Three point bending test indicated that when the female rats were ovariectomized for three months , theproperties ofstructure mechanics and material mechanics changed obviously in model group rats′femur . Compared withthe sham operation group , bone quality decreased significantly . It is showed as bone brittleness increased , bonetoughness and the ability of anti impact decreased . Alendronate sodium and nylestriol can greatly improve thesemechanical properties of ovariectomy rats . The area of elastic...