High speed insertion of bone fracture fixation pins: a finite element penetration model with experimental comparisons |
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Authors: | Prygoski Matthew P Pasang Timotius Schmid Steven R Lozier Antony J |
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Affiliation: | (1) Department of Aerospace and Mechanical Engineering, University of Notre Dame, 150 Multidisciplinary Research Building, Notre Dame, IN 46637, USA;(2) Department of Mechanical and Manufacturing Engineering, AUT University, Auckland, New Zealand;(3) Zimmer Inc., Warsaw, Indiana, USA; |
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Abstract: | A new method of bone fracture fixation is considered in which small pins/darts are dynamically inserted into bone to prevent
translation and rotation at the fracture site. An ABAQUS model was developed to analyze dart penetration in cortical and cancellous
bone for varying dart diameter, material, and velocity, and cortical thickness. The method is advocated for bioresorbable
darts, so polylactide (PLA) and magnesium are the materials examined in this study. Numerical results showed that magnesium
darts can achieve full penetration in bone while suffering little damage. The PLA darts penetrated thin bone well, but substantial
deformation was seen as the cortical thickness increased, especially for small diameter darts. As partial validation, prototype
PLA fixation darts were fired into cadaveric bone with a custom nailer. As in the model, the PLA darts could penetrate thin
cortices but saw gross deformation when impacted against thicker bone. |
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