Journal
LASERS IN SURGERY AND MEDICINE
Volume 28, Issue 3, Pages 216-219Publisher
WILEY-LISS
DOI: 10.1002/lsm.1041
Keywords
peripheral nerve injury; compound muscle action potentials; low-power laser; spinal cord irradiation; rats
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Background and Objective: The purpose of the present study nas to examine the recovery of the crushed sciatic nerve of rats after low-power laser irradiation applied to the corresponding segments of the spinal cord. Study Design/Materials and Methods: After a crush injury to the sciatic nerve in rats, low-power laser irradiation was applied transcutaneously to corresponding segments of the spinal cord immediately after closing the wound by using 16 mW, 632 nm He-Ne laser. The laser treatment was repeated 30 minutes daily for 21 consecutive days. Results: The electrophysiologic activity of the injured nerves (compound muscle action potentials-CMAPs) was found to be approximately 90% of the normal precrush value and remained so for up to a long period of time. In the control nonirradiated group, electrophysiologic activity dropped to 20% of the normal precrush value at day 21 and showed the first signs of slow recovery 30 days after surgery. The two groups were found to be significantly different during follow-up period (P<0.001). Conclusion: This study suggests that law-power laser irradiation applied directly to the spinal cord can improve recovery of the corresponding insured peripheral nerve. <(c)> 2001 Wiley-Liss, Inc.
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