Siebel, ThomasThomasSiebelMaubach, StefanStefanMaubachMorlock, MichaelMichaelMorlock2018-03-202018-03-202006-02Proceedings of the Institution of Mechanical Engineers. Part H, Journal of engineering in medicine 2 (220): 345-353 (2006-02)http://tubdok.tub.tuhh.de/handle/11420/1594Between August 2003 and April 2005, 300 ASR metal-on-metal resurfacing hip endoprostheses were implanted by the first author and a fellow surgeon. The mean age at surgery was 56.8 years (18-75.9 years) and mean body mass index was 27.6 kg/m2 (range, 19-41 kg/m2). The mean follow-up time was 202 days. The mean Harris hip score improved from 44 pre-operatively to 89 at 3 months post-operatively. In total, eight (2.7 per cent) cases [five neck fractures (1.66 per cent) and three cup revisions (1 per cent)] were revised. Two neck fractures occurred within a group of seven cases of femoral neck notching detected postoperatively; one neck fracture occurred out of two cases of incomplete seating of the femoral implant. A significantly higher (p < 0.001) failure rate was observed for patients who had undergone a previous osteosynthesis of the proximal femur (three revisions in a group of 15 patients). Revision cases had a significantly greater body mass index (p = 0.031). A learning curve was evident from the reduction in revisions from 5 in the first 100 surgical procedures to 2 in the next 100 and 1 in the last 100. These results show the importance of accurate surgical technique and careful patient selection for fourth-generation hip resurfacing implants.en2041-3033Proceedings of the Institution of Mechanical Engineers. Part H, Journal of engineering in medicine20062345353Sage Publicationshttp://rightsstatements.org/vocab/InC/1.0/AdolescentAdultAgedArthroplasty, Replacement, HipComorbidityEquipment Failure AnalysisFemaleFemoral FracturesFemur Head NecrosisGermanyHumansIncidenceMaleMiddle AgedProsthesis FailureProsthesis-Related InfectionsReoperationRisk AssessmentRisk FactorsSurface PropertiesTreatment OutcomeMedizinLessons learned from early clinical experience and results of 300 ASR hip resurfacing implantationsJournal Articleurn:nbn:de:gbv:830-8821996410.15480/882.159111420/159410.1243/095441105X6907910.15480/882.1591Dieser 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.Other