Research

A novel method for in vivo knee prosthesis wear measurement


Reference:

Short, A., Gill, H. S., Marks, B., Waite, J. C., Kellett, C. F., Price, A. J., O'Connor, J. J. and Murray, D. W., 2005. A novel method for in vivo knee prosthesis wear measurement. Journal of Biomechanics, 38 (2), pp. 315-322.

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Official URL:

http://dx.doi.org/10.1016/j.jbiomech.2004.02.023

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Abstract

Wear remains an important cause of failure in knee replacement. Of the current methods of early performance assessment or prediction, simulators have been un-physiological, single X-ray film analyses remain limited by accuracy and retrieval and survival methods have a prohibitive time scale. An accurate method is needed to allow a timely assessment of polyethylene component wear in vivo, when a new design is introduced, in order to predict likely outcome. We present a new method for measuring wear in vivo that we believe will allow this prediction of long-term wear. X-ray film pairs were taken of implanted prosthetic metal components. When the X-ray system was calibrated, projections of the appropriate Computer Aided Design (CAD) model could be matched to the shapes on the scanned X-ray films to find component positions. Interpenetration of the metal femoral component into the polyethylene component could then be established and represents our estimate of "wear". This method was used to measure in vivo prosthesis wear to an accuracy of 0.11 mm.

Details

Item Type Articles
CreatorsShort, A., Gill, H. S., Marks, B., Waite, J. C., Kellett, C. F., Price, A. J., O'Connor, J. J. and Murray, D. W.
DOI10.1016/j.jbiomech.2004.02.023
Related URLs
URLURL Type
http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?cmd=Retrieve&db=PubMed&dopt=Citation&list_uids=15598459PubMedCentral
DepartmentsFaculty of Engineering & Design > Mechanical Engineering
Research CentresCentre for Orthopaedic Biomechanics
RefereedYes
StatusPublished
ID Code30846

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