Please use this identifier to cite or link to this item:
|Title:||Stem migration and fretting corrosion of the antirotation pin in the K2/Apex hip system.|
|Epworth Authors:||de Steiger, Richard|
|Other Authors:||Kent, Michael|
|Keywords:||Revision Hip Arthroplasty|
Musculoskeletal Clinical Institute, Epworth HealthCare, Victoria, Australia
|Citation:||J Arthroplasty. 2016 Mar;31(3):727-34.|
|Abstract:||BACKGROUND: Many exchangeable neck hip systems have been withdrawn because of fretting corrosion at the neck/stem coupling. METHOD: Our prospective randomized study evaluating stem stability (Roentgen stereophotogrammetric analysis, dual-energy x-ray absorptiometry) and clinical outcomes between the K2/Apex hip systems was ceased early because of a withdrawal of the stems which had an unfavorably high early revision rate reported in the Australian Orthopaedic Association National Joint Registry (9.3% at 3 years). RESULTS: At 2 years, there are no clinical differences between the stems. Roentgen stereophotogrammetric analysis has identified a high proportion of potentially concerning subsidence and retroversion in both groups, more marked in the K2 stem, although mostly in asymptomatic patients. Dual-energy x-ray absorptiometry has shown similar bone density around the stems. Retrieval analysis of 3 study patients showed fretting corrosion of the antirotation pin and aseptic lymphocyte-dominated vasculitis-associated lesion, with no relationship to bearing type or size. Analysis of 7 further nonstudy K2/Apex stems confirmed similar corrosion. CONCLUSION: This study shows potentially concerning subsidence of both stems and is the first to describe corrosion at the neck-stem interface and a relationship to metal-related pathology.|
|Journal Title:||The Journal of Arthroplasty|
|Affiliated Organisations:||Perth Orthopaedic Institute, Perth, Western Australia, Australia.|
CITRA (Centre for Implant Technology and Retrival Analysis) Medical Engineering and Physics, Perth, Western Australia, Australia.
AOA National Joint Registry, Data Management & Analysis Centre, School of Population Health, University of Adelaide, Adelaide, South Australia, Australia.
|Type of Clinical Study or Trial:||Prospective Study|
|Appears in Collections:||Musculoskeletal|
Files in This Item:
There are no files associated with this item.
Items in EKB are protected by copyright, with all rights reserved, unless otherwise indicated.