Association between stem bypass and union failure of subtrochanteric shortening osteotomy in total hip arthroplasty for high hip dislocations

Kazuya Makida, Taisuke Seki, Yasuhiko Takegami, Yusuke Osawa, Shiro Imagama
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Abstract

Purpose

Clinical evidence of risk factors for union failure at osteotomy sites after total hip arthroplasty (THA) using subtrochanteric shortening osteotomy (SSO) in patients with high hip dislocations is limited because of the rarity of this dislocation type. The aim of this study was to identify the factors influencing bone union at osteotomy sites in patients with high hip dislocations undergoing this procedure.

Methods

This retrospective, case-control study included a total of 28 hips of 24 patients with high hip dislocations who had undergone THA using SSO at a single institution from 1993 to 2018. Fourteen hips were categorized into the union-failure group at 6 months after surgery and compared with a control group including the other 14 hips. We compared various demographic, clinical, and radiological characteristics between the two groups, including age, sex, body mass index, cement usage of stem, stem bypass characteristics, clinical evaluations, and implant survival.

Results

The union-failure group had inferior results for clinical evaluations and implant survival. Multivariable analysis found that the stem bypass ratio was significantly shorter in the union-failure group than in the control group (48 vs 64%; odds ratio, 1.18; 95% confidence interval, 1.02 to 1.38; p ​= ​.028).

Conclusion

Our results demonstrated that shorter stem bypasses were related to union failure at osteotomy sites in patients with high hip dislocations who underwent THA using SSO. We recommend that the femoral stem be inserted more than 50% of the stem length below the osteotomy site, especially for cemented THA.

全髋关节置换术中股骨粗隆下缩短截骨术治疗高位髋关节脱位合并失败与干细胞搭桥术的关系
目的应用转子下缩短截骨行全髋关节置换术(THA)治疗高位髋关节脱位后截骨处愈合失败的危险因素的临床证据有限,因为这种类型的脱位很少见。本研究的目的是确定影响接受该手术的高位髋关节脱位患者截骨部位骨愈合的因素。方法本回顾性病例对照研究包括1993年至2018年在一家机构使用SSO进行THA的24例高位髋关节脱位患者中的28个髋关节。14个髋关节在手术后6个月被分为愈合失败组,并与包括其他14个髋在内的对照组进行比较。我们比较了两组患者的各种人口统计学、临床和放射学特征,包括年龄、性别、体重指数、干细胞水泥使用、干细胞搭桥术特征、临床评估和植入物存活率。结果联合失败组在临床评价和植入物生存率方面的结果较差。多变量分析发现,联合失败组的干细胞搭桥率明显低于对照组(48%对64%;比值比,1.18;95%置信区间,1.02-1.38;p​=​.028)。结论我们的研究结果表明,在使用SSO进行THA的高位髋关节脱位患者中,较短的股骨干旁路与截骨部位的愈合失败有关。我们建议将股骨柄插入截骨部位下方超过股骨柄长度的50%,尤其是对于骨水泥THA。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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