Functional outcome of rotating platform total knee arthroplasty - A prospective observational study

Abstract

Introduction: Rotating platform (RP) is a form of mobile-bearing design for total knee arthroplasty (TKA). This reduces the polyethylene contact stresses and the forces acting on tibial component and bone cement interfaces. It increases the femoral roll-back and flexion. The objective was to assess the functional outcome of rotating platform design in primary TKA, in patients with osteoarthritis of knee and the association of age and gender with the outcome. Materials and methods: A prospective observational study was done on 42 patients who underwent primary TKA with RP design and followed-up for one year. The outcome was assessed with the Knee Society Score at one year. Data analysis was done using statistical package SPSS V-27.0. Results: The mean age was 64.33(±6.12). The mean pre-op knee clinical score was 30(±6.409), which improved to mean post–op score of 92.17(±5.53). 37(88.1%) had excellent and 5(11.9%) had good results. 7(70%) patients in the age group <60 years, 24(96%) cases of 60–69 years and 6(85.7%) cases of ≥70 years had excellent results. 23(95.8%) females and 14(77.8%) males had excellent knee clinical scores. The mean pre-op knee functional score was 33.81(±9.988), which improved to a mean post–op score of 82.38(±6.917). 36 cases (85.7%) had excellent and 6(14.3%) had good results. 7(70%) patients <60 years, 22(88%) of 60- 69 years and 7(100%) of ≥70 years had excellent results. 21(87.5%) females and 15(83.3%) males had excellent knee functional scores. Conclusion: Total knee arthroplasty with rotating platform design has shown excellent clinical and functional outcome without any serious complications at one year follow-up.

Keywords

• total knee arthroplasty
• functional outcome
• rotating platform design
• knee scoring system