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
124 of these patients promptly responded. 68 patients had natural product and 56 patients had synthetic product. In the natural injection group of 68 patients, 57 had pain relief at 3 months and 20 of these continued to have relief at 6 months. In the synthetic injection group of 56 patients, 48 had pain relief at 3 months and 28 of these continued to have relief at 6 months. No complications were noted in either of the groups. Difference of WOMAC scores were done at 6weeks and 3 months for each group. The p value of this difference of scores was 0.12 at 6 weeks and 0.92 at 3 months showing no significant difference. The 95% confidence intervals [avian vs synthetic] at 6weeks were −0.8 to 7.2 and at 3 months were −3.8 to 4.2. The p value of clinical examination at 6 months was 0.043 showing significance.
