Refractory rickets in the tropics.

Rickets is an important problem in children. The majority of rickets in children is due to deficiency of calcium, phosphorus or vitamin D. However, rickets may also be a feature of renal diseases, e.g. renal tubular acidosis, hypophosphatemic rickets or rickets associated with renal insufficiency. The treatment varies with etiology and hence complete workup is essential before initiating therapy.