Three-dimensional finite element analysis of un-cemented and cemented femoral prostheses implanted under different bone densities

Objective Three-dimensional finite element analysis was employed to select femoral prostheses according to different bone densities, and simultaneously simulated contrast mechanical tests were performed to determine the age criteria regarding the selection of femoral prosthesis during the hip replacement. Methods Three-dimensional finite element models of femur were established using Solidworks software. Following the known formula, the bone density and elastic modulus at different age brackets were calculated and input into the computer. The human one-foot standing condition was simulated and pressure was loaded on the reconstructed femoral models. Some iomechanical characteristics of un-cemented and cemented femoral prostheses, such as the distress distribution and initial micro-movement at different bone densities, were measured. Results Relatively well-distributed whole distress and slight initial micro-movement of un-cemented femoral prostheses were found in male patients at 30-60 years old and in female patients at 40-55 years old. Symptoms of cemented femoral prostheses the same as the un-cemented femoral prostheses were present in male patients at 60-70 years and in female patients older than 55 years old. Conclusion Results of three-dimensional finite element analysis and simulated contrast mechanical tests suggest that un-cemented femoral prostheses provide better therapeutic effects in male patients younger than 60 years and in female patients