Non-uniformity of contact stress on polyethylene inserts in total knee arthroplasty

This study examined tibiofemoral contact stresses in 15 commercially available TKR designs, using digitally imaged pressure-sensitive film. The objectives were (1) to determine the correlation between minimization of spatial mean contact stress and minimization of the amount of overloaded (>10 MP...

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Bibliographic Details
Published in:Clinical biomechanics (Bristol) 1996-03, Vol.11 (2), p.75-80
Main Authors: Bristol, RE, Fitzpatrick, DC, Brown, TD, Callaghan, JJ
Format: Article
Language:English
Subjects:
compression moulding
contact stress
machining
Total knee arthroplasty
UHMWPe
wear
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Summary:This study examined tibiofemoral contact stresses in 15 commercially available TKR designs, using digitally imaged pressure-sensitive film. The objectives were (1) to determine the correlation between minimization of spatial mean contact stress and minimization of the amount of overloaded (>10 MPa) polyethylene contact area, and (2) to ascertain the difference in contact stresses for machined versus moulded polyethylene inserts. The data showed that there was no statistically significant (design rank-order) correlation of spatial mean contact stress with overloaded polyethylene area. The data also showed that machining cutter preparation of the polyethylene insert caused substantial local contact stress non-uniformities that corresponded to the pattern of grossly visible machining marks.
ISSN:0268-0033
1879-1271
DOI:10.1016/0268-0033(95)00028-3