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Proceedings Paper

Study of laser mediated cartilage reshaping
Author(s): Dimitar Dobrikov; Lachezar Avramov; Seryozha Valkanov
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Paper Abstract

Cartilage is a specialized tissue, which serves as a load-bearing structure. Its main components are: 70% water, 10-20% collagen fibers, 5-10% proteoglycans, 5%-chondrocytes. When bent, cartilage exhibits its property of shape memorization. Laser radiation may be used to change the shape of cartilage by heating of mechanically deformed specimen. The high water percentage in the cartilage, which determines its mechanical properties, raises the question of whether the medium in which the sample is placed influences the process of relaxation, connected with cartilage water losses. Using Nd:YAG laser (λ=1.32 μm), cartilage samples were irradiated. The stress relaxation time, the surface temperature during irradiation and the time dependence of the backscattered light intensity (which is indication for changes in the internal stress), were compared. The shape retention was measured by comparing the curvature before and after irradiation. Overbending of specimens was done in order to achieve the required angle. The obtained data could be used for development of clinical methods for correction or transplantation of injured human cartilage due to trauma or certain diseases.

Paper Details

Date Published: 22 April 2005
PDF: 5 pages
Proc. SPIE 5830, 13th International School on Quantum Electronics: Laser Physics and Applications, (22 April 2005); doi: 10.1117/12.618432
Show Author Affiliations
Dimitar Dobrikov, Institute of Electronics (Bulgaria)
Lachezar Avramov, Institute of Electronics (Bulgaria)
Seryozha Valkanov

Published in SPIE Proceedings Vol. 5830:
13th International School on Quantum Electronics: Laser Physics and Applications
Peter A. Atanasov; Sanka V. Gateva; Lachezar A. Avramov; Alexander A. Serafetinides, Editor(s)

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