期刊
HIP INTERNATIONAL
卷 32, 期 5, 页码 677-684出版社
SAGE PUBLICATIONS LTD
DOI: 10.1177/1120700020979275
关键词
Hip arthroplasty; modular; retrieval; metal ions
类别
资金
- British Orthopaedic Association through DePuy International Ltd. (Leeds, UK)
- British Orthopaedic Association through Zimmer GmbH (Winterthur, Switzerland)
- British Orthopaedic Association through Smith & Nephew UK Ltd. (Warwick, UK)
- British Orthopaedic Association through Biomet UK Ltd. (Bridgend, UK)
- British Orthopaedic Association through JRI Ltd. (London, UK)
- British Orthopaedic Association through Finsbury Orthopaedics Ltd. (Leatherhead, UK)
- British Orthopaedic Association through Corin Group PLC (Cirencester, UK)
- British Orthopaedic Association through Mathys Orthopaedics Ltd. (Alton, UK)
- British Orthopaedic Association through Stryker UK Ltd. (Newbury, UK)
This study compared different modular metal-on-metal implants from the same manufacturer and found that modular implants had a higher incidence of adverse local tissue reaction, which may be related to the modular junctions, especially the neck-stem junction, which was more susceptible to corrosion.
Background: Modularity of metal-on-metal (MoM) implants has come under scrutiny due to concerns regarding additional sources of metal debris. This study is a retrieval analysis of implants from the same manufacturer with the same MoM bearing surface. The difference between the implants was presence or absence of modular junctions. Methods: This is a retrospective study of 31 retrieved implants from 31 patients who received a Conserve Wright Medical MoM hip prosthesis. The 31 implants consisted of 16 resurfacings and 15 implants with modular junctions; 4 conventional THAs and 11 modular-neck THAs. Results: 43% of pre-revision MRI scans performed on resurfacing implants and 91% performed on the modular implants illustrated evidence of an adverse local tissue reaction. There was no difference in pre-revision blood metal ion levels or bearing surface wear between the resurfacings and modular implants. The neck-head tapers of the modular group showed low levels of material loss. However, the neck-stem tapers showed increased severity of corrosion and material loss Conclusions: The modular implants had an increased incidence of adverse local tissue reaction. This could be related to the presence of modular junctions, particular the neck-stem junction which showed increased susceptibly to corrosion
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