I am the wife of a rugby player, so I have WAY too much experience with this type of thing. As long as nothing's broken, ice the swelling for 20 minutes on, 20 minutes off. Elevate his hand above heart level. Anti-inflammatories help. Yeah, it hurts like heck, but that's the price you pay when you play extreme sports. =) It's going to feel even worse tomorrow, I am sorry to report. My husband and his teammates all have a little "pharmacy" in their homes of various painkillers. I'm not sure a pediatrician would prescribe Darvocet or Vicodin, though. Give him whatever Advil or Motrin you have around the house, and keep giving it to him every couple of hours. I have seen my husband and other teammates given splints for their various dislocations, and in almost every case they took the splint off immediately, and none of them are maimed for life or anything.