Hey there! Overuse here too -- kickboxing and karate. Geez, now I know why they say martial arts are dangerous! Anyway, I'm 3 weeks postop and things are going well. Out of sling pretty much all the time now except when I go to kickboxing or karate (the chick in the sling doing kickboxing is now a source of amusement for everyone at the gym -- I should sell tickets). Start PT in about 3 more weeks but have been gently working ROM while I'm waiting. I will tell the PT that my arm may be injured but my feet still work just fine so don't hurt me!
Was the weakness you refer to before the surgery or are you talking about after? I had profound weakness on the injured side (which is what drove me to the OS in the first place) and I still haven't heard an explanation of why this particular injury caused such weakness. Hmmm... Anyway, not a lot worse now that I've had the surgery so I can only move forward from here!