Curved versus straight-cut hinges for open-door laminoplasty: A finite element and biomechanical study. (August 2020)

• Record Type: Journal Article
• Authors: Tejapongvorachai, Tawechai; Tanaviriyachai, Terdpong; Daniel Riew, K.; Limthongkul, Worawat; Tanavalee, Chotetawan; Keeratihattayakorn, Saran; Buttongkum, Danupong; Singhatanadgige, Weerasak
• Is Part Of: Journal of clinical neuroscience. Volume 78(2020)
• Page Start: 371
• Page End: 375
• Publication Date: 2020-08
• Subjects: Open-door laminoplasty -- Curved-cut technique -- Hinge site cutting technique -- Biomechanical study -- Straight-cut technique; Brain -- Surgery -- Periodicals; Neurosciences -- Periodicals; Nervous system -- Surgery -- Periodicals; Brain -- surgery -- Periodicals; Neurosurgical Procedures -- Periodicals; Neurosciences -- Periodicals; Electronic journals; 616.8
• DOI: 10.1016/j.jocn.2020.04.056
• Languages: English
• ISSNs: 0967-5868

Abstract

Highlights: Cervical vertebra laminoplasties with straight- and curved-cut hinges were compared. Modeling and experimental results indicate curved-cut hinges more failure resistant. New curved-cut technique potentially lowers risk of hinge fracture and displacement. Abstract: In this study, the stabilities of the hinge sides of plate-augmented open-door laminoplasties based on cutting in a curved or straight line were compared using a finite element (FE) model and an experimental assessment. Using FE models generated from CT scans of a human subject, straight and curved techniques for cutting the hinge side were evaluated. Compressive forces were applied to both simulated models, and the stress distributions on the respective hinge sites were evaluated by comparing the maximum von Mises stresses. Biomechanical testing procedures were then carried out on porcine cervical vertebrae, with straight- and curved-cut groups loaded to failure, and the corresponding reaction forces on the hinge sites were recorded using a loading cell. The FE analysis results revealed no significant differences between the straight- and curved-cut groups in terms of maximum stress forces on the superior, middle, or inferior portions of the hinge sites. In the experimental study, the curved-cut group withstood higher loads to failure at the hinge site than the straight-cut group. The ability of the curved-cut laminoplasty hinges to withstand higher compressive loading to failure than straight-cut hinges suggests the potential of the proposed technique to reduce the risk of hinge fracture and displacement.