Abstract
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The objective measurement of knee motion during functional activities with 3D motion analysis has provided great insights into the restoration of knee biomechanics after ACL reconstructions and any remaining deficits. Several studies have documented that ACL reconstruction reduces but does not restore excessive internal knee rotation. This finding may provide a biomechanical rationale for the increased rate of knee osteoarthritis among athletes who had an ACL tear. More recent, anatomic ACL reconstruction techniques may ameliorate this problem and lead to better long-term outcomes.