K.I.
If the doctor has recommended it, I would do it.
In what position does he want the splint? Would a sling help?
Now, with that being said,I obliterated my left elbow almost 2 years ago and it still hurts SO bad...EVERY DAY! I wake up and am in pain and it takes a good 30 mins of easy bending to get it to loosen back up and stop with the shooting pain and move to the dull constant pain that I seem to have to live with....but I never had to wear a splint. I had a cast for 4 weeks and then just a sling and had it wrapped for another 4 weeks, for support.
It is great that he seems to have healed, kids are so resilent! I broke my elbow in Jan. and the part my forearm where the doctor had to break it to put me back together took until September to heal!
If you really can't get him to wear it, I would call the doctor and ask how important it is that he really wear it....b/c maybe just a sling would help?