Background

Hip abductor weakness due to the progression of hip osteoarthritis (OA) commonly causes poor functional mobility. The hip abductor strength has also been identified as a clinically relevant factor for successful functional outcomes after total hip arthroplasty.

Objectives

This study aimed to examine the functional characteristics related to hip abductor torque in patients with hip OA.

Design

A cross-sectional survey study.

Methods

One hundred and eight female patients with severe unilateral hip OA participated in this study. Hip abductor torque and pain were measured. The muscle cross-sectional area (CSA) and skeletal muscle density (SMD) of the gluteal muscles were also measured using computed tomography. To identify the hip parameters associated with hip abductor torque, multiple regression analysis was performed. The healthy model included the CSA and SMD of gluteus maximus, gluteus medius, and gluteus minimus; range of motion in hip abduction; age; and body mass index. The affected model included hip pain in addition to the healthy model.

Results

In the affected limb, multiple regression analysis identified pain and angle of hip abduction as factors that determine hip abductor torque (Adjusted R² = 0.39). In contrast, our analysis identified CSA and SMD of the gluteus medius and SMD of the gluteus minimus as the significant variables related to hip abductor torque in the healthy limb (Adjusted R² = 0.40).

Conclusion

The findings of this study indicated that it is necessary to consider that hip pain may inhibit muscle exertion and contraction while training to improve the hip abductor torque in the affected limb.

中文翻译：

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严重髋骨关节炎患者髋外展肌扭矩的相关功能特征

背景

髋关节骨关节炎 (OA) 进展导致的髋外展肌无力通常会导致功能活动性差。髋外展肌力量也已被确定为全髋关节置换术后成功功能结果的临床相关因素。

目标

本研究旨在检查髋关节 OA 患者与髋外展肌扭矩相关的功能特征。

设计

一项横断面调查研究。

方法

108 名患有严重单侧髋关节 OA 的女性患者参加了这项研究。测量髋外展肌扭矩和疼痛。还使用计算机断层扫描测量了臀肌的肌肉横截面积 (CSA) 和骨骼肌密度 (SMD)。为了确定与髋外展肌扭矩相关的髋参数，进行了多元回归分析。健康模型包括臀大肌、臀中肌和臀小肌的CSA和SMD；髋关节外展的运动范围；年龄; 和体重指数。除了健康模型之外，受影响的模型还包括髋部疼痛。

结果

在受影响的肢体中，多元回归分析将疼痛和髋外展角度确定为决定髋外展肌扭矩的因素（调整后的 R ²  = 0.39）。相比之下，我们的分析将臀中肌的 CSA 和 SMD 以及臀小肌的 SMD 确定为与健康肢体的髋外展肌扭矩相关的重要变量（调整后的 R ²  = 0.40）。

结论

这项研究的结果表明，有必要考虑髋部疼痛可能会抑制肌肉在训练中的运动和收缩，以改善受影响肢体的髋外展肌扭矩。