Demonstration of a New Technique Using Radioisotope Tracers to Measure the Backside Wear Rate on Tibial Inserts |
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Authors: | Jacob A Warner Laura G Gladkis Paul N Smith Jennifer M Scarvell Heiko Timmers |
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Affiliation: | (1) School of Physical, Environmental and Mathematical Sciences, University of New South Wales, Canberra Campus, Canberra, ACT, 2600, Australia;(2) Trauma and Orthopaedic Research Unit, The Canberra Hospital, P.O. Box 11, Woden, ACT, 2606, Australia;(3) Australian National University, Medical School, ANU, Canberra, Australia |
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Abstract: | Local backside wear measurements on ultra-high 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 recoil-implanted 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. |
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Keywords: | |
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