Numerical Simulation of an Intramedullary Elastic Nail: Expansion Phase and Load-Bearing Behavior.

Authors:
elisabetta zanetti
elisabetta zanetti
Università degli Studi di Perugia
Assistant Professor
biomechanics, biomaterials
Perugia, Umbria | Italy

Front Bioeng Biotechnol 2018 21;6:174. Epub 2018 Nov 21.

Department of Engineering, University of Perugia, Perugia, Italy.

The Marchetti-Vicenzi's nail is an intramedullary device where six curved nails are kept straight by a closing ring in order to allow their insertion into the medullary canal of a long bone; in a following step, these nails stabilize the fracture due to the ring withdrawal and to the consequent elastic expansion of the nails. Pre-clinical testing of this sort of device is strongly advocated in order to be able to foresee their stability inside the medullary canal and to quantify their stiffening action on a broken bone. In this numerical work, an MB (Multi Body) model of the device has been developed, with the dual purpose of evaluating forces between the bone and the system components during its progressive opening and verifying the behavior of the stabilized bone when it undergoes external loading. Different solutions, for flexible body modeling (discretization with lumped parameters, "flexible body," "FE Part"), have been analyzed and compared in terms of accuracy of results and required computational resources. Contact parameters have been identified and criteria to simplify geometries and therefore to reduce simulation times have been given. Results have allowed to demonstrate how a moderate lateral force is able to dislocate the fracture and how the final position of the retention nut can be optimized. On the whole, a tool for the pre-clinical testing of elastic intramedullary nails has been given.

Download full-text PDF

Source
http://dx.doi.org/10.3389/fbioe.2018.00174DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC6258715PMC
November 2018
10 Reads

Article Mentions


Provided by Crossref Event Data
twitter
Twitter: Visitor_z
December 2, 2018, 12:21 pm EST
twitter
Twitter: FrontBioeng
November 21, 2018, 12:44 pm EST

Publication Analysis

Top Keywords

medullary canal
8
pre-clinical testing
8
behavior stabilized
4
stabilized bone
4
verifying behavior
4
progressive opening
4
system components
4
components progressive
4
bone undergoes
4
opening verifying
4
undergoes external
4
body modeling
4
modeling discretization
4
discretization lumped
4
flexible body
4
solutions flexible
4
external loading
4
loading solutions
4
bone system
4
forces bone
4

References

(Supplied by CrossRef)
A biomechanical study of the stability of titanium elastic nails in the treatment of oblique segmental fracture of the femur in children
Abosala et al.
Internet J. Orthop. Surg. 2011

2013

Court-Brown et al.
1991

Dutta et al.
2008

Hessmann et al.
2015
The kuntscher method of intramedullary fixation
Kuntscher et al.
J. Bone Joint Surg. Am. 1958

Similar Publications