Authors: Peter A Devane Philip J Wraighte David C G Ong J Geoffrey Horne
Publish Date: 2012/03/27
Volume: 470, Issue: 11, Pages: 3003-3006
Abstract
Despite advances in primary THA dislocation remains a common complication In New Zealand NZ dislocations are reported to the National Joint Registry NJR only when prosthetic components are revised in the treatment of a dislocation Closed reductions of dislocated hips are not recorded by the NJRThe NZ NJR identified 570 patients undergoing primary THA from January 1 2008 to December 31 2009 with addresses in the Wellington region The mean age was 675 years range 27–96 years The minimum followup was 2 years mean 3 years range 2–4 yearsSix patients required revision of at least one component for dislocation There was 100 agreement between the hospital database and the NJR Using the NJR criteria of revision of any component as an end point the dislocation rate in the Wellington region after primary THA was 105 The hospital database identified a further eight patients who presented with a dislocation of their primary THA and underwent a closed reduction These patients were not recorded by the NJR The true rate of all dislocations which includes closed reductions was 246This article documents the discrepancy between the NZ NJR reported rate of revision for dislocation and the true rate of dislocation in primary THA We recommend documentation of all dislocations by NJR in their database to allow more accurate comparisons between centers and research outcomes
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