title: Age-related changes in kinematics of the knee joint during deep squat.
abstract: Researchers frequently use the deep knee squat as a motor task in order to evaluate the kinematic performance after total knee arthroplasty. Many authors reported about the kinematics of a normal squatting motion, however, little is known on what the influence of aging is. Twenty-two healthy volunteers in various age groups (range 21-75 years) performed a deep knee squat activity while undergoing motion analysis using an optical tracking system. The influence of aging was evaluated with respect to kinematics of the trunk, hip, knee and ankle joints. Older subjects required significantly more time to perform a deep squat, especially during the descending phase. They also had more knee abduction and delayed peak knee flexion. Older subjects were slower in descend than ascend during the squat. Although older subjects had a trend towards less maximal flexion and less internal rotation of the knee compared to younger subjects, this difference was not significant. Older subjects also showed a trend towards more forward leaning of the trunk, resulting in increased hip flexion and anterior thoracic tilt. This study confirmed that some aspects of squat kinematics vary significantly with age, and that the basic methodology employed here can successfully detect these age-related trends. Older subjects had more abduction of the knee joint, and this may indicate the load distribution of the medial and lateral condyles could be different amongst ages. Age-matched control data are therefore required whenever the performance of an implant is evaluated during a deep knee squat.
authors.affiliation: Department of Orthopaedics, University Hospitals Leuven, Katholieke Universiteit Leuven, Weligerveld 1, 3212 Pellenberg, Belgium. shingo_fukagawa@hotmail.com
authors.forename: Shingo
authors.initials: S
authors.lastname: Fukagawa
authors.forename: Alberto
authors.initials: A
authors.lastname: Leardini
authors.forename: Barbara
authors.initials: B
authors.lastname: Callewaert
authors.forename: Pius D
authors.initials: PD
authors.lastname: Wong
authors.forename: Luc
authors.initials: L
authors.lastname: Labey
authors.forename: Kaat
authors.initials: K
authors.lastname: Desloovere
authors.forename: Shuichi
authors.initials: S
authors.lastname: Matsuda
authors.forename: Johan
authors.initials: J
authors.lastname: Bellemans
mesh_terms: D000328:Adult; D000368:Aged; D000375:Aging; D019645:Arthroplasty, Replacement, Knee / Q000379:methods*; D001696:Biomechanical Phenomena; D015444:Exercise / Q000502:physiology*; D005080:Exercise Test / Q000379:methods*; D005260:Female; D006801:Humans; D007719:Knee Joint / Q000503:physiopathology* / Q000601:surgery; D008297:Male; D008875:Middle Aged; D016059:Range of Motion, Articular; D055815:Young Adult