Factors determining ideal head size | |
Factors favoring large diameter head | Factors limiting head diameter |
・ Lower dislocation rates ・ Improved stability ・ Increased head-neck ratio leads to greater ROM ・ Impingement-free ROM ・ Near “anatomic” head size ・ COC large heads have less stripe wear ・ COC heads have lower risk of femoral head fracture | ・ Patient anatomy ・ Bearing material ・ Increased serum ions in MOM hip arthoplasty ・ Recent concerns of adverse local tissue reactions (ALTR) and aseptic lymphocytic vasculitis-associated lesions (ALVAL) with MOM hip ・ Psoas impingement (noted with MOM) |