Fig. 5
Graphs depicting the area ratio of elastic fibers to collagen in four regions of the ACL based on Fig. 4. The ratio for the AM bundle was highest in the upper regions, at 11.36 ± 0.90% (p < 0.05), and lowest in the lower region, at 4.87 ± 0.34% (p < 0.05), (A). Analysis of the regional composition of the PL bundle revealed that the dense area accounted for 10.33 ± 0.37% and the loose area accounted for 5.32 ± 0.78% (p < 0.05), (A). As demonstrated in Figure (B), the figures for each area were presented through the master chart. The boxplots display regional differences in the E/C ratio (elastic fiber/collagen fiber area ratio), with each box indicating median, 25th and 75th percentiles, and range values. Statistical significance (p < 0.05) is indicated by asterisks. E/C ratio, elastic fiber/collagen fiber area ratio; lAM, lower anteromedial bundle; lPL, lower posterolateral bundle; uAM, upper anteromedial bundle; uPL, upper posterolateral bundle.
