gap sign

Anatomy

Gastrocnemius tendon 10-25 cm long

- soleus 3-10 cm

- inserts superior calcaneal tuberosity

- fibres spiral 90°

- fibres that lie medially in proximal portion become posterior distally

- allows elastic recoil & energy storage

Plantaris present in 90% population

- medial to T Achilles

Poor blood supply midportion

- mesotenal vessels