Low bone mineral density (BMD) and low bone mineral content (BMC) are two of the most important measurable risk factors to the osteoporotic fracture (OF).

• 低骨密度(Bone mineral density；BMD)与低骨矿含量(Bone mineral content；BMC)是骨质疏松性骨折(Osteoporotic fracture.；OF)两种主要的可测风险因子。