A Special word about MBD
(Metabolic Bone Disease)

To prevent MBD you require:

  1. The correct reptile UVA/UVB light
  2. The right calcium supplement


MBD is the most commonly reported disease in juvenile chameleons, particularly Chamaeleo calyptratus, the veiled chameleon. The juvenile form of MBD is called rickets, a crippling disease brought on by nutritional imbalances that can be the result of deficiencies or excesses of several key nutritional elements including calcium, phosphorus, vitamin D3 and vitamin A.
Bones become thin and bend or break easily, generally visible as bowed front legs with rounded elbows, and a rubbery lower jawbone. Ribs may fracture easily and spines or tails may be kinked or deformed. The chameleon usually has difficulty navigating quickly, is shaky, unsteady or "clumsy".

Organs can also be damaged by this disease. In the latter stages of the disease the chameleon often cannot perch on a branch, is anorexic and cannot project it's tongue to eat or drink independently. The worst aspect of MBD is that it is a slow killer….chameleons crippled with this disease often linger…and suffer.

If you suspect your chameleon has signs of rickets or MBD, please have your vet perform an exam and diagnostic tests. An x-ray will determine the extent of bone loss. A blood test may provide valuable information on the extent of kidney damage and the blood levels of calcium and phosphorus.

Reference:
http://animalark.eapps.com/animal/CIN/ContentMgmt.nsf/Trouble/$first?OpenDocument