维生素D_3缺乏和钙质摄入不足可使老年人甲状旁腺功能增强。钙与维生素D的补充可减轻这种继发的甲状旁腺机能亢进,但这种补给是否会降低老年人髋部骨折的发病率目前还不清楚。研究者对髋部经常骨折和另一些非脊椎骨折的病人补充维生素D_3(胆骨化醇)及钙, Lack of vitamin D_3 and insufficient calcium intake can enhance the parathyroid function in the elderly. Supplementation with calcium and vitamin D can reduce this secondary hyperparathyroidism, but whether this supply will reduce the incidence of hip fracture in the elderly is unclear. Researchers in patients with frequent fractures of the hip and other non-vertebral fractures were supplemented with vitamin D_3 (cholecalciferol) and calcium,