Hyperphosphatemia can contribute to which bone-related condition?

• A. Renal osteodystrophy
• B. Secondary hyperparathyroidism
• C. Hyperkalemia
• D. Hyponatremia

Answer: (A)

Hyperphosphatemia in chronic kidney disease disrupts mineral balance, leading to low calcium, increased parathyroid hormone, and altered vitamin D activation. This sequence drives bone turnover abnormalities and resorption, producing renal osteodystrophy, the bone disorder associated with CKD–mineral and bone disorder. While secondary hyperparathyroidism is part of the mechanism, the resulting bone condition is specifically renal osteodystrophy. The other options are electrolyte problems rather than bone diseases.