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Hip simulator testing of the taper-trunnion junction and bearing surfaces of contemporary modular metal-on-cross-linked polyethylene hip prostheses

Lookup NU author(s): Rohan Bhalekar, Dr Simon Smith, Professor Tom Joyce

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This is the final published version of an article that has been published in its final definitive form by John Wiley & Sons, Inc., 2020.

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Abstract

Adverse reaction to metal debris released from the taper-trunnion junction of modular metal-on-polyethylene (MoP) total hip replacements (THRs) is an issue of contemporary concern. Therefore, a hip simulator was used to investigate material loss, if any, at both the articulating and taper-trunnion surfaces of five 32mm metal-on-cross-linked-polyethylene (MoXLPE) THRs for 5 million cycles (Mc) with a sixth joint serving as a dynamically loaded soak control. Commercially available cobalt-chromium-molybdenum (CoCrMo) femoral heads articulating against XLPE acetabular liners were mounted on 12/14 titanium (Ti6Al4V) trunnions. Weight loss (mg) was measured gravimetrically and converted into volume loss (mm³) for heads, liners and trunnions at regular intervals. Additionally, post-test volumetric wear measurements of the femoral tapers were obtained using a coordinate measuring machine (CMM). The surface roughness (Sa) of femoral tapers was measured post-test. After 5Mc, the mean volumetric wear rate for XLPE liners was 2.74±0.74 mm³/Mc. The CMM measurements confirmed material loss from the femoral taper with the mean volumetric wear rate of 0.045±0.024 mm³/Mc. The Sa on the worn area of the femoral taper showed a significant increase (p<0.001) compared to the unworn area. No other long term hip simulator tests have investigated wear from the taper-trunnion junction of contemporary MoP THRs.

Publication metadata

Author(s): Bhalekar RM, Smith SL, Joyce TJ

Publication type: Article

Publication status: Published

Journal: Journal of Biomedical Materials Research Part B: Applied Biomaterials

Year: 2020

Volume: 108

Issue: 1

Pages: 156-166

Print publication date: 01/01/2020

Online publication date: 29/03/2019

Acceptance date: 11/03/2019

Date deposited: 07/05/2019

ISSN (print): 1552-4973

ISSN (electronic): 1552-4981

Publisher: John Wiley & Sons, Inc.

URL: https://doi.org/10.1002/jbm.b.34374

DOI: 10.1002/jbm.b.34374

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