Ultrasonography: A) Injured tendon on 28 DPI: The diameter of the tendon is greatly increased; however, it is not uniform and shows amputated view. Its echogenicity is not detectable from the surrounding fascia. B) 84 DPI: Injured treated tendon of an 84 DPI rabbit. The diameter of the tendon is comparable to normal tendon. The tendon proper is detectable from its surrounding fascia. C) Normal contra-lateral tendon. The diameter of the tendon is lower than A and B. No amputated view is present and the echogenicity is smooth. D) The tendon diameter of injured tendon significantly reduced from day 21 to 84 post- injury.