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Technical Brief

Experimental Measurement of the Static Coefficient of Friction at the Ti–Ti Taper Connection in Total Hip Arthroplasty

[+] Author and Article Information
T. Bitter

Orthopaedic Research Laboratory,
Radboud University Medical Centre,
Geert grooteplein-zuid 10 (547),
Nijmegen 6500 HB,
The Netherlands
e-mail: Thom.Bitter@radboudumc.nl

I. Khan

Biomet UK Healthcare Ltd,
Murdock Road,
Dorcan Industrial Estate,
Swindon SN3 5HY, UK
e-mail: Imran.khan@biomet.com

T. Marriott

Biomet UK Healthcare Ltd,
Murdock Road,
Dorcan Industrial Estate,
Swindon SN3 5HY, UK
e-mail: Tim.marriott@biomet.com

B. W. Schreurs

Department of Orthopaedics,
Radboud University Medical Centre,
Nijmegen 6500 HB,
The Netherlands
e-mail: Wim.schreurs@radboudumc.nl

N. Verdonschot

Orthopaedic Research Laboratory,
Radboud University Medical Centre,
Geert grooteplein-zuid 10 (547),
Nijmegen 6500 HB,
The Netherlands
e-mail: Nico.Verdonschot@radboudumc.nl

D. Janssen

Orthopaedic Research Laboratory,
Radboud University Medical Centre,
Geert grooteplein-zuid 10 (547),
Nijmegen 6500 HB,
The Netherlands
e-mail: Dennis.Janssen@radboudumc.nl

1Corresponding author.

Manuscript received July 9, 2015; final manuscript received December 23, 2015; published online January 29, 2016. Assoc. Editor: Michael Detamore.

J Biomech Eng 138(3), 034505 (Jan 29, 2016) (5 pages) Paper No: BIO-15-1339; doi: 10.1115/1.4032446 History: Received July 09, 2015; Revised December 23, 2015

The modular taper junction in total hip replacements has been implicated as a possible source of wear. The finite-element (FE) method can be used to study the wear potential at the taper junction. For such simulations it is important to implement representative contact parameters, in order to achieve accurate results. One of the main parameters in FE simulations is the coefficient of friction. However, in current literature, there is quite a wide spread in coefficient of friction values (0.15 − 0.8), which has a significant effect on the outcome of the FE simulations. Therefore, to obtain more accurate results, one should use a coefficient of friction that is determined for the specific material couple being analyzed. In this study, the static coefficient of friction was determined for two types of titanium-on-titanium stem-adaptor couples, using actual cut-outs of the final implants, to ensure that the coefficient of friction was determined consistently for the actual implant material and surface finish characteristics. Two types of tapers were examined, Biomet type-1 and 12/14, where type-1 has a polished surface finish and the 12/14 is a microgrooved system. We found static coefficients of friction of 0.19 and 0.29 for the 12/14 and type-1 stem-adaptor couples, respectively.

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Figures

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Fig. 1

Taper types: left type-1, right 12/14

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Fig. 2

Cut out parts used in the experiments

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Fig. 3

Schematic of experimental setup

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Fig. 4

Coefficient of friction for type-1 and 12/14 at different contact pressures (*=p < 0.01)

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Fig. 5

Ra (average surface roughness) before and after loading, measured using Proscan 2100 noncontact profilometer according to ISO 4288:1996

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Fig. 6

Taper profile 12/14 before and after loading, measured using Proscan 2100 noncontact profilometer according to ISO 4288:1996

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Fig. 7

SEM images, left before loading right after loading. Top two rows T1 stem and adaptor, bottom two rows 12/14 stem and adaptor.

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