Finite element analysis of the effect of acetabular cup horizontal displacement on the stress distribution in cementless femoral prosthesis-bone interface in total hip arthroplasty
QIU Wei-hua，LI Jian-yi，LIN Li-jun
Chinese Journal of Clinical Anatomy ›› 2018, Vol. 36 ›› Issue (5) : 557-564.
Finite element analysis of the effect of acetabular cup horizontal displacement on the stress distribution in cementless femoral prosthesis-bone interface in total hip arthroplasty
Objective Using the three dimensional finite element analysis, the effect of acetabular cup horizontal displacement on the stress distribution in cementless femoral prosthesis-bone interface in total hip arthroplasty was studied. Methods Pelvis and femur of a normal human were scanned by sprial CT. Using the computer simulation technology, the three-dimensional model of the pelvis and femur was reconstructed, after which the total hip arthroplasty in the model was simulated. The horizontal position of the acetabular cup varied from -10 mm to +10 mm，compared to hip joint center, which was divided into 11 consecutive experimental groups averagely, each group was 2 mm in width. When a simulated load was applied, the Von Mises stress distribution in cementless femoral prosthesis-bone interface was observed and analyzed. Results The distribution pattern of the Von Mises stress in femur did not change with the horizontal displacement of acetabular cup. The stress mean of each group varied from (4.728±2.152)MPa to (5.431±2.465)MPa. The difference of mean was statistically significant. The mean, range and standard deviation of stress decreased with cup medialization, which showed that they were highly negatively correlated. The changes of stress in proximal prosthesis stem-bone interface were similar to those in the whole femoral prosthesis-bone interface. Conclusion The horizontal ingression of prosthesis decreases the stress in cementless femoral prosthesis-bone interface, and makes the stress more well-distributed as well.
Total hip arthroplasty / Acetabular cup / Von Mises stress / Stress distribution / Finite element analysis
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