Hemispheric cups do not reproduce acetabular rim morphology.

Background: Iliopsoas impingement is a recurrent complication following THA, caused by muscle friction against a protrusive prosthetic cup.This study was designed to quantify the dimensional variations in acetabular rim profiles, with particular regard to the iliopubic valley, in order to suggest means to prevent iliopsoas impingement.

Material And Methods: 34 cadaver pelvises were analyzed using a hip navigation system.