Analysis of the Fracture Mechanism of Ti-6Al-4V Alloy Rods That Failed Clinically After Spinal Instrumentation Surgery

Spine
Kenta YamanakaAkihiko Chiba

Abstract

Retrieval analysis of 2 Ti-6Al-4V alloy rods that fractured after spinal instrumentation surgery. To determine the mechanism that underlies fractures of Ti-6Al-4V alloy rods after spinal instrumentation surgery from a materials science viewpoint. Rod failures after spinal instrumentation surgery are often reported and many case-based studies have been published. However, the details of the mechanism that underlies the fractures have not yet been fully elucidated. Two patients, a 71-year-old female and an 11-year-old male, underwent radiography and removal of their fractured rods. The latter patient had been treated using the growing-rod method. Metallurgical failure analysis of the retrieved rods was conducted, and material properties were compared between the unused and fractured rods. The microstructures and mechanical properties of the Ti-6Al-4V alloy rods that failed after spinal instrumentation surgery were similar to those of unused rods. Analysis of the fracture surfaces clearly identified fatigue cracking in both cases that would have lowered the resistance of the rods to failures caused by external stresses. Shot blasting the surfaces of Ti-6Al-4V alloy rods and bending the rods to fit particular contours, which is alw...Continue Reading

References

Jul 4, 2006·Spine·Colleen LindseyChristian M Puttlitz
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Mar 25, 2011·Proceedings of the Institution of Mechanical Engineers. Part H, Journal of Engineering in Medicine·T-Q NguyenV Deviren
Jul 9, 2011·Spine·Justin S YangUNKNOWN Growing Spine Study Group
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Sep 17, 2013·Journal of Orthopaedic Science : Official Journal of the Japanese Orthopaedic Association·Tsutomu AkazawaShohei Minami

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Citations

Jan 17, 2016·Journal of the Mechanical Behavior of Biomedical Materials·Kenta YamanakaAkihiko Chiba
Dec 29, 2015·The Spine Journal : Official Journal of the North American Spine Society·Conor S JonesMichael Hutton
Aug 9, 2016·Journal of the Mechanical Behavior of Biomedical Materials·Manami MoriAkihiko Chiba
Jan 20, 2017·European Spine Journal : Official Publication of the European Spine Society, the European Spinal Deformity Society, and the European Section of the Cervical Spine Research Society·Vasiliki C PanagiotopoulouAlister J Hart
Jun 24, 2018·Biomedizinische Technik. Biomedical Engineering·Halim KovacıAyhan Çelik
Jun 14, 2021·Journal of the Mechanical Behavior of Biomedical Materials·Arnaud RibesseThomas Pardoen

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