In vivo kinematics of total knee arthroplastyCONCAVE VERSUS POSTERIOR-STABILISED TIBIAL JOINT SURFACEJ. Uvehammer, MD, Consultant Orthopaedic Surgeon1; J. Kärrholm, PhD, Professor1; and S. Brandsson, MD, Consultant Orthopaedic Surgeon11 Department of Orthopaedics, Sahlgrenska and East Hospital, Sahlgrenska University Hospital, S-413 45 Gothenburg, Sweden. Correspondence should be sent to Dr J. Uvehammer. We studied the kinetics of the knee in 20 patients (22 knees) 12 months after total knee arthroplasty (TKA), by using three-dimensional radiostereometry and film-exchanger techniques. Eleven knees had a concave (constrained) tibial implant and 11 a posterior-stabilised prosthesis. Eleven normal knees served as a control group. In the posterior-stabilised knees there was less proximal and posterior displacement of the centre of the tibial plateau during extension from 45° to 15°, with a decrease in the anterior translation of the femoral condyles of 4 mm at 45°. There was less internal tibial rotation and increased distal positioning of the centre of the tibial plateau with both designs when compared with the normal knees, and in both the centre of the plateau was displaced posteriorly by more than 1 cm. Increased AP translation has been recorded in all prosthetic designs so far studied by radiostereometry. The use of a posterior-stabilised design of tibial insert could reduce this translation but not to that of the normal knee. This article has been cited by other articles:
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