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Comparative study of laser and LED systems of low intensity applied to tendon healing

  • Laser Methods in Chemistry, Biology, and Medicine
  • Published:
Laser Physics

Abstract

The aim of this study was to compare the effects of Low-intensity Laser Therapy (LILT) and Light Emitting Diode Therapy (LEDT) of low intensity on the treatment of lesioned Achilles tendon of rats. The experimental model consisted of a partial mechanical lesion on the right Achilles tendon deep portion of 90 rats. One hour after the lesion, the injured animals received applications of laser/LED (685, 830/630, 880 nm), and the same procedure was repeated at 24-h intervals, for 10 days. The healing process and deposition of collagen were evaluated based on a polarization microscopy analysis of the alignment and organization of collagen bundles, through the birefringence (optical retardation-OR). The results showed a real efficiency of treatments based on LEDT and confirmed that LILT seems to be effective on healing process. Although absence of coherence of LED light, tendon healing treatment with this feature was satisfactory and can certainly replace treatments based on laser light applications. Applications of infrared laser at 830 nm and LED 880 nm were more efficient when the aim is a good organization, aggregation, and alignment of the collagen bundles on tendon healing. However, more research is needed for a safety and more efficient determination of a protocol with LED.

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Authors and Affiliations

  1. Programa de Pós-Graduação Interunidades Bioengenharia EESC/IQSC/FMRP-USP, São Carlos, SP, Brazil

    J. L. N. Bastos

  2. Physics Institute of São Carlos, University of São Paulo, São Carlos, SP, Brazil

    R. F. Z. Lizarelli

  3. Department of Physiotherapy, Federal University of São Carlos, São Carlos, SP, Brazil

    N. A. Parizotto

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  1. J. L. N. Bastos
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  2. R. F. Z. Lizarelli
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  3. N. A. Parizotto
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Correspondence to J. L. N. Bastos.

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Original Russian Text © Astro, Ltd., 2009.

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Bastos, J.L.N., Lizarelli, R.F.Z. & Parizotto, N.A. Comparative study of laser and LED systems of low intensity applied to tendon healing. Laser Phys. 19, 1925–1931 (2009). https://doi.org/10.1134/S1054660X09170022

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  • DOI: https://doi.org/10.1134/S1054660X09170022

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