EVALUATION OF BIRMINGHAM HIP RESURFACING WITH OXFORD HIP SCORE, A RETROSPECTIVE AUDIT OF 150 PATIENTS

Abstract

Introduction: Metal on metal hip resurfacing is a bone conserving procedure with excellent medium term results. A retrospective audit of 150 consecutive Birmingham Hip resurfacings, performed by a single surgeon at a DGH was carried out.

Materials and Methods: We report 150 hip resurfacings implanted between June 2001 to June 2004. There were 99 male and 51 female hips. The mean age was 50.7 years (38–75years). Range of follow up was 6 months to 45 months (average 20.1 months)

Pre operative diagnosis was Osteoarthritis (n=135), osteonecrosis(n=8),traumatic(n=2),dysplasia(n=3),Slipped capital femoral epiphysis (n=1) and ankylosing spondylitis (n=1). Al hips were implanted via the posterior approach. Clinical assessment, by postal questionnaire, was by pre and post-operative Oxford Hip scores (OHS) and X-rays were reviewed.

Results: Range of follow up was 6 months to 42 months (average 20.1 months). No patient was lost to follow up. The mean pre operative Oxford hip score was 41 (r=27–56). The score was 15.1 (r=12–29) at the time of questionnaire.

Complications included: One femoral neck fracture at 3 months requiring revision to a stemmed “big ball” THR, one deep infection requiring early wash out with salvage of the hip prosthesis, (both the patients are now doing well. OHS 13 and 15 respectively) and one asymptomatic stress fracture of femoral neck, which healed without intervention (OHS 12).

There was one dislocation in a neuropathic hip requiring bracing. (OHS 29). There was one retained alignment pin needing removal. Otherwise patients were highly satisfied with the operation with excellent function and Hip scores.

Conclusion: Our study has demonstrated that, in the short term and in young age group, this prosthesis gives excellent functional results, with an acceptably low complication rate. Long term surveillance of these patients will provide further data to compare our results with specialist centres.