title: Posterolateral aspect and stability of the knee joint. II. Posterolateral instability and effect of isolated and combined posterolateral reconstruction on knee stability: a biomechanical study.
abstract: This study evaluated the correlation between the number of transected posterolateral structures (PLS) and the grade of posterolateral rotational instability, determined the effect of the popliteus muscle-tendon unit on the tibial rotation, and examined the effect of an isolated posterior cruciate ligament (PCL) and combined PCL-PLS reconstruction on knee stability. Sectioning the popliteofibular and lateral collateral ligaments both caused an increase in tibial external rotation. Cutting the PT resulted in a statistically highly significant excessive external rotation and externally shifted neutral position of the tibia over the full range of motion. Tensioning the popliteus muscle-tendon unit led to a statistically highly significant internally shifted neutral tibial rotation and a decreased internal and an increased external rotation without affecting the total rotational arcs. The isolated PCL reconstruction did not affect the external rotation, whereas the combined PCL-PLS reconstruction reset the knee to nearly physiological laxity patterns.
authors.affiliation: Marienhospital, Von-Droste-Strasse 14, 59597 Erwitte, Germany. wkkrudwig@t-online.de
authors.forename: Wilfried K
authors.initials: WK
authors.lastname: Krudwig
authors.forename: Ulrich
authors.initials: U
authors.lastname: Witzel
authors.forename: Karin
authors.initials: K
authors.lastname: Ullrich
mesh_terms: D000328:Adult; D001696:Biomechanical Phenomena; D005260:Female; D006801:Humans; D007593:Joint Instability / Q000209:etiology* / Q000503:physiopathology*; D007719:Knee Joint / Q000503:physiopathology* / Q000601:surgery*; D008297:Male; D009119:Muscle Contraction / Q000502:physiology; D018482:Muscle, Skeletal / Q000503:physiopathology; D016119:Posterior Cruciate Ligament / Q000503:physiopathology* / Q000601:surgery*; D016059:Range of Motion, Articular / Q000502:physiology; D019651:Plastic Surgery Procedures / Q000009:adverse effects*; D012399:Rotation; D013710:Tendons / Q000503:physiopathology; D013977:Tibia / Q000503:physiopathology