Hip resurfacing arthroplasty is an alternative to traditional hip replacement that can conserve proximal bone stock and has gained popularity but bone resorption may limit implant survival and remains a clinical concern. The goal of this study was to analyze bone remodelling patterns around an uncemented resurfacing implant and the influence of ingrowth regions on resorption. A computed tomography-derived finite element model of a proximal femur with a virtually implanted resurfacing component was simulated under peak walking loads. Bone ingrowth was simulated by six interface conditions: fully bonded; fully friction; bonded cap with friction stem; a small bonded region at the stem-cup intersection with the remaining surface friction; fully frictional, except for a bonded band along the distal end of the cap and superior half of the cap bonded with the rest frictional. Interface condition had a large influence on remodelling patterns. Bone resorption was minimized when no ingrowth occurred at the bone-implant interface. Bonding only the superior half of the cap increased bone resorption slightly but allowed for a large ingrowth region to improve secondary stability.

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Keywords bone remodelling, finite element analysis, hip resurfacing arthroplasty, interface conditions
Persistent URL dx.doi.org/10.1080/10255842.2014.903931
Journal Computer Methods in Biomechanics and Biomedical Engineering
Haider, I.T. (Ifaz T.), Speirs, A, Beaulé, P.E. (Paul E.), & Frei, H. (2015). Influence of ingrowth regions on bone remodelling around a cementless hip resurfacing femoral implant. Computer Methods in Biomechanics and Biomedical Engineering, 18(12), 1349–1357. doi:10.1080/10255842.2014.903931