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Relations between the Fatigue Life and Histology of Adult Human Cortical Bone
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From the Departments of Anatomy (Medical School) and Biomechanics (Highway Safety Research Institute) and the Center for Human Growth and Development, the University of Michigan, Ann Arbor
1970 by The Journal of Bone and Joint Surgery, Incorporated
J Bone Joint Surg Am, 1970 Dec 01;52(8):1579-1586
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1. Positive correlations at the 0.01 significance level occur between the fatigue life of bone and the percentage of osteons and of osteons plus fragments in the break area. Equally high negative correlations are found between the fatigue life of bone and the percentage of interstitial lamellae in the break area.

2. These correlations suggest that osteons tend to increase the fatigue life of bone and interstitial lamellae to decrease it. Osteons and interstitial lamellae have the opposite effect on the static tensile strength of bone.

3. Osteons are analogous to sticks, thus the more osteons in a given bone specimen the longer its fatigue life. Conversely, the more interstitial lamellae in a specimen, the fewer the number of osteons, and the shorter is the fatigue life.

4. Failure of a bone specimen under repeated flexure loading is comparable to breaking a stick by bending it back and forth. Thus, a bundle of sticks must be bent back and forth more times, that is, it has a longer fatigue life, than a single stick.

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    These activities have been planned and implemented in accordance with the Essential Areas and policies of the Accreditation Council for Continuing Medical Education (ACCME) through the joint sponsorship of the American Academy of Orthopaedic Surgeons and The Journal of Bone and Joint Surgery, Inc. The American Academy of Orthopaedic Surgeons is accredited by the ACCME to provide continuing medical education for physicians.
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