Influence of ingrowth regions on bone remodelling around a cementless hip resurfacing femoral implant

Ifaz T. Haider, Andrew D. Speirs, Paul E. Beaulé and Hanspeter Frei

Computer Methods in Biomechanics and Biomedical Engineering, 2015, vol. 18, issue 12, 1349-1357

Abstract: 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.

Date: 2015
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DOI: 10.1080/10255842.2014.903931

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