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Proceedings Paper

Optical-mechanical measurements of biomechanical characteristics of lumbar spines after application of various surgical fixation methods
Author(s): Jiri Keprt; Ludek Bartonek; Jiri Charamza; Lumir Hrabalek
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Paper Abstract

Special equipment was realized for measurement of biomechanical characteristics of samples of lower part of the spine that means the lumbar part L1-L5. The measuring was carried out on 3 spinal samples. At first on an intact spinal sample, on a destabilized spinal sample and on a stabilized spinal sample. The stabilization was carry out by cylindrical cages and fixation screws. Using force-meters each specimen was tested sequentially nondestructively in axial torsion, compression, flexion and extension and lateral bending. Stiffness of destabilized and stabilized samples were computed to that of intact spine. During straining and measurement of ht rigidity of the sample as a whole it is also necessary to observe the movement of individual parts of the sample. This movement is followed with the help of round targets connected to the appropriate vertebra to be observed. The detectional targets are lit with a lamp, in some cases with a laser, and are watched by two CCD cameras. An optical signal is brought into a computer and evaluated by the fast Fourier transformation method. The period and direction of interference fringes determine the size and the direction of the shift.

Paper Details

Date Published: 7 March 2001
PDF: 7 pages
Proc. SPIE 4356, 12th Czech-Slovak-Polish Optical Conference on Wave and Quantum Aspects of Contemporary Optics, (7 March 2001); doi: 10.1117/12.417861
Show Author Affiliations
Jiri Keprt, Palacky Univ. and Institute of Physics (Czech Republic)
Ludek Bartonek, Palacky Univ. (Czech Republic)
Jiri Charamza, Palacky Univ. (Czech Republic)
Lumir Hrabalek, Univ. Hospital (Czech Republic)

Published in SPIE Proceedings Vol. 4356:
12th Czech-Slovak-Polish Optical Conference on Wave and Quantum Aspects of Contemporary Optics
Jan Perina; Miroslav Hrabovsky; Jaromir Krepelka, Editor(s)

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