Background Despite recent advances in surgical treatment of dysplastic coxarthrosis, muscular dysfunction of the affected extremity and attempts to improve its functional capacity represent a significant problem. Materials and Methods A prospective case‐match study of 50 patients with severe dysplastic coxarthrosis was conducted. Initially, at 3 and 6 months, all patients were evaluated with handheld dynamometry (HHD), surface electromyography (sEMG), and Harris scoring. The study arm consisted of 25 patients with severe dysplastic coxarthrosis Crowe III‐IV who underwent total hip arthroplasty. The control arm consisted of 25 consecutive patients who underwent conservative treatment due to the refusal of total hip arthroplasty. Results A progressive increase in muscle strength, amplitude, and electrical activity was observed in the study arm. Statistically significant differences were observed for the Harris index in patients in the study arm at 3 and 6 months –65.00 ± 3.69 and 47.00 ± 5.85 points at 3 months and 85.31 ± 1.40 and 44.00 ± 4, 92 points at 6 months, respectively. Total hip arthroplasty was found to be a significant prognostic factor for functional recovery of the muscles of the lower extremities ( p = 0.034, RR – 2.287, CI: 0.023 – 9.301). Conclusions The results of our study suggest that total hip arthroplasty in patients with severe dysplastic coxarthrosis was associated with increased muscular strength, amplitude of the bioelectrical potential, and physical activity of the hip muscles. These findings could have a significant beneficial impact on the improvement of functional recovery in this category of patients.
Полулях et al. (Thu,) studied this question.