Im not so sure your cham has mbd.
those bumps dont signify a MBD diagnosis.
the limbs are straight, he isnt falling, he isnt grabbing his own limbs, i dont see any of the typical signs of MBD.
I think you just need a good supplement schedule, and good gutoading.
you need a calcium without d3 for every feeding, a calcium with d3 twice a month, and a multivitamin for twice a month.
or get repashy all in one calcium plus, and use that on every feeding.
the bumps are either his ribs, or subcutaneous parasites.. do the bumps ever change spots?
if not, just his ribs.