Demonstration of a new technique using radioisotope tracers to measure the backside wear rate on tibial inserts

Jacob Warner, Laura Gladkis, Paul Smith, Jennie Scarvell, Heiko Timmers

Research output: Contribution to journalArticle

4 Citations (Scopus)


Local backside wear measurements on ultrahigh molecular weight polyethylene (UHMWPE) tibial inserts in LCS mobile bearing knee prostheses have been performed using a new radioisotope tracing technique. The radioisotope tracers 97Ru and 101mRh were synthesized via a fusion evaporation reaction and recoilimplanted into cylindrical plugs of UHMWPE. The labelled plugs were carefully fitted into tibial inserts at two relevant locations. With bovine serum acting as a lubricant, the tibial inserts were then worn in vitro for 500,000 and 780,000 cycles, respectively, in a pneumatic knee motion simulator. Results reflect the non-linear change of wear during the wear-in phase and its evolution to a long-term steady-state rate. This new technique shows potential for extracting localized wear rates across the backside of a tibial insert in order to develop a comprehensive backside wear model. © Springer Science+Business Media,
Original languageEnglish
Pages (from-to)139-145
Number of pages7
JournalTribology Letters
Issue number2
Publication statusPublished - 2012


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