The result of blood calcium and phosphate levels being too low for normal deposition is a softness of the bones called in children and in adults.

The answer to the first part is called osteomalacia and the second is called rickets.
Hope this helps.

1st. osteomalacia
2nd. rickets

I hope this helps and have a wonderful day!!

In this case, considering the spinal cord is completely disrupted, the organization of the white and gray matter would be a mess the central gray matter proportion would have leaks of CSF which contains nutrition and other function for neurons making the surrounding bone area prone degradation so it is likely that any function linked to the fibers below T12 are absent other than that severed white fiber would be all over the place