Effect of Bone Quality and Leg Depth on the Biomechanical Performance of a Nitinol Staple.

Autor: Safranski DL; Director of Basic Research, MedShape, Inc., School of Materials Science and Engineering, Georgia Institute of Technology, Atlanta, GA. Electronic address: david.safranski@medshape.com., Chapman SC; Engineer, MedShape, Inc., Atlanta, GA., Wee ZR; Engineering Intern, Woodruff School of Mechanical Engineering, Georgia Institute of Technology, Atlanta, GA., Lareau CR; Foot and Ankle Surgeon, New England Orthopedic Surgeons, Springfield, MA., Ritter ZT; Chief, Podiatric Surgery, University of Pittsburgh Medical Center Susquehanna, Williamsport, PA., Seybold JD; Foot and Ankle Surgeon, Twin Cities Orthopedics, Edina, MN., Kwon JY; Chief, Division of Foot and Ankle Surgery, Harvard Medical School; Beth Israel Deaconess Medical Center, Boston, MA.
Jazyk: angličtina
Zdroj: The Journal of foot and ankle surgery : official publication of the American College of Foot and Ankle Surgeons [J Foot Ankle Surg] 2022 Jan-Feb; Vol. 61 (1), pp. 93-98. Date of Electronic Publication: 2021 Jun 22.
DOI: 10.1053/j.jfas.2021.06.013
Abstrakt: The use of Nitinol compression staples has increased in foot and ankle procedures due to their ease of delivery and ability to offer sustained, dynamic compression. Prior biomechanical studies have predominantly examined mechanical performance in healthy bone models without investigating the effect of unicortical versus bicortical fixation. The purpose of this study was to examine the effect of bone quality and staple leg depth on the biomechanical performance of Nitinol staples in a bicortical bone model. Two-legged Nitinol staples were implanted in bicortical sawbone of 2 densities. Two different leg depths were tested to simulate unicortical versus bicortical fixation. Interfacial compressive forces, interfacial compression area, torsional strength, and shear strength were measured for each group. The effect of leg depth was minimal compared to the effect of sawbone density on the mechanical performance of Nitinol staples. Interfacial compressive force and interfacial compression areas were greater in the low density bone model, while torsional strength and shear strength were greater in the normal density bone model. Nitinol staple's mechanical performance is highly dependent upon bone quality and less dependent on whether staple legs terminate in cancellous versus cortical bone. Low density bone allows for a higher compressive interfacial area to be imparted by the staple. Staples in normal density bone are able to resist torsion and shear deformation more readily than staples in low density bone. Bone density may have a greater effect on the Nitinol staple's stability and compressive capability in vivo as compared to unicortical versus bicortical leg fixation.
(Copyright © 2021 the American College of Foot and Ankle Surgeons. Published by Elsevier Inc. All rights reserved.)
Databáze: MEDLINE
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