Background

Altered gluteus minimus (GMin) activity has been identified in people with hip osteoarthritis (OA) during gait with some evidence of altered gluteus medius (GMed) activity in patients with advanced OA. It is not known whether these muscles also exhibit altered activity during other functional tasks.

Research question

Does gluteal muscle activity during stepping tasks differ between people with hip OA and healthy older adults?

Methods

Participants included 20 people with unilateral hip OA and 20 age-and sex-matched controls. Muscle activity in the three segments within GMed and two segments of GMin were examined using intramuscular electromyography during step-up, step-down and side-step tasks.

Results

Participants in the OA group demonstrated reduced muscle activity early in the step-up task and a later time to peak activity in most muscle segments. Greater activity was identified in anterior GMin in people with hip OA during the side-step task. A delay in time to peak activity was identified in most muscle segments in people with OA during the side-step task.

Significance

For participants with OA, reduced activity in most muscle segments and increased time spent in double limb stance during the step-up task could reflect the decreased strength and pain associated with single limb stance on the affected limb. This study provides further evidence of altered function of the deep gluteal muscles in people with hip OA and highlights the importance of addressing these muscles in rehabilitation.

中文翻译：

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踩踏任务过程中的臀臀肌和小肌活动：髋部骨关节炎患者和相匹配的对照组参与者之间的比较。

背景

在髋部骨关节炎（OA）步态中人们发现了臀小肌（GMin）活性改变，并且有证据表明晚期OA患者中臀肌（GMed）活性改变。尚不清楚这些肌肉在其他功能性任务中是否也表现出改变的活动。

研究问题

髋骨OA患者和健康的老年人在踏步任务中的臀肌活动是否有所不同？

方法

参与者包括20例单侧髋骨关节炎和20例年龄和性别匹配的对照。在升压，降压和回避任务期间，使用肌内肌电图检查了GMed和GMin的两个节段中三个节段的肌肉活动。

结果

OA组的参与者表现出在增强任务的早期肌肉活动减少，而在大多数肌肉节段中达到峰值活动的时间较晚。在进行分步操作时，髋骨OA患者的GMin前部活动增强。在进行跨步任务时，在患有OA的人的大多数肌肉段中发现了达到峰值活动的时间延迟。

意义

对于患有OA的参与者，在升压任务中大多数肌肉节段的活动减少以及在双肢姿势上花费的时间增加，可能反映出与患肢上单肢姿势相关的力量和疼痛的降低。这项研究提供了髋关节炎患者深臀肌功能改变的进一步证据，并强调了在康复中解决这些肌肉的重要性。