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Journal of Bone and Joint Surgery - British Volume, Vol 90-B, Issue 6, 715-723.
doi: 10.1302/0301-620X.90B6.19875  
Copyright © 2008 by British Editorial Society of Bone and Joint Surgery
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Results of the Birmingham Hip Resurfacing dysplasia component in severe acetabular insufficiency

A SIX- TO 9.6-YEAR FOLLOW-UP

D. J. W. McMinn, FRCS, Consultant Orthopaedic Surgeon1; J. Daniel, FRCS, Director of Research1; H. Ziaee, BSc(Hons), Biomedical Scientist1; and C. Pradhan, FRCS, Staff Orthopaedic Surgeon1

1 The McMinn Centre, 25 Highfield Road, Edgbaston, Birmingham B15 3DP, UK.

Correspondence should be sent to Mr J. Daniel; e-mail: josephdaniel{at}mcminncentre.co.uk

The dysplasia cup, which was devised as an adjunct to the Birmingham Hip Resurfacing system, has a hydroxyapatite-coated porous surface and two supplementary neutralisation screws to provide stable primary fixation, permit early weight-bearing, and allow incorporation of morcellised autograft without the need for structural bone grafting.

A total of 110 consecutive dysplasia resurfacing arthroplasties in 103 patients (55 men and 48 women) performed between 1997 and 2000 was reviewed with a minimum follow-up of six years. The mean age at operation was 47.2 years (21 to 62) and 104 hips (94%) were Crowe grade II or III.

During the mean follow-up of 7.8 years (6 to 9.6), three hips (2.7%) were converted to a total hip replacement at a mean of 3.9 years (2 months to 8.1 years), giving a cumulative survival of 95.2% at nine years (95% confidence interval 89 to 100). The revisions were due to a fracture of the femoral neck, a collapse of the femoral head and a deep infection. There was no aseptic loosening or osteolysis of the acetabular component associated with either of the revisions performed for failure of the femoral component. No patient is awaiting a revision.

The median Oxford hip score in 98 patients with surviving hips at the final review was 13 and the 10th and the 90th percentiles were 12 and 23, respectively.






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Hip, Knee, Trauma, Upper limb, Foot & Ankle, Paediatrics, Oncology, Spine, Arthroplasty, General