The Influence of Tibial Rotation on Anterioposterior Knee Stability – a Robot-aided In-vitro Study

Anterior Cruciate Ligament (ACL) rupture is one of the most common sport injuries [1]. While the importance of the cruciate ligaments for stabilization of the knee in anteroposterior (AP) direction is evident, their influence on rotational knee stability is still discussed controversially, especially since the doublebundle technique for ACL replacement claims the advantage of improved rotational stability [2,3]. Patients after ACL rupture often report symptomatic knee instability and giving way, especially during fast cutting and pivoting activities. During these activities, enhanced internal and external rotations occur in addition to anterior and posterior loading of the knee. Therefore, the aim of the current study was to systematically analyze the influence of tibial rotation on AP stability of the knee, comparing different conditions of the cruciate ligaments.