Delay of total hip arthroplasty to advanced stage worsens post-operative hip motion in patients with femoral head osteonecrosis

摘要

Purpose Osteonecrosis of the femoral head (ONFH) is commonly detected in young patients and most surgeons tend to delay total hip arthroplasty (THA) until the end stage of the disease. We hypothesised that post-operative range of motion (ROM) of the hip as well as baseline ROM at the time of surgery decreases with the disease progression. The purpose of this study was to determine whether patients, who were operated at an advanced stage, have pre- and post-operative hip ROM similar to ROM of patients, who were operated at earlier stages. Methods Eight hundred and fifty patients (850 hips) treated with THA for ONFH were classified according to pre-operative stages of Association Research Circulation Osseous (ARCO). Fifty-six patients were operated at stage 2, 458 at stage 3, and 336 at stage 4. Pre-operative and one?year post-operative ROM was compared among the stages. Results Pre-operative sum of hip ROM decreased with the progression of ARCO stage ( P ?