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for the follow-up examination. A telephone interview and the WOMAC did not reveal anycomplication in their cases.ResultsThe mean Merle d’Aubigné and Harris scores increase from 9.8 to 16.3 and from 37.4 to 79.9,respectively. The UCLA score improves from 4.2 to 6.5. The corrected WOMAC is 77.2%. Butthe results after 1 year show a distinct difference between the first 30 patients (Harris score of58.2) and the subsequent patients (Harris score of 82.4). The radiographic analysis does notshow any migration; the observed radiolucencies, whether around the fixation wings or at thelevel of the surface coating, are not progressive; mean cup inclination is 52°.The mean values for chrome are 1.95 µg/l and for cobalt 2 µg/l.Discussion and conclusionThis study confirms the relevance of this concept with regard to stability (no dislocations) andfunctional result, and reveals no particular complication. The less good clinical results are to beattributed to the pain previously noted in the first 30 cases, before our technical experience ledus to impact an undersized cup in respect to the last used rasp. This technique enables a bettercentering of the cup, ensures that the latter does not protrude nor expose it to excessiveequatorial compression, which seems to cause pain. We have no doubt that it is this technicalmodification that has spared us the complications that have led some of our colleagues toabandon this type of implant.Thursday, October 7, 2010, 16:50-17:40Session B8: Management of Complications in TKASurface Treating of Endoprostheses by Stitching-in Silver*Paul Unwin - Stanmore Implants Worldwide - Stanmore, EnglandMartin Pickford - Accentus Medical Ltd - Didcot, UKJames Shawcross - Accentus Medical Ltd - Didcot, UKGordon Blunn - Royal National Orthopaedic Hospital - London, UKSteve Cannon - Royal National Orthopaedic Hospital - London, UKRobert Grimer - Royal Orthopaedic Hospital - Birmingham, UK*Email: paul.unwin@stanmoreimplants.comInfected mega-endoprostheses are difficult to treat with systemic antibiotics due toencapsulation of the implant by fibrous tissue, formation of biofilms and antibiotic resistantbacteria. Modifying the implant surface by incorporating a bactericidal agent may reduceinfection. Infection rates are typically in the range of 8% to 30%. This study describes a novelprocess method of “stitching-in” ionic silver into the implant surface, in vitro testing and itsearly clinical usage.file:///E|/ISTA2010-Abstracts.htm[12/7/2011 3:15:47 PM]