Kinematic Evaluation of the GMK Sphere Implant During Gait Activities: A Dynamic Videofluoroscopy Study

摘要: Joint stability is a primary concern in total knee joint replacement. The GMK Sphere prosthesis was specifically designed to provide medial compartment anterior-posterior (A-P) stability, while permitting rotational freedom of the through flat lateral tibial surface. objective this study establish changes kinematics introduced by during gait activities comparison conventional posterior-stabilized (PS) fixed-bearing and ultra-congruent (UC) mobile-bearing geometries. A-P translation internal/external rotation three cohorts, each with 10 good outcome subjects (2.9 ± 1.6 years postop), Sphere, PS or UC implant were analysed throughout complete cycles using dynamic videofluoroscopy. showed smallest range for level walking, downhill stair descent (3.6 ± 0.9 mm, 3.1 ± 0.8 mm, 3.9 ± 1.3 mm), followed (5.7 ± 1.0 mm, 8.0 ± 1.7 mm, 8.7 ± 1.9 mm) (10.3 ± 2.2 mm, 10.1 ± 2.6 mm, 11.6 ± 1.6 mm) exhibited largest (12.1 ± 2.2 mm), (13.2 ± 2.2°), both descent. This has shown that clearly restricts motion condyle still allowing large axial rotation. additional against geometries, not only demonstrates geometry key factor governing tibio-femoral kinematics, but also itself probably plays more dominant role movement than type activity. © 2019 Authors. Journal Orthopaedic Research$^{®}$ published Wiley Periodicals, Inc. on behalf Research Society. J Orthop Res 37:2337-2347, 2019.