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Illustration of a typical enthesis

The left panel is an artist's rendering of a sagital section through the area where the achilles tendon attaches to the calcaneus. The transition from tendon to enthesial fibrocartilage to calcified fibrocartilage and finally bone is indicated. Right panel: right ankle and foot.

TEN: Achilles tendon; CAL: calcaneus; EF: enthesial fibrocartilage; SF: sesamoid fibrocartilage; PF: periosteal fibrocartilage; RB: retrocalcaneal bursa; UF: uncalcified fibrocartilage; CF: calcified fibrocartilage; T: Tidemark.

Reproduced with permission from: Wagget, AD, Ralphs, JR, Kwan, AP, et al. Characterization of collagens and proteoglycans at the intersection of the human achilles tendon. Matrix Biol 1998; 16:457. Copyright © 1998 Elsevier Science.

Graphic 81198 Version 3.0