I have no patience for the drama this thread has seen but here is my professional opinion on the chameleon as a veterinarian.
I've looked at the pictures posted in this thread and the other. The casque is crooked, the mouth is slightly malaligned, and the right elbow looks abnormal in that it has a curved shape. All of these and especially the curved shape of the elbow are indicative of MBD, however it could be old and in the recovery stage. But in most cases bending indicates currently weakened bone and a pathological fracture. The single most common reason by nearly 100% in reptiles is metabolic bone disease (nutritional secondary hyperparathyroidism) with bending like that. If supplementation and UVB exposure is adequate then it could be healing but you don't know without doing diagnostic testing like X-rays to look at bone density or bloodwork to examine the calcium to phosphorus ratio.
I applaud you for taking him to the vet. Unfortunately many vets have very limited training or experience with reptiles, and even those that do see them still may not necessarily know what to look for in more subtle situations. I have met many vets in this category. It is not for lack of caring, simply lack of adequate experience with animals that differ so much from cats and dogs. Even though you rely on medical professionals to be experts it is not always so easy. The fact that the vet said it was "slightly fractured" is concerning. Either it is fractured or it is not. And if it is fractured at all then that is problematic and needs to be investigated. If it is fractured due to trauma then it needs to be splinted. But if not then it's because metabolic bone disease is present in which case no splint is used. Since no diagnostics were done then MBD cannot be ruled out. And there are physical findings enough to support the diagnosis. So it is faulty to simply say that it's not present if nothing was done to disprove the evidence that it is. Your chameleon has several areas with evidence of MBD unfortunately. Until diagnostics are done it is foolish to think otherwise and will delay treatment and allow the disease to progress.
Even if he doesn't have MBD the extra calcium is not harmful. Please treat him with additional calcium and use a fresh UVB bulb or natural sunlight regardless. It won't hurt, and it will probably help. Please see the resource on MBD for more information.