Not Medical Advice: While there is no exact figure listed, the amount of pressure it would take to break a bone depends on the bone structure and the direction of the force. Other factors include a person's age, how healthy he or she is, how strong a person's bones are, and how physically active he or she is.
To give you an idea, according to sources, a strong bone, such as femur, could take as much as 160 pounds of pressure to cause a fracture. For smaller bones, a pressure of 25 pounds may be enough to break them.
Sternum, commonly known as the brèastbone, is a long, narrow flat bone that serves as the keystone of the rib cage and stabilizes the thoracic skeleton. Several muscles that move the arms, head, and neck have their origins on the sternum. It also protects several vital organs of the chest, such as the heart, aorta, vena cava, and thymus gland that are located just deep to the sternum.
Check out 11 Tips to Improve Your Bone Health at Spine-Health.