Osteoporosis is a disease of bone in which bone mineral density (BMD) is reduced and bone microarchitecture is disrupted. Osteoporotic bones are susceptible to fracture. It is defined according to the bone mineral density as measured by DEXA: a BMD of 2.5 standard deviations below the peak bone mass (20-year-old person standard) is indicative of osteoporosis. While treatment modalities are becoming available, prevention is still the most important way to reduce fracture. Due to its hormonal component, more women suffer from osteoporosis than men.