Background:

A trochanteric shoulder is 1 of the characteristics of the original Zweymüller femoral stem for total hip arthroplasty (THA). There have been few clinical reports of THA using recently available versions of Zweymüller-type stems with eliminated trochanteric shoulder.

Methods:

82 consecutive THAs with a Zweymüller-type stem without trochanteric shoulder were analyzed. The stem was made of alkali- and heat-treated titanium, straight, tapered, with rectangular cross-section. Survivorship was estimated with the Kaplan-Meier method.

Results:

76 of 82 hips (92.7%) were followed for more than 5 years or until revision. 35 of 82 hips (42.7%), were revised and the predominant reason for revision was aseptic loosening of the femoral stem (34 of 35 hips, 97.1%). Survival with revision for any reason as the endpoint was 71.3% (95% CI, 51.8% to 80.1%) at 5 years.

Conclusions:

The survival of the modified Zweymüller-type stem with no trochanteric shoulder was unacceptably low.

中文翻译：

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使用经过碱和热处理的钛 Zweymüller 柄进行全髋关节置换术，无转子肩：5 年随访结果

背景：

转子肩部是用于全髋关节置换术 (THA) 的原始 Zweymüller 股骨柄的特征之一。使用最近推出的带有消除转子肩的 Zweymüller 型柄的 THA 临床报告很少。

方法：

对 82 个连续的 THAs 进行了分析，该 THA 具有 Zweymüller 型柄，无转子肩。阀杆由经过碱处理和热处理的钛制成，直形、锥形、矩形横截面。使用 Kaplan-Meier 方法估计存活率。

结果：

82 个髋关节中的 76 个（92.7%）接受了超过 5 年的随访或直至修复。82 髋中的 35 髋（42.7%）进行了翻修，翻修的主要原因是股骨柄无菌性松动（35 髋中的 34 髋，97.1%）。因任何原因进行修正作为终点的 5 年生存率为 71.3%（95% CI，51.8% 至 80.1%）。

结论：

改良的无转子肩部的 Zweymüller 型柄的存活率低得令人无法接受。