The Journal of Bone and Joint Surgery, Vol 57, Issue 7 956-961, Copyright © 1975 by Journal of Bone and Joint Surgery, Inc
Contribution of collagen and mineral to the elastic-plastic properties of bone
AH Burstein, JM Zika, KG Heiple and L Klein
Tension testing of wet bovine haversian cortical bone demonstrated marked
plastic behavior. Progressive surface decalcification of this bone with
dilute hydrochloric acid resulted in progressive decreases in the tension
yield point and the ultimate stress with no change in the yield strain or
ultimate strain unless decalcification was complete. The slope of the
plastic region remained identical throughout decalcification. These
findings are consistent with an elastic-perfectly plastic model for the
mineral phase of bone tissue in which the mineral contributes the major
portion of the tension yield strength. The slope or stiffness of the
plastic region of the stress-strain curve is a function only of the
properties of collagen, which itself plays a minor role in the tension
yield strength of bone.