A numerical study on bone adaptation around uncemented press-fit acetabular components

Implant-induced bone remodeling has been identified as a potential reason behind aseptic loosening of uncemented acetabular cups. Using three-dimensional Finite Element models of intact and implanted pelvis, in combination with bone remodeling algorithm, the present study aims at gaining an insight into the evolutionary bone adaptation around a press-fit uncemented acetabular component. Eight static load cases of normal walking cycle, modeled by 21 muscle forces and hip joint reaction force, were considered in the present study in order to investigate deviation in load transfer due to implantation and peri-acetabular bone adaptation. Based on the results of the present study, a press-fit acetabular component was found to increase load transfer through acetabular cortex. Consequently, predominant bone apposition was observed within the acetabular peripheral cancellous bone. However, a reduction in the density of cancellous bone near the acetabular pole was also observed.