Lookup NU author(s): Dr Alasdair Charles
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Objective - To describe corrosion discovered on implants recovered from dogs after tibial plateau leveling osteotomy (TPLO). Study Design - Descriptive. Animals - Dogs (n = 4) that had TPLO (n = 7) ∼ 3 years earlier. Methods - Implants were recovered surgically and lightly cleaned before visual inspection, scanning electron microscopy (SEM) and energy-dispersive X-ray analysis (EDX). Results - Multiple corrosion sites were found on the recesses of each plate; invariably, there was a corroded area present on that part of the bone screw which had been in contact with a corrosion site on a plate. Most corroded regions featured attached, nonmetallic material believed to be a precipitate arising from interaction with the local environment during electrochemical corrosion. SEM examination of TPLO plates revealed surface porosity, particularly visible in the screw hole recesses. Conclusions - Surface irregularities and porosity of TPLO plates - a consequence of the casting process - are initiation sites for corrosion which, in concert with the crevice geometry between the plate and screw, result in the observed corrosion defects. Clinical Relevance - Implants used for TPLO, a commonly performed veterinary orthopedic procedures may corrode generating a number of chemical species that have the potential to cause disease. © Copyright 2006 by The American College of Veterinary Surgeons.
Author(s): Charles EA, Ness MG
Publication type: Article
Publication status: Published
Journal: Veterinary Surgery
ISSN (print): 0161-3499
ISSN (electronic): 1532-950X
PubMed id: 16842288
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