title: Change in knee kinematics during gait after eccentric isokinetic training for quadriceps in subjects submitted to anterior cruciate ligament reconstruction.
abstract: Knee kinematics after anterior cruciate ligament (ACL) reconstruction is of interest in studies evaluating the effect of training programs. Many studies have addressed knee flexion/extension but not valgus/varus movements. Considering that joint stability is a major concern in ACL reconstruction surgery, movements occurring in the frontal plane of the knee also deserve attention. Knee extensor torque was analyzed by an isokinetic dynamometer and the angular amplitudes and velocities of flexion/extension and valgus/varus movements were analyzed by goniometry during gait 9 months after ACL reconstruction. The analysis was repeated after 3 months of eccentric isokinetic training of the quadriceps in five patients. The gait pattern was also recorded for 10 healthy controls. The knee extensor torque and flexion/extension range of movement during gait increased significantly after training. However, an unexpectedly increased valgus, most pronounced during the swing phase, which may imply adverse effects on the knee, was also observed in the ACL reconstructed knee. The recorded valgus angles may however be overestimated due to crosstalk. Thus, the extent of the increased valgus, as well as the mechanisms involved and the functional and clinical implications, need clarification before eccentric training after ACL reconstruction can be generally recommended.
authors.affiliation: Department of Physical Therapy, Universidade Federal de São Carlos, Km 235, CP 676, CEP 13565-905, São Carlos, SP, Brazil. helenice@power.ufscar.br
authors.forename: H J C G
authors.initials: HJ
authors.lastname: Coury
authors.forename: J S
authors.initials: JS
authors.lastname: Brasileiro
authors.forename: T F
authors.initials: TF
authors.lastname: Salvini
authors.forename: P R
authors.initials: PR
authors.lastname: Poletto
authors.forename: L
authors.initials: L
authors.lastname: Carnaz
authors.forename: G A
authors.initials: GA
authors.lastname: Hansson
mesh_terms: D000328:Adult; D016118:Anterior Cruciate Ligament / Q000601:surgery*; D000070598:Anterior Cruciate Ligament Injuries; D001696:Biomechanical Phenomena; D005684:Gait / Q000502:physiology*; D006801:Humans; D007718:Knee Injuries / Q000503:physiopathology / Q000534:rehabilitation / Q000601:surgery*; D007719:Knee Joint / Q000503:physiopathology* / Q000601:surgery*; D008297:Male; D052097:Quadriceps Muscle / Q000502:physiology*; D019651:Plastic Surgery Procedures; D019415:Torque