Posted April 26, 2012

An independent series

D. W. Murray, FRCS, Orthopaedic Surgeon, Professor1 ;
G. Grammatopoulos, MRCS, Orthopaedic Registrar1 ;
H. Pandit, DPhil, FRCS, Orthopaedic Surgeon1 ;
R. Gundle, DPhil, FRCS, Orthopaedic Surgeon2 ;
H. S. Gill, DPhil, Lecturer in Orthopaedic Engineering1 ;
and
P. McLardy-Smith, FRCS, Orthopaedic Surgeon2

Abstract

Recent events have highlighted the
importance of implant design for survival and wear-related
complications following metal-on-metal hip resurfacing
arthroplasty. The mid-term survival of the most widely used
implant, the Birmingham Hip Resurfacing (BHR), has been
described by its designers. The aim of this study was to
report the ten-year survival and patient-reported functional
outcome of the BHR from an independent centre.

In this cohort of 554 patients (646 BHRs)
with a mean age of 51.9 years (16.5 to 81.5) followed for a
mean of eight years (1 to 12), the survival and
patient-reported functional outcome depended on gender and
the size of the implant. In female hips (n = 267) the
ten-year survival was 74% (95% confidence interval (CI) 83
to 91), the ten-year revision rate for pseudotumour was 7%,
the mean Oxford hip score (OHS) was 43 (sd 8) and the mean
UCLA activity score was 6.4 (sd 2). In male hips (n = 379)
the ten-year survival was 95% (95% CI 92.0 to 97.4), the
ten-year revision rate for pseudotumour was 1.7%, the mean
OHS was 45 (sd 6) and the mean UCLA score was 7.6 (sd 2). In
the most demanding subgroup, comprising male patients aged <
50 years treated for primary osteoarthritis, the survival
was 99% (95% CI 97 to 100).