The effects of low intensity laser bone repair after complete spinal cord injury in rats

• Grant number: 13/06200-1
• Support Opportunities: Scholarships in Brazil - Scientific Initiation
• Start date: May 01, 2013
• End date: December 31, 2014
• Field of knowledge: Health Sciences - Physiotherapy and Occupational Therapy
• Principal Investigator: Carla Christina Medalha
• Grantee: Ana Lúcia Yaeko da Silva Santos
• Host Institution: Instituto de Saúde e Sociedade (ISS). Universidade Federal de São Paulo (UNIFESP). Campus Baixada Santista. Santos , SP, Brazil

Abstract

Spinal cord injury (SCI) is incapacitating, irreversible, and costly economic and social. One of the main consequences of the LME is the significant loss of Bone tissue within a few months to a year after trauma, leading to a decline in bone mineral density (BMD) and increased fracture risk. There are no literature standards for diagnosis, prevention, and treatment of fractures after SCI. Objective: To evaluate the effects of low-intensity laser therapy (LLLT; » = 830nm), fluency 120J/cm² consolidation of bone defects in tibias of rats with spinal cord injury. Methods: In this study, will be used two groups of animals being Experimental group 1 (n = 10) animals with spinal cord injury and fracture treated with LLLT, and Group 2 control (n = 10) animals with spinal cord injury with defect and without laser treatment. The Rats are anesthetized and after laminectomy at the spinal level will transaction T9- T10. After 2 weeks of spinal cord injury will be accomplished the bone defect. Treatment will be accomplished by means of a laser treatment apparatus Portable Laser Model DMC, 830nm output power of 30 mW power density of 50 W / cm ², diameter beam of 0.6 mm, the divergence of 1.5 °, the fluency of 120 J / cm ², and will begin 24 hours after surgery for bone defect and will be repeated every 48 hours for 3 weeks. After euthanasia, will be performed complete surgical resection of the tibia, and the right tibia for histological analysis and designated left tibia biomechanical analysis. The right tibia is prepared for making blades stained with HE, which will be evaluated by morphometric analysis and the analysis qualitative morphological.(AU)