Hard-on-hard total hip impingement causes extreme contact stress concentrations

Jacob M Elkins; Megan K O'Brien; Nicholas J Stroud; Douglas R Pedersen; John J Callaghan; Thomas D Brown

doi:10.1007/s11999-010-1632-x

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Hard-on-hard total hip impingement causes extreme contact stress concentrations

Journal article

Open access

Peer reviewed

Hard-on-hard total hip impingement causes extreme contact stress concentrations

Jacob M Elkins, Megan K O'Brien, Nicholas J Stroud, Douglas R Pedersen, John J Callaghan and Thomas D Brown

Clinical orthopaedics and related research, Vol.469(2), pp.454-463

02/2011

DOI: 10.1007/s11999-010-1632-x

PMCID: PMC3018221

PMID: 20953853

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Abstract

Impingement events, in addition to their role immediately proximate to frank dislocation, hold the potential to damage new-generation hard-on-hard bearings as a result of the relatively unforgiving nature of the materials and designs. Because of the higher stiffness and tighter design tolerances of metal-on-metal and ceramic implants, surgical positioning plausibly has become even more important. We asked (1) whether, and under what cup orientation conditions, hard-on-hard impingements might challenge implant material failure strength; and (2) whether particle generation propensity at impingement and egress sites would show similar dependence on cup orientation. Realistic computational simulations were enabled by multistage finite element analyses, addressing both global construct motion and loading, and focal stress concentrations at neck impingement and rim egress sites. The global model, validated by a cadaveric simulation in a servohydraulic hip simulator, included both hardware components and advanced anisotropic capsule characterization. Parametric computational runs explored the effect of cup orientation for both ceramic-on-ceramic and metal-on-metal bearing couples for two distinct motion sequences associated with dislocation. Stress concentrations from impingement increased nearly linearly with increased cup tilt and with cup anteversion. In some situations, peak values of stress approached or exceeded 1 GPa, levels challenging the yield strength of cobalt-chromium implants, and potentially the fracture strength of ceramics. The tendency for impingement events to generate debris, indexed in terms of a new scraping severity metric, showed orientation dependences similar to that for bulk material failure. Damage propensity arising from impingement events in hard total hip bearings is highly orientation-dependent.

Arthroplasty, Replacement, Hip - adverse effects

Biomechanical Phenomena

Computer Simulation

Finite Element Analysis

Hip Dislocation - etiology

Hip Dislocation - pathology

Hip Dislocation - physiopathology

Hip Joint - pathology

Hip Joint - physiopathology

Hip Joint - surgery

Hip Prosthesis

Humans

Prosthesis Design

Prosthesis Failure

Stress, Mechanical

Details

Title: Subtitle: Hard-on-hard total hip impingement causes extreme contact stress concentrations
Creators: Jacob M Elkins - University of Iowa
Megan K O'Brien
Nicholas J Stroud - University of Iowa
Douglas R Pedersen - University of Iowa
John J Callaghan - University of Iowa
Thomas D Brown - University of Iowa
Resource Type: Journal article
Publication Details: Clinical orthopaedics and related research, Vol.469(2), pp.454-463
DOI: 10.1007/s11999-010-1632-x
PMID: 20953853
PMCID: PMC3018221
ISSN: 0009-921X
eISSN: 1528-1132
Grant note: AR46601 / NIAMS NIH HHS UL1 RR024979 / NCRR NIH HHS R01 AR053553 / NIAMS NIH HHS R24 AR046601 / NIAMS NIH HHS AR53553 / NIAMS NIH HHS R01 AR046601 / NIAMS NIH HHS
Language: English
Date published: 02/2011
Academic Unit: Roy J. Carver Department of Biomedical Engineering; Orthopedics and Rehabilitation; Internal Medicine
Record Identifier: 9984304715602771

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