Corrosion of hip replacements - Is it a Problem?
The London Materials Society invites you for a lecture about orthopaedic implants, medical devices and how they tie into the latest research into corrosion, by Professor Gordon Blunn from UCL.
We look forward to your attendance to our free event!
Recently it has been shown that failure of hip replacements is related to corrosion at the modular junctions. This corrosion results in the release of metal ions causing adverse reactions such as pain and the development of pseudotumours; these will require the hip to be revised.
Corrosion at thetrunion interface has been identified and measured in retrievals and has been replicated in in-vitro tests.
These tests show that the main variables are:
- The surface finish of the tapers
- Galvanic corrosion associated with the use of mixed alloys
- The position of the implant, which will increase bending moments and torque on the trunion interface
- And most importantly the way the surgeon fits both interfaces together
Methods to reduce taper corrosion have been examined and have been successful.
Professor Gordon Blunn
Professor Blunn began working in Biomedical Engineering in 1986; he was appointed a lecturer under the late John Scales, who developed the Stanmore range of implants. In 1999 Gordon became Professor of the John Scales Centre for Biomedical Engineering at the Institute of Orthopaedics & Musculoskeletal Science (IOMS) at Stanmore; he is also deputy director for a newly formed cross faculty Institute of Biomedical Engineering. Prof. Blunn is now working at UCL within the department of Materials and Tissue.
Professor Blunn has extensive research experience in orthopaedic medical devices, materials and musculoskeletal tissues. A number of his research projects have been translated into clinical practice. He has worked on the reattachment of tendons to bone and to implant surfaces, the integration of implants with the skeleton, the wear of implant bearing materials and the use of bone graft substitute materials. Recently his research has focused on the design and development of implants, retrieval analysis and reconstruction of bone and joints.
He has published over 150 papers in peer-reviewed journals; holds a number of patents on medical devices as well as being a scientific advisor to a number of SMEs.