Just my 2 cents about movement after surgery (and I have NOT had TOS surgery.....yet). I had left shoulder surgery ~11 mo ago to repair a SLAP lesion (torn labrum) I was in a sling for 6wks. The first 2wks i could only take the sling off to shower. I still managed to grab for things, slip and fall- catching myself with my left arm, of course. I was amazed at how quickly those muscles wasted away. When I started PT, I could only lift my extended arm to about 1/2 way between shoulder and waist height. It took 2-3 wks of PT and alot of pain and streches to get it close to shoulder height.