Fig. 2From: The evaluation of degeneration of posterior cruciate ligament using CT Hounsfield unit in knee osteoarthritisCollagen fibers in PCL stained with Safranin-O fast-green. The grade of collagen fiber impairment was classified as follows: mild, impairment of less than 20% of the collagen fibers; moderate, impairment of at least 20% and less than 50% of the collagen fibers; and severe impairment of more than 50% of the collagen fibers. The scale bar indicates 100 μmBack to article page