title: Thigh muscle activity and anterior cruciate ligament insufficiency.
abstract: The purpose of this study was to examine the dynamic relationship between the quadriceps femoris and hamstrings in anterior cruciate ligament (ACL) insufficiency. Thirty-five young active patients with an untreated complete tear of the ACL took part in the study. Using a KINCOM isokinetic dynamometer, the dynamic capacity of each muscle group at 30° in concentric and eccentric exertion in both the deficient and sound knee was measured. Findings demonstrated a significant reduction (P<0.05) in the torque produced by the deficient-side quadriceps compared to the sound side but no significant variations in the hamstring torque. Discussion of the findings considers a possible involvement of neurophysiological inhibition of the quadriceps as a cause for the observed weakness.
authors.affiliation: Department of Physical Therapy, Sackler School of Medicine, Tel-Aviv University, Israel.
authors.forename: Z
authors.initials: Z
authors.lastname: Dvir
authors.forename: G
authors.initials: G
authors.lastname: Eger
authors.forename: N
authors.initials: N
authors.lastname: Halperin
authors.forename: A
authors.initials: A
authors.lastname: Shklar