Polyvinyl Siloxane Molds for Nondestructive Surface Feature Metrology of Failed Joint Prostheses
A nondestructive polyvinyl siloxane (PVS) impression protocol was developed for studying the surface features on joint prostheses with modular junctions after they have been removed from patients. Analysis of the failed joint prostheses reveals that modular junctions consisting of bore-cone tapers can be the site of in vivo fretting and crevice corrosion. While cone taper surfaces are readily analyzed by non-contact profilometric techniques, bore taper surfaces are inaccessible for direct observation. An indirect repeatable method to analyze these inaccessible surfaces was developed, incorporating a commonly used dental impression polymer to achieve a high-detail negative of the bore taper suitable for profilometric measurements. Compared to the actual bore surface, light-viscosity PVS adequately replicated surface features for statistically similar measurements of metrological mean roughness parameters (Sa, Sq), peak-to-valley height parameters (Sz), shape parameters (Ssk, Sku), and spatial parameters (Sm). Surface features as fine as 2.6 μm in size were reproduced, indicating that this technique is applicable to failure analysis studies involving abrasive wear, adhesive wear, and corrosion pits. This indirect and nondestructive method of surface damage analysis can be broadly applied in many industries requiring analysis of inaccessible surfaces, such as machined bores, inner surfaces of pipes, and large parts incompatible with laboratory metrology equipment.
KeywordsBiomaterials Corrosion failure analysis Implant Nondestructive examination
This work was supported by the Clemson University Faculty Start-Up Fund. Explanted prostheses were provided by Jörg Lützner, MD.
- 3.C.S. Helms, A.S. Greenwald, The rationale and performance of modularity in total knee arthroplasty. Orthopaedics 28(9), s1113-5 (2005)Google Scholar
- 4.J.D. Bobyn, M. Tanzer, J.J. Krygier, A.R. Dujovne, C.E. Brooks, Concerns with modularity in total hip arthroplasty. Clin. Orthop. Relat. Res. 298, 27–36 (1994)Google Scholar
- 6.Standard Guide for Assessment of Surface Texture of Non-Porous Biomaterials in Two Dimensions, F2791-09, Annual Book of ASTM Standards, vol. 13.02, ASTM International, West ConshohockenGoogle Scholar
- 8.Standard Guide for Characterization of Wear from the Articulating Surfaces in Retrieved Metal-on-Metal and other Hard-on-Hard Hip Prostheses, F2979-14, Annual Book of ASTM Standards, vol. 13.02, ASTM International, West ConshohockenGoogle Scholar
- 11.Dental Elastomeric Impression Material, Section 5.11 Detail Reproduction, ISO 4823-2000, International Standards OrganizationGoogle Scholar
- 14.A.B. Meireles, E.B. Las Casas, G.C. de Godoy, T.O. de Ornelas, T.P.M. Cornacchia, in Proceedings of the 21st Brazilian Congress of Mechanical Engineering, 24–28 Oct 2011, Natal, RN, Brazil, ABCM, 2011Google Scholar
- 15.Geometrical Product Specifications (GPS)—Surface Texture: Profile Method—Terms, Definitions and Surface Texture Parameters,ISO 4287:1997, International Standards OrganizationGoogle Scholar
- 16.Geometrical Product Specifications (GPS)—Surface Texture: Profile Method—Metrological Characteristics of Phase Correct Filters, ISO 11562:1996, International Standards OrganizationGoogle Scholar