Abstract
The medial collateral ligament (MCL) and anterior cruciate ligament (ACL) from New Zealand white rabbits ages 2, 12, and 36 mos were resected and utilized for analysis by light microscopy and electron microscopy, as well as for determinations of water content, collagen concentration, collagen crosslink (i.e., reducible, nonreducible) analysis, and collagen synthesis rates in vitro. Both modes of microscopy revealed substantial differences between the various age groups. Water content, as well as collagen concentration, decreased significantly from the 2-mo to the 12- or 36- mo groups. The concentration of the reducible crosslinks, associated with less mature tissue, was significantly greater in the younger tissues relative to the aged tissues. The nonreducible crosslink increased with maturation of the collagen in the 36-mo rabbits. Collagen synthesis rates fell from a highest value in the 2-mo group to the lowest in the 36-mo group.
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