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injection under arthroscopy or ultrasound guiding. We designed a paired controlled study to investigate the advantages of using bone-tendon composite autograft to reconstruct chronic rotator cuff tear compared with primary repair and provide some evidence to use the bone-tendon composite autograft. Thirty-eight Sprague-Dawley rats were used. The native bone-tendon junctions of supraspinatus and Achilles tendon insertion from two rats were harvested for gross and histological observation. Another thirty-six rats had bilateral supraspina