title: Dynamic analysis of the resultant force acting on the hip joint during level walking.
abstract: The present study was designed to determine the resultant force acting on the hip joint during walking using a new dynamic analysis method. Our model utilized joint motion, ground reaction force, and muscle strength data from 18 women (6 normal women aged 20-24 years, 6 normal women aged 50-57 years, and 6 female patients with osteoarthritis, aged 50-66 years). We analyzed the resultant force using the multibody dynamic analysis system. To determine the factors that influence the force acting on the hip, we examined the effect of age and total hip arthroplasty. The maximum resultant force acting on the femoral head was dependent on the subject body weight and correlated with muscle strength and walking speed. The results of this study highlight the agreement between computer simulation analysis and actual measurement of the resultant force acting on the hip. Our results suggest that muscle strength and walking speed are significant determinants of the resultant force acting on the hip.
authors.affiliation: Division of Orthopaedics and Rehabilitation Medicine, Department of Surgery, University of Fukui Faculty of Medicine, Matsuoka, Fukui, Japan. nhassy@fmsrsa.fukui-med.ac.jp
authors.forename: Naoki
authors.initials: N
authors.lastname: Hashimoto
authors.forename: Masao
authors.initials: M
authors.lastname: Ando
authors.forename: Takafumi
authors.initials: T
authors.lastname: Yayama
authors.forename: Kenzo
authors.initials: K
authors.lastname: Uchida
authors.forename: Shigeru
authors.initials: S
authors.lastname: Kobayashi
authors.forename: Kohei
authors.initials: K
authors.lastname: Negoro
authors.forename: Hisatoshi
authors.initials: H
authors.lastname: Baba
mesh_terms: D000328:Adult; D000368:Aged; D019644:Arthroplasty, Replacement, Hip; D003198:Computer Simulation; D005260:Female; D006621:Hip Joint / Q000502:physiology* / Q000503:physiopathology; D006801:Humans; D008875:Middle Aged; D015207:Osteoarthritis, Hip / Q000503:physiopathology* / Q000601:surgery; D011182:Postoperative Care; D016896:Treatment Outcome; D016138:Walking / Q000502:physiology*