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In vivo measurement of volumetric wear of a total knee replacement


Reference:

Gill, H. S., Waite, J. C., Short, A., Kellett, C. F., Price, A. J. and Murray, D. W., 2006. In vivo measurement of volumetric wear of a total knee replacement. The Knee, 13 (4), pp. 312-317.

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Official URL:

http://dx.doi.org/10.1016/j.knee.2006.04.001

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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.

Details

Item Type Articles
CreatorsGill, H. S., Waite, J. C., Short, A., Kellett, C. F., Price, A. J. and Murray, D. W.
DOI10.1016/j.knee.2006.04.001
Related URLs
URLURL Type
http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?cmd=Retrieve&db=PubMed&dopt=Citation&list_uids=16784859PubMedCentral
DepartmentsFaculty of Engineering & Design > Mechanical Engineering
Research CentresCentre for Orthopaedic Biomechanics
RefereedYes
StatusPublished
ID Code30840

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