Department of Pharmacy and Biomedical Sciences, College of Science, Health and Engineering, La Trobe University, Victoria, Australia; Sport, Exercise and Rehabilitation Research Focus Area, La Trobe University, Victoria, Australia.
Sport, Exercise and Rehabilitation Research Focus Area, La Trobe University, Victoria, Australia; La Trobe University Sports and Exercise Medicine Research Centre, Victoria, Australia.
Gait Posture. 2020 Jul;80:339-346. doi: 10.1016/j.gaitpost.2020.06.012. Epub 2020 Jun 16.
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.
Does gluteal muscle activity during stepping tasks differ between people with hip OA and healthy older adults?
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.
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.
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.
在髋关节骨关节炎（OA）患者的步态中，已经发现臀小肌（GMin）的活动发生了改变，并且在进展性 OA 患者中，臀中肌（GMed）的活动也发生了改变。目前尚不清楚这些肌肉在其他功能任务中是否也表现出活动改变。
在髋关节 OA 患者和健康老年人中，在台阶任务中，臀肌的活动是否存在差异？
参与者包括 20 名单侧髋关节 OA 患者和 20 名年龄和性别匹配的对照组。在台阶上升、台阶下降和侧步任务中，使用肌内电极记录 GMed 的三个节段和 GMin 的两个节段的肌肉活动。
OA 组的参与者在台阶上升任务的早期表现出肌肉活动减少，并且大多数肌肉节段的峰值活动时间延迟。在侧步任务中，OA 患者的臀小肌前侧段的活动增加。在侧步任务中，OA 患者的大多数肌肉节段的峰值活动时间延迟。
对于 OA 患者来说，在台阶上升任务中，大多数肌肉节段的活动减少，以及在患侧单肢负重时双肢支撑时间增加，这可能反映了与单肢负重相关的力量下降和疼痛。本研究进一步证明了髋关节 OA 患者深部臀肌功能异常，并强调了在康复中解决这些肌肉问题的重要性。
