Cross-shear implementation in sliding-distance-coupled finite element analysis of wear in metal-on-polyethylene total joint arthroplasty: intervertebral total disc replacement as an illustrative application.
Computational simulations of wear of orthopaedic total joint replacement implants have proven to valuably complement laboratory physical simulators, for pre-clinical estimation of abrasive/adhesive wear propensity. This class of numerical formulations has primarily involved implementation of the Archard/Lancaster relationship, with local wear computed as the product of (finite element) contact stress, sliding speed, and a bearing-couple-dependent wear factor. The present study introduces an augmentation, whereby the influence of interface cross-shearing motion transverse to the prevailing molecular orientation of the polyethylene articular surface is taken into account in assigning the instantaneous local wear factor. The formulation augment is implemented within a widely utilized commercial finite element software environment (ABAQUS). Using a contemporary metal-on-polyethylene total disc replacement (ProDisc-L) as an illustrative implant, physically validated computational results are presented to document the role of cross-shearing effects in alternative laboratory consensus testing protocols. Going forward, this formulation permits systematically accounting for cross-shear effects in parametric computational wear studies of metal-on-polyethylene joint replacements, heretofore a substantial limitation of such analyses.
Goreham-Voss
Curtis M
CM
Department of Orthopaedics and Rehabilitation, University of Iowa, Iowa City, IA 52242, USA.
Hyde
Philip J
PJ
Hall
Richard M
RM
Fisher
John
J
Brown
Thomas D
TD
D017076:Computer-Aided Design; D055119:Elastic Modulus; D019544:Equipment Failure Analysis; D020342:Finite Element Analysis; D017276:Friction; D006801:Humans; D007405:Intervertebral Disc Displacement / Q000601:surgery*; D007595:Joint Prosthesis; D008422:Materials Testing; D008670:Metals / Q000737:chemistry*; D020959:Polyethylene / Q000737:chemistry*; D011474:Prosthesis Design; D033081:Shear Strength; D013499:Surface Properties
D008670:Metals; D020959:Polyethylene
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