Hamstring and quadriceps strength balance in normal and hamstring anterior cruciate ligament-reconstructed subjects

Clinical Journal of Sport Medicine : Official Journal of the Canadian Academy of Sport Medicine
Laurie A HiemstraDean J Kriellaars

Abstract

The purpose of this study was to evaluate and characterize the agonist-antagonist strength balance (hamstring/quadriceps [H/Q] ratio and dynamic control ratio [DCR]) about the knee specific to velocity, range of motion, and contraction type. We hypothesized that there would be systematic variation in the H/Q ratio and DCR based on knee joint angle, angular velocity, and contraction type. We also hypothesized that these ratios would be altered in the anterior cruciate ligament (ACL)-reconstructed group in favor of protecting the ACL graft (relative knee flexor strength when strain on the ACL is the greatest). Cross-sectional design. A tertiary care sport medicine clinic. Sixteen subjects more than 1 year after hamstring tendon ACL reconstruction were compared with 30 active uninjured control subjects. Isokinetic strength testing was performed over 5 degrees to 95 degrees knee joint range of motion, 5 angular velocities (50, 100, 150, 200, 250 degrees/s), for concentric and eccentric contractions. Angle and velocity-matched H/Q ratio maps and DCR maps were produced for each group. Difference maps allowed quantification of the differences between the groups. Angle and velocity-matched H/Q ratio maps demonstrated systematic variati...Continue Reading

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