Department of Orthopedics and Traumatology, Faculty of Medical Sciences in Katowice, Medical University of Silesia, Katowice, Poland.
Institute of Sport, Department of Human Motor Behaviour, The Jerzy Kukuczka Academy of Physical Education, Katowice, Poland.
Acta Bioeng Biomech. 2021;23(1):187-195.
The clinical outcomes of total hip arthroplasty are influenced by the correct muscle function that determines good, longterm and proper function of the artificial joint. The aim of the study was to analyze the electromyographic activity of the gluteus medius muscle in patients with hip osteoarthritis and after arthroplasty in various static weight bearing conditions, both on the affected and contralateral side.
The prospective study involved 70 patients qualified for hip replacement. Patients underwent a surface electromyography of the gluteus medius muscle which involved the Trendelenburg test. The normalized results were obtained for both hips, preoperatively and 6 months after arthroplasty.
The only muscle activity differences were found at a full load condition of lower limb. In the preoperative assessment, the activity of the gluteus medius muscle was greater on the side qualified for surgery. After arthroplasty and the rehabilitation period, the muscle activity on the operated side decreased and significantly increased on the contralateral side. Detailed analysis of the contralateral side revealed relationship with osteoarthritis. Previous hip arthroplasty of that side resulted in lower muscle activity, similar to fully functional joints.
The activity characteristics of the gluteus medius muscle vary depending on the condition of the joint, and the characteristics change as a result of the surgical procedure performed on both the operated and contralateral sides. These dependencies should be taken into account in the rehabilitation process, especially at the side opposite to the operated one.
全髋关节置换术的临床效果受肌肉功能的影响，肌肉功能决定了人工关节的良好、长期和适当功能。本研究旨在分析髋关节骨关节炎患者和髋关节置换术后不同静态负重条件下（患侧和健侧）臀中肌的肌电图活动。
本前瞻性研究纳入了 70 名符合髋关节置换条件的患者。患者接受臀中肌表面肌电图检查，包括特伦德伦堡试验。分别对术前和术后 6 个月的双侧髋关节进行标准化结果分析。
仅在下肢完全负重条件下发现肌肉活动存在差异。在术前评估中，拟手术侧臀中肌的活动较大。髋关节置换和康复期后，患侧肌肉活动减少，对侧肌肉活动明显增加。对侧肌肉活动的详细分析显示与骨关节炎有关。该侧先前的髋关节置换导致肌肉活动减少，类似于功能正常的关节。
臀中肌的活动特征取决于关节状况，手术对患侧和健侧关节的影响会导致特征发生变化。这些相关性应在康复过程中考虑，尤其是在与手术侧相反的一侧。
