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. Author manuscript; available in PMC: 2012 Oct 13.

Published in final edited form as: J Biomech. 2011 Aug 31;44(15):2659–2666. doi: 10.1016/j.jbiomech.2011.08.006

8a. Examples of the two types of propagated severe damage, contained and extended, are shown under filters for each fluorescent stain as well as the composite image (alizarin=red, calcein=green). 8b. In the older age group, propagated severe damage was more likely to be extended than contained. 8c. Damage areas in the initial extended group after static loading and final extended group after cyclic loading were greater in younger compared to older groups. In the younger group, the final extended damage area was significantly greater than the contained damage area. Bars represent significant differences.

8a. Examples of the two types of propagated severe damage, contained and extended, are shown under filters for each fluorescent stain as well as the composite image (alizarin=red, calcein=green). 8b. In the older age group, propagated severe damage was more likely to be extended than contained. 8c. Damage areas in the initial extended group after static loading and final extended group after cyclic loading were greater in younger compared to older groups. In the younger group, the final extended damage area was significantly greater than the contained damage area. Bars represent significant differences.