Influence of ingrowth regions on bone remodelling around a cementless hip resurfacing femoral implant.
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.
a Department of Mechanical and Aerospace Engineering , Carleton University , 3135 Mackenzie Bldg, 1125 Colonel By Dr, Ottawa , ON , Canada K1S 5B6.
Ifaz T
IT
Haider
Andrew D
AD
Speirs
Paul E
PE
Beaulé
Hanspeter
H
Frei
D001178:Arthroplasty / Q000379:methods*; D001696:Biomechanical Phenomena; D016723:Bone Remodeling / Q000502:physiology*; D001862:Bone Resorption / Q000503:physiopathology; D005269:Femur / Q000601:surgery*; D020342:Finite Element Analysis; D017276:Friction / Q000502:physiology; D006622:Hip Prosthesis; D006801:Humans
bone remodelling; finite element analysis; hip resurfacing arthroplasty; interface conditions