Effect of stress load on bone-tendon repair process after the arthroscopic treatment of bone rivets for acute rotator cuff injury in rabbits
JIANG Shengbo
DONG Yuefu
LIU Xudong
LIU Yan
Abstract：Objective To study the effect of stress stimulation in different intensity on bone-tendon repair process after acute rotator cuff injury in rabbits treated by bone rivets under arthroscopy. Methods According to whether performed postoperative function exercises, and the intensity of activity, 30 adult New Zealand white rabbits were randomly divided into 3 groups: high-intensity experimental group (range of motion of shoulder joint was -60° to 60° ), low-intensity experimental group (range of motion of shoulder joint was -15° to 15° ) and control group (free activity permitted). Models of rotator cuff injury in rabbits were established, and bone rivets were used to repair the injury under arthroscopy. Joint functional exercises were performed 1 week after the surgery, MRI examination of shoulder joint were undergone simultaneously. Animals were sacrificed at 2, 3, 4 week after the surgery by intravenous injection of air respectively, and the stiffness and ultimate tensile strength of specimens taken from supraspinatus tendon-bone interface were observed in each group. Results Gross observation showed no obvious differences among 3 groups. In low-intensity experimental group, MRI results showed homogeneous signals in muscle tendon, while no obvious high signal intensity in articular cavity; In high-intensity experimental group and control group, heterogeneous signals in muscle tendon and high signal intensity in articular cavity were found in MRI images. At 2, 3, and 4 week after the surgery, stiffness and maximum tensile strength in low-intensity group were significantly higher than those in control group and high-intensity group (P <0.05). Conclusion During the early repair process for acute rotator cuff injury treated by bone rivets under arthroscopy, low-intensity stimulation can improve biomechanical strength of bone-tendon interface, and therefore can get better effects compared with high-intensity stimulation.
Keywords：Rotator cuff injuryStressmechanicalArthroscopyRivetsExercise therapyBone-tendon repairRabbits
Publication Date：2013-01-01
Online Publishing Date：2025-08-15(First online date of this platform, not the publication date of the document)
Pages：6( 93-98 )