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Acta Ortopédica Brasileira

versão impressa ISSN 1413-7852

Resumo

BARBOSA, Danillo; VILLAVERDE, Antonio Guillermo Jose Balbin; LOSCHIAVOARISAWA, Emilia Ângela  e  SOUZA, Renato Aparecido de. Laser therapy in bone repair in rats: analysis of bone optical density. Acta ortop. bras. [online]. 2014, vol.22, n.2, pp.71-74. ISSN 1413-7852.  https://doi.org/10.1590/1413-78522014220200438.

OBJECTIVE:

To investigate, by digital radiology, the bone regeneration process in rats submitted to femoral osteotomy and treated with low power laser therapy.

METHODS:

Forty-five Wistar rats were subjected to transverse osteotomy of the right femur and divided randomly into three experimental groups (n = 15): animals not treated with laser therapy G (C), animals that received laser therapy with λ: 660nm G (660nm) and animals that received laser therapy with λ: 830nm G (830nm). Animals were sacrificed after 7, 14 and 21 days. The bone calluses were evaluated by digital X-ray at 65 kVp, 7mA and 0.032 s exposures.

RESULTS:

The values obtained were submitted to variance analysis (ANOVA) followed by the Tukey-Kramer test. The significance level adopted was 5%. The groups G (C), G (660nm), and G (830nm) at the 7th day showed a significant bone development, with p <0.0116; the groups G (C), G (660nm), and G (830nm) at the 14th day showed values of p <0.0001; at the 21stday,a higher degree of bone repair were observed in group G (830nm), and G (660nm), with p <0.0169.

CONCLUSION:

Based on the radiographic findings, G (830nm) showed more complete bone regeneration, as shown in the gray shades of the images. Level of Evidence II, Individual Study With Experimental Design.

Palavras-chave : Fractures, bone; Osteotomy; Technology, radiologic; Fracture healing; Rats, wistar.

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