Strain Analysis in Cementless Hip Femoral Prosthesis using the Finite Element Method - Influence of the Variability of the Angular Positioning of the Implant.
Rev Bras Ortop (Sao Paulo)
; 57(6): 968-974, 2022 Dec.
Article
em En
| MEDLINE
| ID: mdl-36540742
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 ß variables. Results The isolated +/- 5° variation on the α angle, as well as the association of +/- 5° variation on the α and ß angles, presented significant statistical differences compared with the control strain ( p = 0.027 and 0.021, respectively). Variation on angle ß 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 ß = 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.
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2022
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Article