Renal Osteodystrophy in Chronic Renal Failure

Bone disease develops relatively early in the development of chronic renal failure. Much of what is known about the evaluation and management of renal osteodystrophy in chronic renal failure is based on knowledge obtained in the dialysis population. The classic bone lesion found in the dialysis population is osteitis fibrosa, the high turnover lesion of secondary hyperparathyroidism. Clearly, hypocalcemia, hyperphosphatemia, and calcitriol deficiency play major roles in the development and maintenance of the high turnover disease. Interestingly, in both the dialysis and nondialysis patients, the incidence of adynamic bone disease, a low turnover lesion, is increasing. It is postulated that the aggressive use of calcium-containing phosphate binders and the use of calcitriol and other vitamin D analogs to treat secondary hyperparathyroidism may contribute to this shift in bone lesions. Treatment in the nondialysis kidney disease patient remains aggressive correction of hypocalcemia and hyperphosphatemia. The use of calcitriol and other agents to maintain serum calcium and to suppress elevated parathyroid hormone remains well supported. However, the increase in extraskeletal calcifications and incidence of adynamic bone disease in these patients raises concern about current management techniques.