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Evaluating the accuracy of wear formulae for acetabular cup liners

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Abstract

This study proposes two methods for exploring the wear volume of a worn liner. The first method is a numerical method, in which SolidWorks® software is used to create models of the worn out regions of liners at various wear directions and depths. The second method is an experimental one, in which a machining center is used to mill polyoxymethylene to manufacture worn and unworn liner models, then the volumes of the models are measured. The results show that the SolidWorks® software is a good tool for presenting the wear pattern and volume of a worn liner. The formula provided by Ilchmann is the most suitable for computing liner volume loss, but is not accurate enough. This study suggests that a more accurate wear formula is required. This is crucial for accurate evaluation of the performance of hip components implanted in patients, as well as for designing new hip components.

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Acknowledgments

The authors would like to thank the National Science Council of the Republic of China, Taiwan, for financially supporting this research under Contract No. NSC96-2221-E-040-008-MY2.

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Authors and Affiliations

  1. Institute of Mechanical Engineering, National Chung Hsing University, Taichung, Taiwan, ROC

    James Shih-Shyn Wu & Shu-Ling Hsu

  2. Department of Orthopedics, Chung Shan Medical University Hospital, Taichung, Taiwan, ROC

    Jian-Horng Chen

  3. School of Physical Therapy, Chung Shan Medical University, 110, Sec. 1, Jianguo N. Rd., Taichung, Taiwan, ROC

    Jian-Horng Chen

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  1. James Shih-Shyn Wu
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  2. Shu-Ling Hsu
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  3. Jian-Horng Chen
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Correspondence to Jian-Horng Chen.

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Wu, J.SS., Hsu, SL. & Chen, JH. Evaluating the accuracy of wear formulae for acetabular cup liners. Med Biol Eng Comput 48, 157–165 (2010). https://doi.org/10.1007/s11517-009-0535-z

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