Kinematics of a cementless mobile bearing posterior cruciate ligament-retaining total knee arthroplasty |
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Authors: | J Chouteau JL Lerat R Testa B Moyen MH Fessy SA Banks |
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Institution: | 1. Department of Orthopedic Surgery, Hanyang University Hospital, Seoul, South Korea;2. Department of Orthopedic Surgery, Hanyang University Guri Hospital, Gyunggi-do, South Korea;1. Department of Orthopaedic Surgery, Hospital for Special Surgery, 535 E. 70th Street, New York, NY 10021, United States;2. Division of Biostatistics and Epidemiology, Hospital for Special Surgery, 535 E. 70th Street, New York, NY 10021, United States |
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Abstract: | Mobile bearing (MB) total knee arthroplasty (TKA) was developed to provide low contact stress and unconstrained joint motion. We studied a consecutive series of 41 knees with mobile-bearing, posterior cruciate-retaining (CR) TKAs to determine if kinematics resembled normal knees or if kinematics changed over time. Patients were studied at 3 and 21 months average follow-up with weight-bearing radiographs at full extension, 30° flexion and maximum flexion. Shape-matching techniques were used to measure TKA kinematics. Implant hyperextension, maximum flexion and total ROM increased with follow-up. Tibial rotation and condylar translations did not change with time. The medial condyle did not translate from extension to 30°, but translated 5 mm anteriorly from 30° to maximum flexion. Lateral condylar translation was 3 mm posterior from extension to 30°, with no translation from 30° to maximum flexion. Tibiofemoral kinematics in CR-MB-TKAs were stable over time, but did not replicate motions observed in healthy knees. The mobile tibial insert showed rotation and translation at both follow-up examinations, but the patterns of translation were not predictable. |
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