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Depiction of the 3D structure of Achilles subtendons in whole tendon and cross-section. (A) Posterior and anterior views of the Achilles tendon show twisting subtendons. (B) Cross-sectional views at relative locations from the superior to inferior aspect of the free tendon, defined as the tendon distal to muscle and proximal to calcaneus. Calcaneal insertion is windowed in gray.
