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Three-dimensional measurement of intervertebral kinematics in vitro using optical motion analysis

Holt, Catherine Avril ORCID:, Evans, Samuel Lewin ORCID:, Dillon, D. and Ahuja, Alka Surajprakash 2005. Three-dimensional measurement of intervertebral kinematics in vitro using optical motion analysis. Proceedings of the Institution of Mechanical Engineers, Part H: Journal of engineering in medicine 219 (6) , pp. 393-399. 10.1243/095441105X34374

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Measurement of the stiffness of spinal motion segments is widely used for evaluating the stability of spinal implant constructs. A three-dimensional motion analysis technique has been developed that allows accurate measurement of the relative movement of the vertebral bodies about a well-defined anatomical axis system. The position of marker clusters on each vertebra is tracked using digital infrared cameras (Qualisys AB, Gothenburg). Landmarks are identified using a marked pointer, and an anatomical coordinate system is defined for each vertebra. The transformation relating the upper and lower vertebrae is calculated, using the joint coordinate system approach of Grood and Suntay to find the rotations and translations in each anatomical plane. The stiffness of vertebrectomy constructs was investigated using a Synex vertebral body replacement and an anterior rod with one or two screws in each vertebral body, with or without damage to the posterior longitudinal ligament (PLL). A moment of 2 N m was applied about each anatomical axis, and the range of motion about each axis was calculated. The range of motion in flexion-extension and lateral bending was significantly greater with only one screw. When the PLL was cut, there was no significant increase in the range of motion.

Item Type: Article
Date Type: Publication
Status: Published
Schools: Centre for Advanced Manufacturing Systems At Cardiff (CAMSAC)
Uncontrolled Keywords: three-dimensional kinematics ; intervertebral kinematics ; spine ; spinal construct stiffness ; anterior and posterior spine instrumentation ; vertebrectomy
Publisher: Mechanical Engineering Publications
ISSN: 0954-4119
Last Modified: 02 May 2023 19:58

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