Comparison of the Effects of Electrical Field Stimulation and Low-Level Laser Therapy on Bone Loss in Spinal Cord-Injured Rats

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2010-10-01
Autores
Medalha, Carla Christina [UNIFESP]
Amorim, Beatriz Oliveira
Ferreira, Jessica Mayra
Oliveira, Poliani de
Rodrigues Pereira, Rosa Maria
Tim, Carla [UNIFESP]
Lirani-Galvão, Ana Paula Rebucci [UNIFESP]
Silva, Orivaldo Lopes da
Renno, Ana Claudia Muniz [UNIFESP]
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Objective: This study investigated the effects of low-level laser therapy (LLLT) and electrical stimulation (ES) on bone loss in spinal cord-injured rats. Materials and Methods: Thirty-seven male Wistar rats were divided into four groups: standard control group (CG); spinal cord-injured control (SC); spinal cord-injured treated with laser (SCL; GaAlAs, 830 nm, CW, 30mW/cm, 250 J/cm(2)); and spinal cord-injured treated with electrical field stimulation (SCE; 1.5 MHz, 1: 4 duty cycles, 30 mW, 20 min). Biomechanical, densitometric, and morphometric analyses were performed. Results: SC rats showed a significant decrease in bone mass, biomechanical properties, and morphometric parameters (versus CG). SCE rats showed significantly higher values of inner diameter and internal and external areas of tibia diaphyses; and the SCL group showed a trend toward the same result (versus SC). No increase was found in either mechanical or densitometric parameters. Conclusion: We conclude that the mentioned treatments were able to initiate a positive bone-tissue response, maybe through stimulation of osteoblasts, which was able to determine the observed morphometric modifications. However, the evoked tissue response could not determine either biomechanical or densitometric modifications.
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Photomedicine and Laser Surgery. New Rochelle: Mary Ann Liebert Inc, v. 28, n. 5, p. 669-674, 2010.
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