KINEMATICS AND MYOELECTRIC ANALYSIS OF ANTERIOR CRUCIATE LIGAMENT RECONSTRUCTED KNEE IN DROP LANDING -A PILOT STUDY

Abstract

This study aimed to investigate the 'lower extremity kinematics and electromyography (EMG) of anterior cruciate ligament (ACL) reconstructed knee during single-leg drop landing. One female elite basketball athlete rehabilitated from ACL reconstruction surgery 33 months prior this study performed five trials of single-leg drop landing from a 300mmhigh platform with the arms crossed over the chest. The motion in sagittal plane was videotaped and was analyzed by a motion analysis system. Foot strike was recognized by a force plate. Synchronized EMG signals from four thigh muscles (vastus medialis, vastus lateralis, medial hamstring, and lateral hamstring) of the landing leg were collected and amplified by an EMG system. The EMG data were trimmed, normalized and filtered. Root mean square (RMS) values of the processed signals were compared. Results showed that thigh muscle activities of ACL-reconstructed leg were lower. Hip joint was more extended before foot strike. Prolonged hip and knee f1exion occurred after foot strike, which delayed the recovery of anatomical position.