Finite element analysis of prosthesis position during hip arthroplasty / 中国组织工程研究

ABSTRACT

BACKGROUND:Three-dimensional finite element studies found that the instal ation location of the hip prosthesis is closely related to the effects of hip replacement, but studies on different anteversion and abduction angle of the hip prosthesis mounting position on the effects of hip biomechanics are not much. OBJECTIVE:To analyze the biomechanical characteristics of different prosthetic positions in hip arthroplasty using three-dimensional finite element analysis. METHODS:One healthy volunteer was selected and data of pelvis and femur were col ected. Three-dimensional geometric model of this volunteer was established and received finite element network partitioning. CT scan was used to obtain prosthesis model data and accurate prosthesis model was established. 16 kinds of different prosthesis position model of hip replacement were established. Vertical y downward force of 780 N was applied on the top of sacroiliac joint and pubic symphysis. The acetabular stress peak, femoral stress peaks, polyethylene liner peak stress and polyethylene liner damage zone volume of 16 kinds of model were observed. RESULTS AND CONCLUSION:(1) The acetabular stress peak, femoral stress peaks, polyethylene liner peak stress and polyethylene liner damage zone volume of 16 kinds of different prosthesis position model of hip replacement, anteversion angle 10° abduction angle 50° got the best results. The acetabular stress peak was 51.23 MPa;femoral stress peak was 26.34 MPa. Polyethylene liner peak stress was 5.288 MPa and polyethylene liner damage zone volume was 2.239×10-7 m3. (2) These results indicated that anteversion angle 10° abduction angle 50° is the ideal hip replacement degree. The peak stresses of acetabulum, femur, and polyethylene liner at this instal ation angle are minimum;polyethylene liner damage zone volume is also minimum. This can provide data for clinical reference.