Finite element analysis of cam-type femoroacetabular impingement: comparing stress and strain energy density distributions for a healthy control femur versus an impinged femur

摘要

It has been hypothesized that the abnormal stress and strain energy distributions in an impinged femur can result in an unusual rate of bone remodelling which ultimately can cause cartilage destruction and osteoarthritis. Finite element models were created to simulate the healthy control case and the abnormal impingement case. Implementing inverse dynamics data onto the finite element models, it was found that stress and strain energy concentrated at the antero-superior portion of the femoral head-neck junction. In this comparative study, the abnormal geometry demonstrated a higher stress concentration by 21.0% and a higher strain energy density by 29.2% - further suggesting higher presence of mechanical stimuli.