Different Power Settings of LLLT on the Repair of the Calcaneal Tendon

Different Power Settings of LLLT on the Repair of the Calcaneal Tendon

Author Invaldi Neves, Marco Aurelio Autor UNIFESP Google Scholar
Pinfildi, Carlos Eduardo Autor UNIFESP Google Scholar
Wood, Viviane Timm Autor UNIFESP Google Scholar
Gobbato, Rafael Correa Autor UNIFESP Google Scholar
Silva, Fabio Mendes da Autor UNIFESP Google Scholar
Parizotto, Nivaldo Antonio Google Scholar
Hochman, Bernardo Autor UNIFESP Google Scholar
Ferreira, Lydia Masako Autor UNIFESP Google Scholar
Institution Universidade Federal de São Paulo (UNIFESP)
Universidade Federal de São Carlos (UFSCar)
Abstract Objective: the purpose of this study was to evaluate the effect of an 830-nm GaAlAs diode laser operating at output powers of 40, 60, 80, and 100mW and energy density of 30 J/cm(2) on the repair of partial calcaneal tendon ruptures in rats. Methods: A partial tendon rupture was induced in all animals, which were treated with laser irradiation for 5 consecutive days. Six days after injury, the injured tendons were removed and examined by polarized light microscopy. Collagen fiber organization was evaluated by birefringence measurements, and collagen content was determined by Picrosirius Red staining. Results: It was observed that the higher the output power (60-100mW) the greater the amount of type III collagen (p < 0.01). the amount of type I collagen was significantly greater (p = 0.05) in the 80mW group than in the control group (sham stimulation). A non-statistically significant improvement in the realignment of collagen fibers was observed in the irradiated groups. Conclusions: Low-level laser therapy resulted in significantly greater amounts of type III collagen (output powers of 60mW or more) and type I collagen (output power of 80 mW), however, no significant differences between groups were found in the realignment of collagen fibers.
Language English
Sponsor Division of Plastic Surgery of the UNIFESP
Date 2011-10-01
Published in Photomedicine and Laser Surgery. New Rochelle: Mary Ann Liebert Inc, v. 29, n. 10, p. 663-668, 2011.
ISSN 1549-5418 (Sherpa/Romeo, impact factor)
Publisher Mary Ann Liebert Inc
Extent 663-668
Origin http://dx.doi.org/10.1089/pho.2010.2919
Access rights Closed access
Type Article
Web of Science ID WOS:000295827500003
URI http://repositorio.unifesp.br/handle/11600/34122

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