Knee instability after acute ACL rupture affects movement patterns during the mid-stance phase of gait.

Hurd WJ, Snyder-Mackler L

The purpose of this study was to identify gait asymmetries during the mid-stance phase of gait among subjects with knee instability ("non-copers") after acute anterior cruciate ligament (ACL) rupture. Twenty-one non-copers with acute, isolated ACL injury ambulated at their intentional walking speed as kinetic, kinematic, and electromyographic (EMG) data were collected bilaterally. Lower extremity movement patterns and muscle activity were analyzed during the mid-stance and weight acceptance phases of stance. The authors discuss the differences exhibited when compared to the uninjured limb.  They conclude that the variable combination of muscle adaptations that produce joint stiffness, and the ability of both the ankle and the hip to compensate for lower knee control indicate the non-coper neuromuscular system may be more malleable than previously believed.

Journal of Orthopedic Research, 2007, 25(10), 1369-77

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