Purpose: The purpose of this present study was to examine contralateral ACL injury cases after ACL reconstruction,\r\nto determine the characteristics of such injuries.\r\nMethods: We performed a retrospective analysis of 24 patients with contralateral ACL injury after ACL\r\nreconstruction. The control group consisted of 200 cases with unilateral ACL injury. The following were examined in\r\nthe contralateral group: timing of the contralateral ACL injury, and the situations of the initial and contralateral ACL\r\ninjuries. The following items were compared between the contralateral and control groups: age at the time of initial\r\ninjury, level of competitive sports using Tegner activity scores, knee anterior laxity (KT-1000), and the ratio (%) of\r\naffected to unaffected legs in the strengths of the knee extensor and flexor muscles 6 months after surgery.\r\nResults: Examination of injury situations showed that approximately 70% of the contralateral group was injured in\r\nsituations similar to those at their initial injuries. There were no significant differences between the two groups in\r\nage at the time of initial injury , Tegner activity scores, knee anterior laxity, and the strengths of the knee extensor,\r\nflexor muscles and H/Q ratio 6 months after reconstruction. But, the age at the time of initial injury trended to be\r\nlow in contralateral group.\r\nConclusions: Knee anterior laxity and muscle weakness of the reconstructed legs six months following surgery\r\nwere not individually related to contralateral ACL injury occurring approximately two years after surgery.
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