Eventos Anais de eventos
COBEM 2023
27th International Congress of Mechanical Engineering
ACTIVATION OF BONE MASS MAINTENANCE THROUGH INTRAMEDULLARY NAIL DYNAMIZATION
Submission Author:
Paulo Pedro Kenedi , RJ , Brazil
Co-Authors:
Jose Renato de Oliveira e Silva Neto, Paulo Pedro Kenedi, Rodrigo Ribeiro Pinho Rodarte, Lucas Vignoli
Presenter: Jose Renato de Oliveira e Silva Neto
doi://10.26678/ABCM.COBEM2023.COB2023-0889
Abstract
Diaphyseal fractures are very common in the elderly and may be related to low bone mineral density. Mechanical factors such as the magnitude of bone strain induced by load, and the number of daily load cycles are important in modeling and maintaining bone mass. However, the action of these mechanisms may slow down in elderly adults, if it is considered factors such as physical limitations or lack of ability to physical activity. Although the intramedullary nail is quite effective in stabilizing fractures, blocking this device can lead to an increase in difficulty in maintaining bone mass. The ANSYS finite element software was used to verify the levels of strain experienced by the diaphyseal cortex of a post-healing human femur bone through the actuation of a simple loading case. Three different materials of locked intramedullary nails were tested, dynamized or not. A linear regression curve proposed by Qin was used to combine strain peaks and the number of daily load cycles, comparatively, to estimate the combinations that could maintain bone mass. It was shown that the dynamization of a low-stiffness nail has the potential to reduce to half the number of daily load cycles necessary to maintain bone mass. These results may help in the decision to maintain, dynamize or even remove the nail after fracture stabilization.
Keywords
Intramedullary Nail, FE analysis, Strain shielding, Bone remodeling, Bone Mass Maintenance
