The flexible flatfoot in the adult.

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Abstract

[Indexed for MEDLINE] 3. Posterior Tibial Tendon Dysfunction(Archived). Knapp PW(1), Constant D(2). In: StatPearls [Internet]. Treasure Island (FL): StatPearls Publishing; 2026 Jan–. 2024 May 21. Author information: (1)Ascension Providence Health System (2)Coordinated Health Posterior tibial tendon dysfunction (PTTD), now renamed progressive collapsing foot deformity (PCFD), is the most common cause of adult-acquired flatfoot deformity. Failure of the posterior tibial tendon (PTT) affects surrounding ligamentous structures and eventually leads to bony involvement and deformity. PTTD is a progressive and debilitating disorder that can be detrimental to patients due to resulting limitations in mobility, significant pain, and weakness. Risk factors for the disease have been studied and may include hypertension, obesity, diabetes, previous trauma, or steroid exposure. This activity will explain the extent of the disease and its progression. Copyright © 2026, StatPearls Publishing LLC.