Background Although surgical reconstruction of the anterior cruciate ligament (ACL) is commonly performed to increase stability of the knee, persistent changes in neuromuscular function has frequently been cited as contributing to disability.^{1 2}

Objective This study investigated neuromuscular function (premotor reaction time, reproductive angle inaccuracy and jump ability) in a sample of patients 12 to 28 months following reconstructive ACL operation. In addition, the effect of leg dominance on neuromuscular function was analyzed in a sample of subjects without knee injury.

Methods Ten healthy woman without knee injury and 10 patients following ACL operation participated in the study after they had been screened for neuromuscular function disorders. Premotor reaction time (PRT) of vastus medialis (VM), vastus lateralis (VL), hamstring medialis (HM), and hamstring lateralis (HL) were recorded by electromyography through the examination sudden knee eversion stress. Sensation of position were evaluated as a reproductive angle inaccuracy (RAI) in the difference between a specified angle (15°, 30°, 45°, 60°, and 75°) and the reproduction angle. Two physical therapists evaluated each subject's performance ability using a talent diagnose system (TDS Jump and TDS Flash Jump).

Results The patients showed a significant increase in reaction time of hamstring operated legs (p<.05), systemic reaction time (TDS Flash Jump) (p<.05), and significant decrease in grounding time (TDS Jump) of operated legs (p<.05). For correlation coefficient, no statistically significant changes were found.

Conclusions It was confirmed that a multi function of neuromuscular had decreased though one year or more passed after ACL reconstructive operation, therefore, should be provide information that recovers a multi function of neuromuscular in rehabilitation after ACL operation.