Patients with anterior cruciate ligament deficiency typically do not have quadriceps muscle activity during stance and this gait pattern has been termed ＂quadriceps avoidance＂gait. We performed physical examination and computerized
3-dimensional
motion analysis on 7 normal controls and 7 patients who had anteior cruciate ligament reconstruciton by having the patient walking in 3 differents walking velocity, I, e, a selfselected walking velocity which the patients felts comfortable, a
velocity
set a metronojme with a frequency of 108 per minute, and a fast velocity (the normal controls walk with a frequency of 126 per minute, the patients walk as fasts as possible.) All the 7 patients were male and the average age was 32.1 years. The
average
follow up duration after oper4ation was 21.0 months. The measured average points by the modified Laron scoring scale was 83.14 and the results were 1 excellent, 5 good and 1 fair. In all atients, limping was rarely observed and little limitation
was
observed in stepping, squatting and running. All patients complained mild discomfort on the knee joint during exercise. There were also no limitation of range of motion on the knee joint in all patients. On gait analysis using 3-dimensional
motion
analysis system, external flexion moment of the injure knee joint was decreased compare to normal controls and was more decreased when the patients walked in a faster walking velocity during the midstance and the loading response phases. However
net
external flexion moment of the knee joints implying the activity of quadriceps muscle was observed. In summary, gait analysis using 3-dimensional motion analysis system may help us to evaluate the present state, objectively and to anticipate the
prognosis of the patients who had anterior cruciate ligament reconstruction.
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