In vivo measurement of volumetric wear of a total knee replacement

H. S. Gill, J. C. Waite, A. Short, C. F. Kellett, A. J. Price, D. W. Murray

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Abstract

A new Roentgen Stereophotogrammetric Analysis (RSA) system is reported; it can measure penetration of the metallic femoral component of a Total Knee Replacement (TKR) prosthesis into the polyethylene bearing on the tibial component. This system was used to analyse a study group of six Anatomic Graduated Components (AGC) knee prostheses more than 6 years post-implantation, and to compare with a control group of six newly implanted AGC prostheses. The volumetric loss of polyethylene was estimated by imaging each prosthesis at a series of different knee flexion angles. The mean difference between the RSA measured polyethylene bearing thickness and the manufacturer's quoted values for the control group was -0.03 mm (SD 0.17). The estimated linear penetration at 6.4 years in this prosthesis was determined to be 0.1 mm/year. Volumetric wear was estimated to be 600-700 mm(3)/year at 6.4 years, equating to approximately 100 mm(3)/year. This does not appear to be clinically significant amount of wear as this prosthesis has excellent survival at 10 years.
Original languageEnglish
Pages (from-to)312-317
Number of pages6
JournalThe Knee
Volume13
Issue number4
DOIs
Publication statusPublished - 2006

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    Gill, H. S., Waite, J. C., Short, A., Kellett, C. F., Price, A. J., & Murray, D. W. (2006). In vivo measurement of volumetric wear of a total knee replacement. The Knee, 13(4), 312-317. https://doi.org/10.1016/j.knee.2006.04.001