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Operative methods: Schema of coronal sections. After rotator cuff repair, either PBS or BMP-7 was injected into the subacromial bursa in the PBS and BMP-7 groups, whereas a GHS impregnated with either PBS or BMP-7 was implanted on the repaired tendon attached to the tendon-to-bone insertion in the PBS+GHS and BMP-7+GHS groups. BMP-7, bone morphogenetic protein-7; GHS, gelatin hydrogel sheet; PBS, phosphate-buffered saline.
