Experimental Study of Failures of the Rigid Spinal Posterior Fixation System Under Compressive Load Conditions: A Cadaver Study.

Autor:	Kato T; Department of Social Innovation, Graduate School of Regional Innovation Studies, Mie University, Tsu, JPN., Inaba T; Department of Mechanical Engineering, Graduate School of Engineering, Mie University, Tsu, JPN., Baba S; Department of Mechanical Engineering, Graduate School of Engineering, Mie University, Tsu, JPN., Morimoto T; Department of Orthopaedic Surgery, Faculty of Medicine, Saga University, Saga, JPN., Mizuno T; Department of Orthopaedic Surgery, Seirei Hamamatsu General Hospital, Hamamatsu, JPN., Kasai Y; Department of Orthopaedics, Faculty of Medicine, Khon Kaen University, Khon Kaen, THA., Wisanuyotin T; Department of Orthopaedics, Faculty of Medicine, Khon Kaen University, Khon Kaen, THA., Sirichativapee W; Department of Orthopaedics, Faculty of Medicine, Khon Kaen University, Khon Kaen, THA., Kosuwon W; Department of Orthopaedics, Faculty of Medicine, Khon Kaen University, Khon Kaen, THA., Paholpak P; Department of Orthopaedics, Faculty of Medicine, Khon Kaen University, Khon Kaen, THA.
Jazyk:	angličtina
Zdroj:	Cureus [Cureus] 2024 Feb 10; Vol. 16 (2), pp. e53961. Date of Electronic Publication: 2024 Feb 10 (Print Publication: 2024).
DOI:	10.7759/cureus.53961
Abstrakt:	Background Many studies have been conducted on the biomechanics of the spine to elucidate the fixation properties of spinal fusion surgery and the causes of instrumentation failure. Among these studies, there are some studies on load sharing in the spine and measurement using strain gauges and pressure gauges, but there is a lack of research on axial compressive loads. Methods Axial compressive load tests were performed on human cadaveric injured lumbar vertebrae fixed with pedicle screws (PS). Both the strain generated in the PS rod and the intradiscal pressure were measured. Subsequently, the stress generated in the PS rod and the load sharing of the spine and instrumentation were calculated. Results Even when only compressive load is applied, bending stress of more than 10 times the compression stress was generated in the rod, and the stress tended to concentrate on one rod. Rod deformation becomes kyphotic, in contrast to the lordotic deformation behavior of the lumbar spine. The stress shielding rate was approximately 40%, less than half. Conclusions This study obtained basic data useful for constructing and verifying numerical simulations that are effective for predicting and elucidating the causes of dislodgement and failure of spinal implants. Competing Interests: The authors have declared that no competing interests exist. (Copyright © 2024, Kato et al.)
Databáze:	MEDLINE
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