I had Physical Therapy on my arms because my arms can pop out of socket or atleast roll in socket.. marines?

I'm thinking of joining the marines, but a friend of mine was turned down from the Air Force due to the fact that he had bad knees (had surgery on them, the Civilian doctor said he was able to join but the air force doctors said otherwise), my arms are very flexible.. i can roll them in socket and they can pop out easier than most peoples... i went through physical therapy for this for about 3-4 months and they cleared me ready to go, but i was wondering if this would hinder my chances of joining the marines... i still have occasional pains in it but it doesn't hinder my mobility or performance, please help