Changes in Isokinetic Muscle Strength of the Lower Extremity in Recreational Athletes with Anterior Cruciate Ligament Reconstruction

in Journal of Sport Rehabilitation
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To investigate changes in muscle strength in the lower extremity after ACL reconstruction.


Prospective case series.

Dependent Variables:

Isokinetic muscle strength measured in 6 movements (hip extension/flexion, hip adduction/abduction, knee extension/flexion) and circumference of the thigh/calf.


Clinic and home.


44 (24 men, 20 women) between the ages of 16 and 47 years with an ACL rupture. All underwent reconstruction via a semitendinosus autograft.

Main Outcome Measures:

The peak torque for each joint movement was recorded. Repeated-measures ANOVA and power analysis were conducted to detect significant interaction effects.


The decline of muscle strength after ACL reconstruction remained not only in the knee extensors and flexors but also in the hip adductors.


Rehabilitation programs that address the behavioral patterns and physiological characteristics of an ACL injury will benefit the athlete’s whole body and lead to a full recovery.

Urabe and Onari are with the Institute of Health Sciences, and Ochi, the Dept of Orthopedic Surgery, Hiroshima University Faculty of Medicine, Hiroshima, 734-8551 Japan.