Morlock, MichaelMichaelMorlockBishop, NicholasNicholasBishopRüther, WolfgangWolfgangRütherDelling, GünterGünterDellingHahn, MichaelMichaelHahn2018-02-262018-02-262006-02Proceedings of the Institution of Mechanical Engineers. Part H, Journal of engineering in medicine 2 (220): 333-344 (2006)http://tubdok.tub.tuhh.de/handle/11420/1550The present revival of hip resurfacing arthroplasty may be related to an increase in early failures owing to the challenging technique of the procedure. Fifty-five retrieved implants were analysed with respect to wear, cement mantle and cement penetration, fracture and head morphology, as well as standard histology. Femoral neck fractures occurred in median after 102 days. The time to failure was shorter for older women. Major deviations from the suggested cement mantle thickness and cement penetration were found. Indications for high trauma during implantation leading to early failure due to weakening of the femoral neck were also observed. Some failures had signs of pseudarthrosis beneath the implant. Four different fracture patterns with different mean survival times were identified. Observed wear was minor with the exception of that due to alignment mistakes (rim loading). The cups were not damaged by the failures. Histological results indicate that avascular necrosis is not necessarily connected with this kind of endoprosthetic surgery. Most of the failures analysed can probably be attributed to the 'learning curve' effect, which is an unsatisfactory situation.en2041-303320062333344Sage Publ.http://rightsstatements.org/vocab/InC/1.0/AgedArthroplasty, Hip ReplacementBiomechanical PhenomenaEquipment Failure AnalysisFemaleFemoral FracturesFemur HeadFemur Head NecrosisHip ProsthesisHumansMaleMiddle AgedSurface PropertiesTreatment OutcomeProsthesis FailureMedizinJournal Articleurn:nbn:de:gbv:830-8821891710.15480/882.154711420/155010.1243/095441105X6901510.15480/882.1547Dieser Beitrag ist mit Zustimmung des Rechteinhabers aufgrund einer (DFG geförderten) Allianz- bzw. Nationallizenz frei zugänglich. This publication is with permission of the rights owner freely accessible due to an Alliance licence and a national licence (funded by the DFG, German Research Foundation) respectively.Journal Article