Illustration of the evolution of osetoporosis shown in the outline of a woman. On the left, a young woman with an upright posture. In the middle, a 60-year old woman suffering from medium osteoporosis. She has lost several centimeters in height and is becoming stooped. On the right, a 70-year old woman with severe osteoporosis. She has pronounced compression of the vertebra and her pelvis is tilting forwards.