Designing an optimized novel femoral stem

Parto Babaniamansour, Mehdi Ebrahimian-Hosseinabadi, Anousheh Zargar-Kharazi

Abstract


Background: After total hip arthroplasty, there would be some problems for the patients. Implantloosening is one of the significant problems which results in thigh pain and even revision surgery.Difference between Young’s modulus of bone-metal is the cause of stress shielding, atrophy, andsubsequent implant loosening. Materials and Methods: In this paper, femoral stem stiffness is reducedby novel biomechanical and biomaterial design which includes using proper design parameters, coatingit with porous surface, and modeling the sketch by the software. Parametric design of femoral stem isdone on the basis of clinical reports. Results: Optimized model for femoral stem is proposed. Curvedtapered stem with trapezoidal cross-section and particular neck and offset is designed. Fully poroussurface is suggested. Moreover, Designed femoral stem analysis showed the Ti6Al4V stem which iscovered with layer of 1.5mm in thickness and 50% of porosity is as stiff as 77 GPa that is 30% less thanthe stem without any porosity. Porous surface of designed stem makes it fix biologically; thus, prosthesisloosening probability decreases. Conclusion: By optimizing femoral stem geometry (size and shape)and also making a porous surface, which had an intermediate stiffness of bone and implant, a moreefficient hip joint prosthesis with more durability fixation was achieved due to better stress transmissionfrom implant to the bone.

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