A Rare Case of Adult Acquired Flatfoot Deformity (AAFD) With Chronic Atraumatic Subtalar Dislocation: Successful Reduction and Fusion of the Talonavicular and Talocalcaneal Joints
Year: 2025
Type: article
Study design: Case Report
Abstract: Chronic atraumatic subtalar dislocation is an exceptionally rare and severe manifestation of adult acquired flatfoot deformity (AAFD) secondary to posterior tibial tendon insufficiency (PTTI). Early recognition is critical, as progressive deformity leads to rigid valgus malalignment and functional decline. A 65-year-old male presented with a seven-year history of worsening left foot pain and deformity. Examination showed rigid hindfoot valgus, midfoot collapse, forefoot abduction, and taut skin over the medial talar head. Radiographs revealed chronic lateral subtalar dislocation with talonavicular and talocalcaneal involvement. Surgical reduction and fusion were performed, utilizing three cannulated cancellous screws for the talocalcaneal joint and two bone staples for the talonavicular joint, followed by structured rehabilitation. At six months, the patient demonstrated substantial improvement in pain, function, and radiographic alignment, with stable fusion. This case highlights the importance of recognizing severe AAFD with subtalar dislocation and demonstrates that joint reduction with selective fusion can yield significant functional improvement.
Source: Cureus
DOI: 10.7759/cureus.97680
Authors: Ilias Fanourgiakis, Emmanouil Zervos, Anastasios Mourikis, Alkiviadis Vossos
Institutions: KAT General Hospital of Attica, Athens Medical Center
Language: English
Topic: Foot and Ankle Surgery
Subfield: Orthopedics and Sports Medicine
Field: Medicine
Domain: Health Sciences
Open Access status: diamond
OpenAlex ID: W4416590095