title: Knee adduction moment and medial knee contact force during gait in older people.
abstract: External knee adduction moment has been studied as a surrogate for medial knee contact force. However, it is not known whether adduction moment is a rational measure for predicting medial knee contact force. The aim of this study was to investigate the correlation between knee adduction moment and medial knee contact force in older people, using musculo-skeletal simulation analysis. One hundred and twenty-two healthy older subjects participated in this study. Knee moment and medial knee contact force were calculated based on inverse dynamics analysis of normal walking. Muscle force and joint reaction force were used to determine the medial knee contact force during stance phase. The results showed that the maximum medial knee contact force was moderately correlated to the maximum knee adduction (r = 0.59) as well as the maximum extension moment (r = 0.60). The first peak of medial knee contact force had a significant strong correlation with the first peak of adduction moment and a moderate correlation with the maximum flexion moment. The second peak of medial knee contact force had a significant moderate correlation with both the second peak of adduction and the maximum extension moment. These results implied that the maximum adduction moment value could be used, to some extent, as a measure of the maximum medial knee contact force.
authors.affiliation: Division of Physical Therapy, Department of Comprehensive Rehabilitation, Osaka Prefecture University, 3-7-30 Habikino, Habikino-shi, Osaka 583-8555, Japan; Division of Bioengineering, Department of Mechanical Science and Bioengineering, Graduate School of Engineering Science, Osaka University, 1-3 Machikaneyama, Toyonaka, Osaka 560-8531, Japan. Electronic address: ogaya@rehab.osakafu-u.ac.jp.
authors.forename: Shinya
authors.initials: S
authors.lastname: Ogaya
authors.affiliation: Division of Bioengineering, Department of Mechanical Science and Bioengineering, Graduate School of Engineering Science, Osaka University, 1-3 Machikaneyama, Toyonaka, Osaka 560-8531, Japan.
authors.forename: Hisashi
authors.initials: H
authors.lastname: Naito
authors.affiliation: Division of Physical Therapy, Department of Comprehensive Rehabilitation, Osaka Prefecture University, 3-7-30 Habikino, Habikino-shi, Osaka 583-8555, Japan.
authors.forename: Akira
authors.initials: A
authors.lastname: Iwata
authors.affiliation: Division of Physical Therapy, Department of Comprehensive Rehabilitation, Osaka Prefecture University, 3-7-30 Habikino, Habikino-shi, Osaka 583-8555, Japan.
authors.forename: Yumi
authors.initials: Y
authors.lastname: Higuchi
authors.affiliation: Division of Physical Therapy, Department of Comprehensive Rehabilitation, Osaka Prefecture University, 3-7-30 Habikino, Habikino-shi, Osaka 583-8555, Japan.
authors.forename: Satoshi
authors.initials: S
authors.lastname: Fuchioka
authors.affiliation: Division of Bioengineering, Department of Mechanical Science and Bioengineering, Graduate School of Engineering Science, Osaka University, 1-3 Machikaneyama, Toyonaka, Osaka 560-8531, Japan.
authors.forename: Masao
authors.initials: M
authors.lastname: Tanaka
mesh_terms: D000368:Aged; D001696:Biomechanical Phenomena / Q000502:physiology; D005260:Female; D005684:Gait / Q000502:physiology*; D006801:Humans; D007719:Knee Joint / Q000502:physiology*; D008297:Male; D008953:Models, Anatomic; D016059:Range of Motion, Articular / Q000502:physiology*; D016138:Walking / Q000502:physiology
keywords: Adduction moment; Gait; Medial knee contact force; Older people; Simulation