The Influence of the Postural Change and the using Cane on Hip Joint Force during One Foot Standing : The Calculation of the Center of Mass by using the Three-Dimensional Motion Analysis System

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  • 片脚立位時の股関節骨頭合力に対する姿勢変化と杖の影響 : 三次元運動解析装置による体重心の算出

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Knowledge of hip joint force is indispensable for orthopedic treatment and physical therapy for patients with hip joint osteoarthritis. In this research, changes of hip joint forces in the cases of Trendelenburg's phenomenon and Duchenne's phenomenon were studied. The resulting values for one foot standing both with or without canes were compared and analyzed. Pauwels model was used in the calculation hip joint forces. Pauwels didn't take into consideration the center of mass movement during postural change. In this research, changes in mass centers measured by using the three-dimensional motion analysis system. These measurements were then used to calculated the hip joint forces. As a result, the hip joint forces during one foot standing cases of Trendelenburg's phenomenon, Duchenne's phenomenon and with canes maximum of load were 2.97, 3.10, 1.17 and 0.58 times the body weight, respectively. These results suggest that trunk lateral bending relieves hip joint forces in one foot standing and using of cane is effective in for hip joint forces reduction. The hip joint force measurements in this research were consistent with the past study of direct in vivo hip pressure. Itis suggested that the hip joint forces could be calculated accurately by indirect mass center measurements.

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