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Paper Information

Journal:   IRANIAN JOURNAL OF MEDICAL PHYSICS   WINTER 2006 , Volume 2 , Number 9; Page(s) 81 To 88.
 
Paper: 

THE EFFECT OF LOW LEVEL LASER THERAPY ON THE REPAIR OF OSTEOCHONDRAL DEFECTS IN RABBIT KNEE

 
 
Author(s):  KAMALI FAHIMEH*, EBRAHIMI ESMAEIL, BAYAT MOHAMMAD, TORKAMAAN G., SALAVATI M.
 
* TEHRAN UNIVERSITY OF MEDICAL SCIENCES, TEHRAN, IRAN
 
Abstract: 

Introduction: Although low energy laser therapy has been shown to enhance collagen production and wound healing but its effect on cartilage stiffness has not been reported. The aim of this study was to evaluate the biomechanical behaviour of the repaired surfaces of defective articular cartilage in the patellar groove of rabbit femur after a pulsed low level Gallium-Arsenide (GA-AS) laser irradiation.
Materials and Methods: osteochondral defects of 5 mm in diameter and 4 mm deep were drilled in the femoral patellar groups of forty-one adolescent male rabbits and were examined at 4, 8 and 16 weeks. They were divided into six groups (3 experimental and 3 control groups). The experimental groups received pulsed GA-AS laser irradiation (890 nm) having energy density of 4.8 j/cm2. For the control groups, the surgical procedure was the same as the experimental ones, but only placebo laser treatment was applied. The untreated defects were allowed to heal spontaneously. The knee joint were removed, and the defects were examined bio-mechanically by in situ indentation method at three time intervals (4, 8 and 16 weeks post treatment). The thickness, instantaneous and equilibrium indentation stiffuess were measured during the test.
Result: Although no difference was observed in cartilage the mechanical properties after 4, 8 and 16 weeks period in the two groups (laser and control), differences between the laser and the control group were found at the 8thweek period in the equilibrium elastic modulus which was significantly higher in the laser group than the control one. The average thickness of normal patellar groove cartilage in the normal limb of both groups was detected (0.4
±03).
Discussion and Conclusion: GA-AS laser irradiation improves the stiffness of repairing cartilage at 8 week after injury.

 
Keyword(s): LOW LEVEL LASER, ARTICULAR CARTILAGE, INDENTATION
 
References: 
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