Changes of center of rotation and femoral offset in total hip arthroplasty.

Background: It is a challenge to reconstruct the center of rotation (COR) and femoroacetabular offset anatomically in total hip arthroplasty (THA). We addressed the controversy how we manage to preserve the COR and femoroacetabular offset with an uncemented total hip prosthesis implanted with free hand technique.

Methods: We analyzed a prospective series of 73 patients who underwent primary THA.