Strain Analysis in Cementless Hip Femoral Prosthesis using the Finite Element Method – Influence of the Variability of the Angular Positioning of the Implant^[*]

Abstract

Objective The present study aims to evaluate the influence of different positioning of the hip femoral prosthesis on the stress and strain over this implant.

Methods A femoral prosthesis (Taper - Víncula, Rio Claro, SP, Brazil) was submitted to a stress and strain analysis using the finite element method (FEM) according to the International Organization for Standardization (ISO) 7206-6 Implants for surgery – Partial and total hip joint prostheses – Part 6: Endurance properties testing and performance requirements of neck region of stemmed femoral components standard. The analysis proposed a branch of the physical test with a +/− 5° angle variation on the standard proposed for α and β variables.

Results The isolated +/− 5° variation on the α angle, as well as the association of +/− 5° variation on the α and β angles, presented significant statistical differences compared with the control strain (p = 0.027 and 0.021, respectively). Variation on angle β alone did not result in a significant change in the strain of the prosthesis (p = 0.128). The stem positioning with greatest implant strain was α = 5° and β = 14° (p = 0.032).

Conclusion A variation on the positioning of the prosthetic femoral stem by +/− 5° in the coronal plane and/or the association of a +/− 5° angle in coronal and sagittal planes significantly influenced implant strain.

Keywords

arthroplasty, replacement, hip - hip prosthesis - finite element analysis - equipment failure analysis

Financial Support

There was no financial support from public, commercial, or non-profit sources.

^* Study developed at Escola Paulista de Medicina, Universidade Federal de São Paulo, São Paulo, SP, Brazil.

Publication History

Received: 12 January 2021

Accepted: 12 April 2021

Article published online:
13 December 2021

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