The aim of the study was to whether the bone grafting techniques used affected the long term stability of the acetabular implant. 41 patients treated with a cemented total hip replacement with pre-operative protrusio or central acetabular defects at surgery were identified. The severity of initial protrusio was determined on plain AP pelvis radiographs by measuring the distance of the medial acetabular wall from the ilio-ischial line. The post-operative and last follow-up x-rays were reviewed, the thickness of the medial wall and the centre-edge angle of the cup was measured.Introduction
Methods