Blood biochemistry test of vitamin D deficiency rickets in the extreme stage: the child's serum calcium is slightly reduced, blood phosphorus is significantly reduced, alkaline phosphatase is increased. x-ray examination of the epiphyseal epiphysis of the temporary calcified band disappeared, brush-like, cup-shaped changes, epiphyseal cartilage band is significantly wider, bone density is reduced, there may be a bending of the diaphysis or the green branch fracture.

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