Effect of alteration in hip joint alignment following total hip arthroplasty on hip joint contact force during gait
Abstract
Purpose: Investigation of the relationship between changes in hip-joint center and hip loading pre- and post-total hip arthroplasty (THA) is important in evaluating the effect of surgery on motor function. However, few longitudinal studies comparing pre- and post-THA have been reported. The purpose of this study was to determine the effect of changes in hip-joint center pre- and post-THA on the magnitude and direction of hip-joint contact force during the gait cycle, using a patient-specific musculoskeletal model.
Methods: The simulation program AnyBody was used to create musculoskeletal models incorporating patient specific hip-joint shape and hip-joint center position for 17 patients. The relationship between the displacement distance of the hip-joint center and the amount of change in hip-joint contact force was examined by correlation analysis.
Results: A decrease in the medial force ( p ≤ 0.049) and an increase in the anterior force ( p ≤ 0.001) acting on the hip joint were observed during gait post-THA compared to pre-THA. Mediolateral displacement of the hip-joint center post-THA compared to pre-THA was significantly positively correlated with the difference in anterior hip-joint contact force, and negatively to hip-joint medial contact force.
Conclusions: Longitudinal observations revealed the effects of change in hip-joint center position induced by THA on the hip-joint contact force during gait. Therefore, the change of hip-joint center position during THA can be an important factor for estimating the improvement of motor function following THA.
© 2024 Kazutaka Hata, Yasuhiro Ishido, Kiyohiro Fukudome, Ryoji Kiyama, Masayuki Kawada, Tomohiro Nishi, Shintaro Nakatsuji, Kazunori Yone, published by Wroclaw University of Science and Technology
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