National Center for Injury Prevention and Control and National Osteoporosis Foundation developed the nice fracture triangles. Fall itself, force and direction of fall, and fragile bone that takes the impact, are three factors that play roles in resulting fall related fractures. If one of three factors can be changed, the chance of breaking bones are reduced. Age and estrogen deficiency during menopause, and various health and medical conditions, or environmental condition are all related to the fractures.