The influence of assembly on stem taper texture and measurement uncertainty

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

Characterisation of revised orthopaedic surfaces is recognised as an essential requirement for understanding long-term implant performance. Pre-wear data (from which to define material loss) is not often available, so this must be reconstructed by mathematically modelling a small amount of as-manufactured surface. This paper examines the influence of the surgical assembly process and taper design on the contact deformation of CoCrMo head tapers and threaded Ti-6Al-4V stem tapers, and hence how reliable these surfaces are when used for the reconstruction of a pre-implantation surface. Three implant cohorts (n=5) of differing design were measured in an as-manufactured condition, then assembled, dis-assembled, and re-measured. Measurements were aligned using a validated procedure and deformation quantified in terms of amplitude and volume. No damage or imprinting was evident on the head taper bore, but surface texture compression could be more prevalent in stem taper designs with larger surface texture height. Based on the reviewed cohort of implants, the maximum error contribution to volume of material loss was <0.4mm3.

Original languageEnglish
Title of host publicationEuropean Society for Precision Engineering and Nanotechnology, Conference Proceedings - 19th International Conference and Exhibition, EUSPEN 2019
EditorsRichard K. Leach, D. Billington, C. Nisbet, D. Phillips
Publishereuspen
Pages530-531
Number of pages2
ISBN (Electronic)9780995775145
Publication statusPublished - 2019
Event19th International Conference of the European Society for Precision Engineering and Nanotechnology - Euskalduna, Bilbao, Spain
Duration: 3 Jun 20197 Jun 2019
Conference number: 19
https://www.euspen.eu/events/19th-ice-bilbao/

Conference

Conference19th International Conference of the European Society for Precision Engineering and Nanotechnology
Abbreviated titleEUSPEN 2019
CountrySpain
CityBilbao
Period3/06/197/06/19
Internet address

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  • Cite this

    Dransfield, K., Racasan, R., Williamson, J., Blunt, L., & Bills, P. (2019). The influence of assembly on stem taper texture and measurement uncertainty. In R. K. Leach, D. Billington, C. Nisbet, & D. Phillips (Eds.), European Society for Precision Engineering and Nanotechnology, Conference Proceedings - 19th International Conference and Exhibition, EUSPEN 2019 (pp. 530-531). euspen.