I forget what this is but I saw a similar case on Dr Pol once, not a fan or supporter of his practices but none the less saw the case. He diagnosed it as a severe deficiency during development forget what it was. But theres a starting place for you. Another option send it to your local VMTH for...
Does it pit with pressure? Call a vet. You'd think a teacher would have sense to do so. You can give banamine a pain and ani inflammatory inj solution. Try exercise and cold hosing is he lame? Other issue is if its a market animal for consumption. Check withdrawal on meds.