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11/12. Localized chronic suppurative bone infection as a sequel of peri-implantitis in a hydroxyapatite-coated dental implant.

    Plaque-induced lesions can produce peri-implant bone loss with ultimate implant loss. Although the peri-implant tissues seem to be more resistant than the periodontal ones to plaque and calculus, they can produce a more extensive spread of the infection to the deeper tissues around implants. The case of a 45-year-old female patient is presented in which, over a three year period, there was a progressive loss of peri-implant bone and the formation of a periapical radiolucency with an external fistula. The implant was removed and examined with the cutting-grinding system. microscopy examination showed that most of the hydroxyapatite (HA) was still adherent to the metal. There was a detachment in the area of the HA-titanium interface. The implant surface was almost completely covered by bacteria. bacteria were also present in the bone medullary spaces surrounding the implant. The infection of the periodontal tissues had progressed into the alveolar bone, thus producing a localized bone infection. The cause of the implant failure is probably related to a defective connection of the abutment or to overloading of the implant due to the presence of interlocks in the prosthetic restoration.
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keywords = metal
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12/12. Technique for removal of femoral components with intercondylar articulation in total knee arthroplasty.

    Total knee revision arthroplasty is a challenging and demanding procedure. Removal of well-fixed implants must be done meticulously to preserve bone stock. The presence of intercondylar geometries compounds this problem because the cement-metal interface is inaccessible. The authors present a new technique for approaching this region using a high speed metal cutting burr, thus effectively preserving bone stock in the distal femur.
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keywords = metal
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