Journal of Ergonomics
Open Access
ISSN: 2165-7556
+44 1300 500008
ISSN: 2165-7556
+44 1300 500008
Takuma Inai
Institute for Human Movement and Medical Science,
1398 Shimami-cho, Kita-ku, Niigata City, Niigata 950-3198
Japan
Research Article
Relationship between Hip Flexion Contracture and Hip-Joint Contact
Force in Standing Posture: A Computer Simulation Study
Author(s): Takuma Inai, Mutsuaki Edama, Tomoya Takabayashi and Masayoshi KuboTakuma Inai, Mutsuaki Edama, Tomoya Takabayashi and Masayoshi Kubo
Mechanical stress on articular cartilage and long-duration standing postures are risk factors for hip osteoarthritis progression. This study aims to examine the relationship between hip flexion contracture and the hip-joint contact force in standing postures using computer simulation. A musculoskeletal model composed of seven segments (Head, Arms, and Trunk (HAT) and thighs, shanks, and two feet) was created. Various standing postures (708 variations) were generated, and five hip flexion contracture conditions were set: zero contracture and flexions of 0°, 10°, 20°, and 30°. A standing posture satisfying the hip flexion contracture condition with the minimum sum of the muscle activations was obtained as the optimal standing posture, and the hip-joint contact force in the optimal standing posture was calculated. A sensitivity analysis was conducted by varying four param.. View More»
DOI:
10.4172/2165-7556.1000194