Mechanical failure of revision knee prosthesis at both femor
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This is a report of a mechanical failure of an S-ROM revision total knee prosthesis.The prosthesis was used as a revision implant following deep periprosthetic infection in a morbidly obese male. The prosthesis failed on both the femoral and tibial sides at the modular metaphyseal stem junctions and required a further revision using the same type of implant after infection was excluded. A 57-year-old male had previously undergone a left total knee arthroplasty in 1999 for osteoarthritis. He acquired a late deep periprosthetic infection with a multi-resistant Staphylococcus epidermidis. The organism was sensitive to vancomycin and rifampicin. A two-stage revision was undertaken after clinical signs of infection had resolved and blood parameters had normalized. Intra-operative gram stain was negative for microorganisms and frozen section of deep tissue was less than five polymorphs per high power field. A cemented S-ROM prosthesis was implanted using a coronal tibial osteotomy and a lateral release for exposure. After three years of the second stage of revision, the patient again presented to the orthopedic department after reportedly falling on a wet floor six weeks ago.

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