RESUMEN
Objective To explore the feasibility of the reconstruction of three dimensional dynamic finite element model of the knee joint based on two-dimensional CT and MRI image data. To analyze the impact of mobile-bearing versus fixed-bearing platform prostheses of the knee joint on patellofemoral stress by the finite element method. Methods A three-dimensional digital model of the knee joint including bone,cartilage,meniscus, ligaments and tendons was reconstructed through the Mimics software. The best clinical bone cutting angle and implant placement position measurement were simulated according to the standard of total knee replacement by computers in a three-dimensionalknee model. A three-dimensional dynamic finite element model of mobile-bearing and fixed-bearing total knee arthroplasties was reconstructed finally. The data was analyzed by the SPSS 19.0 software. The test standard level α was 0.05. Results There was no significant difference in the peak value of patellofemoral stresses between fixed-bearing and mobile-bearing platform posterior cruciate-substituting prostheses at 0° ,30° ,60° ,90° ,or 120° of knee flexion(P>0.05). Conclusion There is no significant difference in the peak value of patellofemoral stresses between fixed-bearing and mobile-bearing platform prostheses.