Effects of implant positioning in cementless total hip replacements

Bah, M.T., Browne, Martin, Young, P.G., Bryan, R. and Xuan, V.B. (2011) Effects of implant positioning in cementless total hip replacements. Computer Methods in Biomechanics and Biomedical Engineering, 14, supplement 1, 275-276. (doi:10.1080/10255842.2011.595241).

Abstract

Cementless Total Hip Replacements (THRs) are required to approximate as closely as possible the natural joint function for the full postoperative life span. Unfortunately, implant positioning is not always perfect due to the curved shape of the thigh bone and the stem is often straight [1]. Surgeons need to decide on three orientation angles that directly influence the success of a cementless THR: the antero/retro version of the femur neck orientation, implant varus/valgus placement and anterior/posterior orientation. Ideally, to account for positioning variability, all possible implant orientations should be analysed and simulated. Unfortunately, this would be an intractable task if it was attempted experimentally, and computational simulations are often applied to reduce this burden. However, even in computational pre-clinical assessments of implant primary stability, this is a huge task, as it involves generating a new mesh for each new position and solving the corresponding Finite Element (FE) problem [2]. In the current work, this problem is addressed using a mesh morphing-based framework that can efficiently assess the effects of implant positioning.

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Contributors

Author: Martin Browne

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