2221 例（1.3%）杯直径小于 56 毫米的 THA 中，22 例发生在 513 例（4.3%）杯直径为 56 毫米或更大的 THA 中。较小杯组的脱位风险在 0.6%至 2.4%之间，而较大杯组的脱位风险在 4.1%至 5.2%之间。大杯组的风险明显更高（未调整的优势比，3.5；95%置信区间，2.0-6.2）。多变量逻辑回归显示调整后的优势比为 2.4（95%置信区间，1.2-4.9）。与使用较小杯的患者相比，杯径为 56 毫米或更大的 THA 患者脱位的风险高出两倍以上。
