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Orthopaedic Proceedings
Vol. 94-B, Issue SUPP_XVIII | Pages 65 - 65
1 May 2012
Hart A Lloyd G Sabah S Sampson B Underwood R Cann P Henckel J Cobb PJ Lewis A Porter M Muirhead-Allwood S Skinner J
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SUMMARY

We report a prospective study of clinical data collected pre, intra and post operation to remove both cup and head components of 118 failed, current generation metal on metal (MOM) hips. Whilst component position was important, the majority were unexplained failures and of these the majority (63%) had cup inclination angles of less than 55 degrees. Poor biocompatibility of the wear debris may explain many of the failures.

BACKGROUND

Morlock et al reported a retrospective analysis of 267 MOM hips but only 34 head and cup couples (ie most were femoral neck fractures) and without data necessary to define cause of failure. The commonest cause of failure in the National Joint Registry (NJR) is unexplained.