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Polyethylene wear of mobile-bearing unicompartmental knee replacement at 20 years


Reference:

Kendrick, B. J., Simpson, D. J., Kaptein, B. L., Valstar, E. R., Gill, H. S., Murray, D. W. and Price, A. J., 2011. Polyethylene wear of mobile-bearing unicompartmental knee replacement at 20 years. Journal of Bone and Joint Surgery - British Volume, 93 (4), pp. 470-475.

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Official URL:

http://dx.doi.org/10.1302/0301-620X.93B4.25605

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Abstract

The Oxford unicompartmental knee replacement (UKR) was designed to minimise wear utilising a fully-congruent, mobile, polyethylene bearing. Wear of polyethylene is a significant cause of revision surgery in UKR in the first decade, and the incidence increases in the second decade. Our study used model-based radiostereometric analysis to measure the combined wear of the upper and lower bearing surfaces in 13 medial-compartment Oxford UKRs at a mean of 20.9 years (17.2 to 25.9) post-operatively. The mean linear penetration of the polyethylene bearing was 1.04 mm (0.307 to 2.15), with a mean annual wear rate of 0.045 mm/year (0.016 to 0.099). The annual wear rate of the phase-2 bearings (mean 0.022 mm/year) was significantly less (p = 0.01) than that of phase-1 bearings (mean 0.07 mm/year). The linear wear rate of the Oxford UKR remains very low into the third decade. We believe that phase-2 bearings had lower wear rates than phase-1 implants because of the improved bearing design and surgical technique which decreased the incidence of impingement. We conclude that the design of the Oxford UKR gives low rates of wear in the long term.

Details

Item Type Articles
CreatorsKendrick, B. J., Simpson, D. J., Kaptein, B. L., Valstar, E. R., Gill, H. S., Murray, D. W. and Price, A. J.
DOI10.1302/0301-620X.93B4.25605
Related URLs
URLURL Type
http://www.ncbi.nlm.nih.gov/pubmed/21464484PubMedCentral
DepartmentsFaculty of Engineering & Design > Mechanical Engineering
Research CentresCentre for Orthopaedic Biomechanics
RefereedYes
StatusPublished
ID Code30685

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