Enhanced computational prediction of polyethylene wear in hip joints by incorporating cross-shear and contact pressure in additional to load and sliding distance: Effect of head diameter |
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| Authors: | Lu Kang Alison L Galvin John Fisher Zhongmin Jin |
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| Institution: | 1. National Engineering Laboratory for Highway Maintenance Equipment, Chang''an University, 710064 Xi''an, Shaanxi, China;2. State Key Laboratory for Manufacturing System Engineering, School of Mechanical Engineering, Xi''an Jiaotong University, 710049 Xi''an, Shaanxi, China;3. Department of Arthroplasty Surgery, the Second Affiliated Hospital of Inner Mongolia Medical University, 010030 Hohhot, Inner Mongolia, China;4. Institute of Medical and Biological Engineering, School of Mechanical Engineering, University of Leeds, Leeds LS2 9JT, UK |
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| Abstract: | A new definition of the experimental wear factor was established and reported as a function of cross-shear motion and contact pressure using a multi-directional pin-on-plate wear testing machine for conventional polyethylene in the present study. An independent computational wear model was developed by incorporating the cross-shear motion and contact pressure-dependent wear factor into the Archard's law, in additional to load and sliding distance. The computational prediction of wear volume was directly compared with a simulator testing of a polyethylene hip joint with a 28 mm diameter. The effect of increasing the femoral head size was subsequently considered and was shown to increase wear, as a result of increased sliding distance and reduced contact pressure. |
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