title: Knee kinematics in medial arthrosis. Dynamic radiostereometry during active extension and weight-bearing.
abstract: We studied the kinematics of the knee during weight-bearing active extension in 14 patients with medial osteoarthrosis (OA) and in 10 controls using dynamic radiostereometry. Between 50 degrees and 20 degrees of extension the OA knees showed decreased internal tibial rotation corresponding to less posterior displacement of the lateral femoral flexion facet center. The midpoint between the two tips of the tibial intercondylar eminence occupied a more posterior position within the range of motion analyzed. The observed changes were similar to those previously recorded in chronic tear of the anterior cruciate ligament. Patients with medial arthrosis of the knee joint show a specific and abnormal pattern of joint motion.
authors.affiliation: Department of Orthopaedics, Sahlgrenska University Hospital, Göteborg University, Göteborg, S41345, Sweden.
authors.forename: Tuuli
authors.initials: T
authors.lastname: Saari
authors.forename: Lars
authors.initials: L
authors.lastname: Carlsson
authors.forename: Jón
authors.initials: J
authors.lastname: Karlsson
authors.forename: Johan
authors.initials: J
authors.lastname: Kärrholm
mesh_terms: D000293:Adolescent; D000328:Adult; D000368:Aged; D001696:Biomechanical Phenomena; D005260:Female; D006801:Humans; D021621:Imaging, Three-Dimensional / Q000379:methods*; D007593:Joint Instability / Q000000981:diagnostic imaging* / Q000209:etiology / Q000503:physiopathology*; D008297:Male; D009068:Movement; D009119:Muscle Contraction; D020370:Osteoarthritis, Knee / Q000150:complications / Q000000981:diagnostic imaging* / Q000503:physiopathology*; D011857:Radiographic Image Interpretation, Computer-Assisted / Q000379:methods*; D016059:Range of Motion, Articular; D016474:Weight-Bearing