Abstract
An inter-limb comparison of ten subjects with unilateral anterior cruciate ligament (ACL) deficiency was undertaken in several areas. Isokinetic muscle testing was carried out at joint angular velocities of 60, 180 and 300/s. Each subject was videotaped at 200 Hertz while running on a treadmill at a recreational jogging pace, and kinematics were calculated. Electromyographic data were collected from the vasti lateralis and biceps femoris muscles during running. Isokinetic muscle testing revealed a significant quadriceps deficit in the ACL-deficient limb. During jogging, normalized electromyographic profiles showed increased quadriceps activity during a 200 ms period centred on footstrike. Earlier electromyographic activity was observed from the biceps femoris of the ACL-deficient limbs shortly after footstrike. It was concluded that even during straight line running, an activity not usually thought to affect individuals with ACL deficiency, compensatory techniques may be observed.
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