Recoil-implantation of multiple radioisotopes towards wear rate measurements and particle tracing in rosthetic joints

Jacob A. Warner, Paul N. Smith, Jennifer M. Scarvell, Laura Gladkis, Heiko Timmers

Research output: A Conference proceeding or a Chapter in BookConference contribution

1 Citation (Scopus)

Abstract

This study demonstrates a new method of radioisotope labeling of ultra-high molecular weight polyethylene nserts in prosthetic joints for wear studies. The radioisotopes 97Ru, 100Pd, 100Rh, and 101mRh are produced in fusion evaporation reactions induced by 12C ions in a 92Zr target foil. The fusion products recoil-implant into ultra-high molecular weight polyethylene plugs, machined to fit into the surface of the inserts. During laboratory simulations of the oint motion, a wear rate of the labeled polyethylene may be measured and the pathways of wear debris particles can be raced by detecting characteristic gamma-rays. The concentration profiles of the radioisotopes extend effectively niformly from the polyethylene surface to a depth of about 4 μhe multiplicity of labeling and the use of several gamma-ray lines aids with avoiding systematic measurement uncertainties. Two polyethylene plugs were labeled and one was fitted into the surface of the tibial insert of a knee prosthesis, which had been worn in. Actuation over close to 00,000 cycles with a 900 N axial load and a 24°ion angle removed (14 ± 1) % of the gamma-ray activity from the plug. Most of this activity dispersed into the serum lubricant identifying this as the important debris pathway. Less than % activity was transferred to the femoral component of the prosthesis and the measured activity on the tibial tray was insignificant. Assuming uniform wear across the superior surface of the insert, a wear rate of (12 ± 3) mm3/Megacycle was determined. This is consistent with wear rate measurements under similar conditions using other techniques.

Original languageEnglish
Title of host publicationApplication of Accelerators in Research and Industry - Twenty-First International Conference, CAARI 2010
Pages655-659
Number of pages5
Volume1336
DOIs
Publication statusPublished - 2011
Externally publishedYes
Event21st International Conference on Application of Accelerators in Research and Industry, CAARI 2010 - Fort Worth, TX, United States
Duration: 8 Aug 201013 Aug 2010

Conference

Conference21st International Conference on Application of Accelerators in Research and Industry, CAARI 2010
CountryUnited States
CityFort Worth, TX
Period8/08/1013/08/10

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  • Cite this

    Warner, J. A., Smith, P. N., Scarvell, J. M., Gladkis, L., & Timmers, H. (2011). Recoil-implantation of multiple radioisotopes towards wear rate measurements and particle tracing in rosthetic joints. In Application of Accelerators in Research and Industry - Twenty-First International Conference, CAARI 2010 (Vol. 1336, pp. 655-659) https://doi.org/10.1063/1.3586183