ANALYSIS OF A BROKEN TITANIUM PEDICLE SCREW SUPPORTING A VERTEBRAL PROSTHESIS

Giorgio Eugenio Oscare Giacaglia

Abstract


A research done to determine the cause of a broken titanium pedicle screw supporting a prosthesis inserted to repair a broken spinal vertebra in a 38 year old patient is reported. The rupture was clearly due to fatigue in material of the screw. A first report by a company specializing in mechanical tests of materials suggested that a poor surface finishing of the crew had provoked an initial crack that actually broke the screw by fatigue. A thorough analysis of the problem, based on X-rays of the area showing the broken screw still in place and an analysis of the bar connecting the prosthesis to the screw, concluded that the rupture had been provoked by undue motions of the patients prior to the time necessary for the prosthesis to have an osseous integration with the vertebral region it was supposed to repair.


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ISSN 2179-7625 (online)

DOI registration: 10.32426/engres.

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