BACKGROUND: Despite advances in primary THA, dislocation remains a common complication. In New Zealand (NZ), @entity3029 are reported to the National Joint Registry (NJR) only when prosthetic components are revised in the treatment of a dislocation. Closed reductions of dislocated @entity572 are not recorded by the NJR. QUESTIONS/PURPOSES: We compared the true dislocation rate for @entity1 receiving primary THA in the Wellington region with the rate reported by the NZ NJR for the same group of @entity1 . METHODS: The NZ NJR identified 570 @entity1 undergoing primary THA from January 1, 2008, to December 31, 2009, with addresses in the Wellington region. The mean age was 67.5 years (range, 27-96 years). The minimum followup was 2 years (mean, 3 years; range, 2-4 years). RESULTS: Six @entity1 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 1.05%. The hospital database identified a further eight @entity1 who presented with a dislocation of their primary THA and underwent a closed reduction. These @entity1 were not recorded by the NJR. The true rate of all @entity3029 , which includes closed reductions, was 2.46%. CONCLUSIONS: This 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 @entity3029 by NJR in their database to allow more accurate comparisons between centers and research outcomes. LEVEL OF EVIDENCE: Level IV, clinical research study. See Guidelines for Authors for a complete description of levels of evidence.

Do joint registries report true rates of XXXX ?

@entity1 :: ('9606', 'Species') :: ['patients'] @entity572 :: ('MESH:D006617', 'Disease') :: ['hips'] @entity3029 :: ('MESH:D004204', 'Disease') :: ['dislocations']
@entity572 :: (MESH:D006617,Disease) :: ['hip dislocation']
