Manafi Rasi Alireza, Zandi Reza, Qoreishi Mohamad, Habibollahzadeh Ali
Department of Orthopedic Surgery, Imam Hossein Hospital, Shahid Beheshti University of Medical Science, Tehran, Iran.
Department of Orthopedic Surgery, Taleghani Hospital, Shahid Beheshti University of Medical Science, Tehran, Iran.
Arch Bone Jt Surg. 2020 Jan;8(1):83-88. doi: 10.22038/abjs.2019.38549.2020.
Surgical techniques and rehabilitations after total hip arthroplasty (THA) play a significant role in the improvement of pain and limping. This study aimed to assess hip abductor muscle's diameter and its strength after 6 months postoperative THA performed by Hardinge approach.
After obtaining the patients' demographic characteristics, the preoperative values of patients' hip abductor muscle diameter were measured using magnetic resonance imaging, and were compared with postoperative values 6 months later. Moreover, the hip abductor muscle's strength was assessed using the Trendelenburg test.
A total of 88 patients participated in this study with a mean age of 47.3±1.574 years. It should be noted that 55.7% of the participants were male. Muscle diameter decreased from a mean value of 27.07±7.485 preoperative to mean value of 25.64±7.353 mm postoperative (). Moreover, the degrees of Trendelenburg test (i.e., mild or severe) decreased after surgery (). There was no significant difference between the frequencies of different grades of limping according to the studied variables.
A decrease was observed in gluteus medius muscle diameter, and the Trendelenburg test results were improved in this study. Moreover, the difference between pre- and postoperative gluteus medius muscle diameters were measured using MRI. It can be concluded that MRI is not an appropriate diagnostic tool for the assessment of abductor strength after THA in the 6-month postoperative visit. Accordingly, it is suggested to evaluate muscle strength before and after each surgery to schedule the following treatment protocol required for each patient.
全髋关节置换术（THA）后的手术技术和康复在改善疼痛和跛行方面起着重要作用。本研究旨在评估采用Hardinge入路进行THA术后6个月时髋外展肌的直径及其力量。
获取患者的人口统计学特征后，使用磁共振成像测量患者术前髋外展肌直径的数值，并与6个月后的术后数值进行比较。此外，采用单足站立试验评估髋外展肌的力量。
共有88例患者参与本研究，平均年龄为47.3±1.574岁。需要注意的是，55.7%的参与者为男性。肌肉直径从术前的平均值27.07±7.485减小至术后的平均值25.64±7.353毫米（）。此外，术后单足站立试验的程度（即轻度或重度）有所降低（）。根据所研究的变量，不同程度跛行的频率之间没有显著差异。
本研究中观察到臀中肌直径减小，单足站立试验结果得到改善。此外，使用MRI测量了术前和术后臀中肌直径的差异。可以得出结论，在术后6个月的随访中，MRI不是评估THA后外展肌力量的合适诊断工具。因此，建议在每次手术前后评估肌肉力量，以便为每位患者制定后续所需的治疗方案。
