Biomechanical, morphological, and histological analysis of early failures in hip resurfacing arthroplasty

Medientyp: E-Artikel
Titel: Biomechanical, morphological, and histological analysis of early failures in hip resurfacing arthroplasty
Beteiligte: Morlock, Michael [Verfasser:in]; Bishop, Nicholas [Verfasser:in]; Rüther, Wolfgang [Verfasser:in]; Delling, Günter [Verfasser:in]; Hahn, Michael [Verfasser:in]
Körperschaft: Technische Universität Hamburg-Harburg ; Technische Universität Hamburg-Harburg, Arbeitsbereich Biomechanik
Erschienen: 2006
Erschienen in: Institution of Mechanical Engineers: Proceedings of the Institution of Mechanical Engineers. Part H, Journal of engineering in medicine ; 220(2006), 2, Seite 333-344
Sprache: Englisch
DOI: 10.1243%2F095441105X69015; 10.15480/882.1547
Identifikator:

Schlagwörter: Aged ; Arthroplasty, Hip Replacement ; Biomechanical Phenomena ; Equipment Failure Analysis ; Female ; Femoral Fractures ; Femur Head ; Femur Head Necrosis ; Hip Prosthesis ; Humans ; Male ; Middle Aged ; Surface Properties ; Treatment Outcome ; Prosthesis Failure
Entstehung:
Anmerkungen: The manuscript was received on 6 October 2005
Beschreibung: The 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.
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