-Don't use a straight bar. This is forearm splints. Hairline fracture along the ulna.
-It will be worse (from my experience)
when doing heavy straight bar preacher curls.
-Now if it gets sooo bad, you won't be able to even use an EZ bar.
It's all about the supination of the forearm. the less supinated the less sheer pressure on the bone.
-Take calcium supplements. Use EZ bar and see if it helps. Best is to use dumbells either hammer curls or standard or reverse or zottman, makes no difference.
-I have got it so bad that at first i had to use a tri bar to do barbell hammer curls.
-Do pronated pullups, not supinated.
-The only barbell curls i do now are reverse EZ bar curls. Reverse grip takes away all the pain. It even seems to make the injury strengthen.