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Fig. 3 | Journal of Orthopaedic Surgery and Research

Fig. 3

From: Are there differences in arthroscopic and histological features between traumatic and degenerative rotator cuff tears in elderly patients? A prospective dual-center analysis

Fig. 3

a Type I: Fissuring of the collagenous fiber layer with no abnormal changes in the other three layers. The coracoacromial ligament attachment at the undersurface of the acromion was composed of four layers: collagenous fiber (C), fibrocartilage (FC), mineralized fibrocartilage (MF), and bone (B) (× 100). b Type II: Reactive changes such as enlargement of the fibrocartilage layer. Irregularity of the tidemark was observed (× 100). c Type III: Disappearance of the collagenous fiber layer and remaining hypertrophic changes in the fibrocartilage layer (× 100). d Type IV: Disappearance of the fibrocartilage layer, resulting in exposure of the osseous layer (× 100)

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