I had a SLAP Lession repaired about 8 years ago. Basically, they made a small incision on the front and back of my shoulder, one for the scope and one for the instruments. Each incision was a cross hatch about 1/2 inch in diameter; now the scars are barely perceptable. To reattach the muscle, they used a biodegradable tack. The other method uses a screw, which necessitates a second operation for its removal.
It took me a month or two to gain full range of motion and several months to regain full strength. But it was much stronger than before the surgery. Depending on what muscle(s) you have done, I'm guessing your length of recovery/rehab will vary.
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