Are you awaiting surgery to have a joint replacement removed (revision surgery)?
Your data can help other patients
If your hospital does not participate in the Northern Retrieval Registry, ask one of your surgical carers to contact us to send us the removed implant(s) (explant(s)). If you consent to allow us to use your anonymised data for research, we can analyse your explants free of charge. Presently, we do have to charge a fee for the collection, however, as we are not funded by the NHS.
Hip, knee and ankle joint analysis
We measure explants to see how much they have worn – i.e. how much material has been lost.
- The total amount – “volumetric wear” – which is measured in mm³.
- The maximum wear depth, which is the single point on the implant which has worn the most. This is measured in millimetres or microns.
If the duration of implantation is known, this allows us to calculate an average wear rate. This value will tell us if the product has undergone excessive wear while in your body.
Just as important as the amount of wear is the distribution of the wear. Medical implants are designed to wear on certain parts of the components. We perform wear mapping as a routine part of our analysis. When we identify wear in unexpected areas this can lead us to suspect there were issues with the product design or manufacture. The position that the components were implanted by the surgeon can also influence the rate and distribution of wear. For this reason, it is preferable that we can perform analysis of any available x ray images.
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