What causes osteomalacia in patients with type 2 renal tubular acidosis (RTA)?

Updated: Oct 10, 2018
  • Author: Christie P Thomas, MBBS, FRCP, FASN, FAHA; Chief Editor: Vecihi Batuman, MD, FASN  more...
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Answer

Some patients with type 2 RTA tend to have osteomalacia, a condition that can be observed in any chronic acidemic state, although it is more common in persons with type 2 RTA. The traditional explanation is that the proximal tubular conversion of 25(OH)-cholecalciferol to the active 1,25(OH)2-cholecalciferol is impaired. Patients with more generalized defects in proximal tubular function (as in Fanconi syndrome) may have phosphaturia and hypophosphatemia, which also predispose to osteomalacia.


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