actually, recently i just got an avulsion, which is when you pull a muscle and it pulls out a piece of the bone, too. >> no stranger to pain, rj had to sit out earlier in his seventh grade season because of a broken arm. >> i went up to get a rebound, and i fell -- someone pushed me from behind. i fell. i went to catch myself, stuck my arm out, and i just felt, like this jolt of pain go up through my arm. >> and rj is not alone. between 2005 and 2011, experts found that 1.5 million high-school basketball players were treated in emergency departments. that's certainly a lot. in an attempt to keep sports safer, many schools are hiring people called athletic trainers. >> we're there to prevent injuries and evaluate them quickly, treat them immediately, and try our best to make sure that, as we return them to play, we do it in the most safe and efficient way possible. >> unfortunately, not a lot of schools have athletic trainers for their sports teams. >> in the high-school setting, about 42% of u.s. high schools have athletic trainers. in the middle-school setting, i think it's even less.