Finite element analysis of hip resurfacing arthroplasty with different implant angles

Objective: To explore the biomechanical influences of femoral prosthesis implantation angle in 3-dimensional finite element (3D FE) models of Hip Resurfacing Arthroplasty (HRSA). Methods: Five different implant angles of HRSA 3D FE models were constructed based on the human anatomical data from multislice spiral CT. The femoral prosthesis implantation angle was 120°, 125°, 130°, 135°, 140°, and 145° respectively. Pressure was added on each model to simulate status in normal walking. The patterns of the stress distribution on each model were analyzed. Results: The stress concentration presented at head-neck junction part of the resurfaced femur. The maximum Von Mises stress value was decreased while increasing the femoral implant angles. However, the change was not obviously when the angle range from 135° to 145°. Conclusion: The optimal angle of femoral prosthesis implantation in HRSA is from 135° to 145°. (authors)