Abstract
Diabetes mellitus (DM) is associated with musculoskeletal damage. Investigations have indicated that healing of the surgically tenotomized Achilles tendon was considerably augmented following low-level laser therapy (LLLT) in non-diabetic, healthy animals. The aim of the present study was to evaluate the effect of LLLT on the Achilles tendon healing in streptozotocin-induced diabetic (STZ-D) rats via a biomechanical evaluating method. Thirty-three rats were divided into non-diabetic (n = 18) and diabetic (n = 15) groups. DM was induced in the rats by injections of STZ. The right Achilles tendons of all rats were tenotomized 1 month after STZ injections. The two experimental groups (n = 6 for each group) of non-diabetic rats were irradiated with a helium–neon (He–Ne) laser at 2.9 and 11.5 J/cm2 for ten consecutive days. The two experimental groups of diabetic rats (n = 5 for each group) were irradiated with a He–Ne laser at 2.9 and 4.3 J/cm2 for ten consecutive days. The tendons were submitted to a tensiometric test. Significant improvements in the maximum stress (MS) values (Newton per square millimeter) were found following LLLT at 2.9 J/cm2 in both the non-diabetic (p = 0.031) and diabetic (p = 0.019) experimental groups when compared with their control groups. LLLT at 2.9 J/cm2 to the tenotomized Achilles tendons in the non-diabetic and diabetic rats significantly increased the strength and MS of repairing Achilles tendons in our study.
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Acknowledgments
We wish to extend our sincere thanks to the late Mrs. Jamileh Rezaei and the Vice-Chancellor of Research at the Medical Faculty of Shaheed Beheshti University MC, Tehran, Iran for financial support (grant no. 13.15183).
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The authors declare that they have no conflict of interest.
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Nouruzian, M., Alidoust, M., Bayat, M. et al. Effect of low-level laser therapy on healing of tenotomized Achilles tendon in streptozotocin-induced diabetic rats. Lasers Med Sci 28, 399–405 (2013). https://doi.org/10.1007/s10103-012-1074-7
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DOI: https://doi.org/10.1007/s10103-012-1074-7