Fig. 1
From: Effects of aging on the histology and biochemistry of rat tendon healing
The comparison of the gross appearance, hematoxylin and eosin (H&E) staining and histologic scores of the patellar tendon defects in young and aged rats. (A). The representative images of gross appearance of the patellar tendon at weeks 0, 2 and 4 postoperatively. (B). The representative images of patellar tendons of young and aged rats were observed by HE staining. The scale bar is 200 μm. (C). Histologic scores of young and aged rat patellar tendons. A: ECM organization of the whole tendon, B: proteoglycan content, C: cellularity/cell-matrix-ratio, D: cell distribution, E: cell nucleus morphology, F: organization of repair tissue of the tendon callus, G: transition from defect to normal tissue, H: configuration of callus, I: degenerative changes/tissue metaplasia, J: vascularization in the defect area and K: inflammation. *:p < 0.05, **:p < 0.01. n = 5