Lateral extra-articular hindfoot impingement with posterior tibial tendon split tear
Posterior tibial tendon dysfunction and lateral ankle pain in a patient with valgus deformity of the hindfoot.
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The valgus position of the calcaneus has led to combined talocalcaneal and subfibular lateral hindfoot impingement with oedema and cystic changes in the distal fibula and osteoarthritis as well as scar tissue formation between the lateral talus and calcaneus. There are also chronic degenenerative changes of the posterior tibial tendon involving a split tear (best seen on the coronal images) and chronic tenosynovitis with osteophytes along the retrotibial tendon groove. Effusion in the flexor hallucis longus sheath.