Influence of Low Intensity Laser Therapy (AsGa)
on the Cicatrization Process of Mechanic Tendon Injury
in Wistar Rats¹

J. G. M. Lima^a, G. R. Oliveira Filho^c, M. T. B. R. M. Lima^{b, c}, A. S. Ferreira^c, and J. G. Silva^c

^a Laboratório de Saúde Ambiental, FTC. Salvador, BA. Brasil

^b Laboratório de Morfologia (LABMORF), Grupo de Pesquisa em Fisioterapia da UNISUAM, Rio de Janeiro, RJ. Brasil

^c Programa de Pós-graduação em Ciências da Reabilitação, UNISUAM, Rio de Janeiro, RJ. Brasil

e-mail: jglima.ssa@ftc.br

Received April 13, 2012; in final form, May 11, 2012; published online August 1, 2012

Abstract—The aim of this study was to compare the effect of the low level Laser therapy (AsGa) in the exper-
imental tendon injury. Low level Laser therapy has been used in several studies to observe the regenerative qual-
ity and tecidual cicatrization. Forty Wistar rats (male) were divided into 4 groups: control group (Cgroup);
injury group (L-group); treated group with Laser therapy 3 J/cm² (3J-group); and treated group with Laser ther-
apy 6 J/cm² (6J-group). Groups L, 3J, and 6J were submitted to a mechanic Achilles tendon injury with a
Kocher Forceps for 10 s. The animals were sacrificed after ten days of treatment. Histopathological evaluation
using hematoxylin-eosin and Picro–Sirius staining showed a decreased (p < 0.05) of collagen in L-group
(353.12 9.85 m²/field) compared to C-group (215.13 22.63 m²/field). Animals treated with Laser showed
a significant increase in collagen fibers despite the applied dosage (3J-group: 375.89 26.99 m²/field; 6J
group: 400.34 62.92 m²/field; p < 0.05). These data suggest that low-level Laser therapy was efficient for
the treatment of mechanics Achilles tendon injury in Wistar rats.

DOI: 10.1134/S1054660X12090083

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