Fig. 2

Tendon marking and installation. A. The central point is defined as the right middle of the tendon and the clamp lines are defined as the location where the clamp applying on the tendon. We set the distance between the center point and the clamping line at both ends to be 3 cm to keep the distance between the clamp lines at both ends to be 6 cm. B. The porcine tendon in pocket group. The tendon was placed parallel to the direction of moving. The clamps are fixed in the position of clamp line. After the pocket was released, the surface of the clamps appeared hoarfrost quickly, which proves that the surface temperature of the clamps has dropped below 0 ℃, and the clamps and the tendon are frozen firmly