Posterior Tibial Tendon Dysfunction

**Definition:** A condition characterized by a broad range of progressive disorders ranging from TENOSYNOVITIS to tendon rupture with or without hindfoot collapse to a fixed, rigid, FLATFOOT deformity. Pathologic changes can involve associated tendons, ligaments, joint structures of the ANKLE, hindfoot, and midfoot. Posterior tibial tendon dysfunction is the most common cause of acquired flatfoot deformity in adults.

**Tree numbers:** - C05.360.750

**Synonyms:** - Tibial Tendon Dysfunction, Posterior - Tibialis Posterior Dysfunction