It is very POSSIBLE he has MBD based on the look of his legs in the pics. His legs are not straight and the joints look bowed. However, without a good herp vet exam, xrays, and blood work to check for calcium/phosphorus balance we can't be sure if it is a relict from past poor care (we don't know how long you've had him or where you got him), ongoing disease, or hereditary problems (there are a lot of sick little veileds out there). Regardless, your cham needs a vet exam and tests to determine his body calcium level. Its not as simple as giving a bunch of calcium over the counter. He will need careful correct lighting, basking outdoors regularly, correctly gutloaded feeders, and he may do just fine. Please read the good nutritional info on www.herpnutrition.com before dosing him with anything. Also, the other sites I listed earlier should give you info on the type of lighting etc. he'll need regardless. Go to www.herpnutrition.com. Don't panic, this is treatable and he may not get any worse if you deal with it now.