In silico gait analyses after surgical correction for cam femoroacetabular impingement

The purpose was to compare muscle and hip contact forces (HCF) during gait in FAI patients pre- and post-surgery. Hip kinematics and kinetics were computed and muscle and HCF were estimated using musculoskeletal modelling. FAI patients showed significant improvement scores in reported outcomes, reduced forces in the hamstrings and in the rectus femoris. Muscle forces of the iliacus and psoas major of both FAI groups were reduced when compared to the control. While there were no differences in HCF magnitudes between the FAI groups, they demonstrated lower peak hip contact forces in the anterior and superior directions when compared to the CTRL, causing a reduced peak force magnitude. Gait adaptations affected by the FAI syndrome do not restore to normal standards 2-years after FAI surgical correction.