i agree with ramy as it was the first thing i thought of. doesn't mean it is the correct answer. but then i heard something on sports center this afternoon about albert giving a team mate a hearty handshake a few days after the incident. i believe they said it was the wrist that was injured. it seems it might open a big can of worms.
but it was his non throwing/left wrist. Who the heck shakes with their left hand? (unless the right hand is broken or you dont have one)