Study of Contact Parameters in Metal-on-plastic Hip Endoprothesis with a New Analytical Method of Contact Mechanics


The author presents a computational approach for estimating contact characteristics (i.e., maximum contact pressures, angle, and diameter of contact) in thermo-diffusion nitrided (TDN) Grade 2 and ultra-high molecular weight polyethylene hip prostheses (UHMWPE). The impact of hip joint stress, prosthesis head diameter, and radial clearance on the above contact parameters has been examined. The relationships between maximum contact pressures and the contact parameters given above are determined. A linear increase in contact pressure is caused by increasing radial clearance and endoprosthesis loading. However, when the head diameter grows, the contact pressure decreases in a non-linear manner. The contact diameter grows in lockstep with the head diameter. The Young’s modulus of UHMWPE has been shown to vary by up to three times. As a result, the impact of Young’s modulus and Poisson’s ratio on the maximum contact pressure was investigated. The endoprosthesis with non-spherical surfaces of its elements was also examined using the approach (Alpharabola geometry). The impact of a head departure from sphericity in the shape of an oval on contact pressure, contact angle, and contact diameter was investigated. This geometry’s beneficial properties were discovered.

Author(s) Details

Myron Chernets
Aerospace Faculty, National Aviation University, 03680 Kyiv, Ukraine.

Jaroslaw Zubrzycki
Faculty of Mechanical Engineering, Lublin University of Technology, 20-618 Lublin, Poland.

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