There was a special,quadriceps avoidance gait, during stance phase in patients with anterior cruciate ligament deficience (ACLD). Andriacchi and his colleagues have declared that the quadriceps would produce an anterior displacement of the tibia on the femur. Therefore, patients with ACLD would tended to avoid quadriceps contraction. These gait adaptations are presumably produced by a subconscious protective mechanism to avoid the excessive anterior displacement of the tibia. On the other hand, we find the weakness of quadriceps or the instability of knee joint was a real cause leading to quadriceps avoidance gait in patients with ACLD. The purpose of this study was to search for the mechanism of quadriceps avoidance gait. A 370 motion analysis system, Bertec force plates and MA - 100 electromyographer were used to evaluate the net external moment as well as myoelectric activation of the knees in patients with ACLD to obtain the kinetic and kinematic data of 18 patients with ACLD and one normal subject. After data analysis, we have drawn three conclusions as the followings: (1) ¡¥Quadriceps avoidance gait¡¦ might be oniy a compensation phenomenon to the patients with anterior instability of the knee. Knee flexors play the compensating role of displacing the tibia anteriorly on the femur. (2) Three factors that affected the net external moment of knee in this study: the muscle strength of quadriceps, knee angle of stance phase in gait cycle and joint stability of the knee. (3) The contralateral knee (sound side) showed similar gait pattern and comparable knee moment like the affected side.
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