title: Asymmetries in joint work during multi-joint movement after anterior cruciate ligament reconstruction: a pilot study.
abstract: After anterior cruciate ligament reconstruction (ACL-R), many studies have reported a deficit of performance on the injured leg during multi-joint tasks. However, the total mechanical joint work (WTotal ), parameter best related to the vertical displacement of the body mass center during vertical jumping, has not yet been studied. The aim of this research was to compare asymmetries between ACL-R subjects and healthy matched subjects, through the analysis of the kinematics and kinetics during a single-leg squat jump. Asymmetries are defined by the Limb Symmetry Index (LSI). A greater LSI was observed for WTotal in the ACL-R group than in the healthy group. There was no difference in LSI for knee joint work between the two groups, while the LSI for hip and ankle joint work was significantly larger in the ACL-R group. This was explained by greater LSI for the hip and ankle joint range of motion in the ACL-R group than in the healthy group. After ACL-R, patients exhibited greater asymmetries than healthy subjects during single-leg squat jump. Physiotherapists should focus on quality execution of multi-joint movement, especially on hip and ankle joints range of motion in order to reduce asymmetries and to improve vertical jumping performance.
authors.affiliation: Centre de Recherche et d'Innovation sur le Sport, équipe Performance Motrice, Mentale et du Matériel, Université de Lyon, Université Claude Bernard Lyon 1, Villeurbanne, France.
authors.forename: B
authors.initials: B
authors.lastname: Pairot de Fontenay
authors.forename: S
authors.initials: S
authors.lastname: Argaud
authors.forename: Y
authors.initials: Y
authors.lastname: Blache
authors.forename: K
authors.initials: K
authors.lastname: Monteil
mesh_terms: D000293:Adolescent; D000328:Adult; D000843:Ankle Joint / Q000502:physiology*; D059549:Anterior Cruciate Ligament Reconstruction / Q000534:rehabilitation; D001696:Biomechanical Phenomena; D016022:Case-Control Studies; D005080:Exercise Test; D064368:Healthy Volunteers; D006621:Hip Joint / Q000502:physiology*; D006801:Humans; D007700:Kinetics; D007719:Knee Joint / Q000502:physiology*; D008297:Male; D009068:Movement / Q000502:physiology*; D010865:Pilot Projects; D016059:Range of Motion, Articular; D055815:Young Adult
keywords: Knee; dynamic movement; imbalances; rehabilitation; vertical jump