EFFECT OF LOW INTENSITY PULSED ULTRASOUND ON REPAIR OF TENOTOMIZED ACHILLES TENDON OF RABBIT

Abstract

Tenotomized Achilles tendon Rabbits were used to investigate the effect of lowintensitypulsed ultrasound (LPUS) to accelerate the repair of injured tendon. Themedial Achilles tendons of 18 local breed male rabbits were transected of all animalswithout suture, and bandaging was performed to immobilization the injured limb.Nine animals were chosen randomly to receive low-intensity pulsed ultrasound, theother 9 animals served as control. pulsating ultrasound with intensities 500 mW/cm2and frequency 2.5 MHz were given over the healing tendons for 10 minute daily,using a gel as the coupling agent between the ultrasound probe and the skin. Thehealing tendons were evaluated clinically, macroscopically and microscopically forthree periods at 7, 14 and 21 days respectively after tenotomy, three rabbits for eachperiod. In the ultrasound-treated group at 14 and 21 days postoperatively, themacroscopic and histological studies demonstrated that the low-intensity pulsedultrasound enhanced the healing of tendomize Achilles tendon. The ultrasound treatedgroup showed more mature organization at all end points of injured tendons compared