Abstract
Nine subjects taking various exercises were evaluated. The anterior drawer test of tibia was performed and from the result the stiffness of anterior cruciate ligament (ACL) was estimated. Quadriceps and hamstrings strengths were estimated from the maximum weight lifted by knee extension and flexion. There was no significant correlation between the anterior displacement and muscle strength. These results indicate that exercises increase the muscle strength but do not increase the stiffness of ACL.
