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Further examinations should be done concerning the influence of weakness, betterreproducibility and especially fatigue loading.REFERENCES:[1] Beaver RJ et al., Proc. 7 th BIOLOX ® Symposium, 65-71, 2002FiguresPoster: 77Influence of Impacting Ceramic Inserts on Proper Seating in AcetabularCups for Hip ImplantsINTRODUCTION:*Thomas Pandorf - CeramTec AG - Plochingen, GermanyRoman Preuss - CeramTec AG - Plochingen, GermanyHendrik Bertmaring - CeramTec AG - Plochingen, Germany*Email: t.pandorf@ceramtec.decThe advantage of a modular system is that the surgeon is able to choose the metal cup andinsert to adapt the implant system to the individual needs of a patient. During preoperativeplanning an appropriate combination is chosen. During surgery facing deviant conditions it ispossible to change decision choosing another insert size or material. Beside the benefitdisadvantages exist caused by a modular connection technique. The ceramic insert isrecommended as being manually assembled during surgery into a dry and clean metal cup bypushing it in along the metal taper. Furthermore, a slight axial tap using a plastic impactorshould be applied onto the insert to assure a secure connection. According to investigationsrelated to current surgical practice, it has been found that during the intraoperative assembly ofinsert and metal cup, the forces applied by the surgeon show a large deviation. In some cases,the surgeons even avoided the impaction 1 . In some cases surgeons even avoided the impaction.Under in-vivo conditions adhesion forces generated between ball head and insert due to thesynovia fluid might transfer tension forces between ball head and inserts. Occurring microseparation of the head consequently leads to pull-out loading of the insert.This study shows the importance of a slight axial tap for a secure connection by examining theeffects of occurring adhesion between ball head and insert.METHODS:file:///E|/ISTA2010-Abstracts.htm[12/7/2011 3:15:47 PM]