Nap Time Gone Wrong

So I put Cohen down for a nap, He has been in a big boy bed since Feb. and has been fine, sure he gets out of bed occassionally no big whoop, all and all he's taken to the change really well. Well....Again, I put him down for a nap, and I heard him messin around up there, then I heard a big thud....he started screaming...I ran upstairs and found him on the floor at the foot of the bed crying and holding his arm....there was a big mass above his elbow and his arm was completely limp, I called his pediatrician while my sister Dani held him , to find out what they wanted me to do, they said take him to the E.R. So we got in the car, drove to the hospital...got right in...they took an x-ray and it was definitely broken above the elbow, within the hour they were prepping him for surgery...he got 2 pins in his arm and we had to spend the night in the hospital. It was sad...but he was a champ....we watched Elmo and Disney movies all night. He had his splint on for 4 weeks....they didn't want to do the hard cast because he's so young and I guess can be kind of tramatic to get taken off....so we did our best with the splint...he kept trying to unwrap everything....so we resorted to wrapping it in packing tape. :).