Accessory navicular is associated with which complication?

Accessory navicular is associated with which complication?

• A. Flatfoot deformity
• B. Bunion formation
• C. Haglund deformity
• D. Metatarsus adductus

Answer: (A)

Accessory navicular is an extra piece of bone or cartilage near the navicular that often attaches to the posterior tibial tendon, which supports the medial arch. When this tendon is stressed or dysfunctional, its grip on the arch weakens, leading to collapse of the medial longitudinal arch and developing flatfoot (pes planus) with hindfoot valgus. That connection makes flatfoot deformity the most likely complication. Bunion formation, Haglund deformity, and metatarsus adductus involve different structures or mechanisms and are not primarily linked to the posterior tibial tendon–navicular relationship.

Accessory navicular is an extra piece of bone or cartilage near the navicular that often attaches to the posterior tibial tendon, which supports the medial arch. When this tendon is stressed or dysfunctional, its grip on the arch weakens, leading to collapse of the medial longitudinal arch and developing flatfoot (pes planus) with hindfoot valgus. That connection makes flatfoot deformity the most likely complication. Bunion formation, Haglund deformity, and metatarsus adductus involve different structures or mechanisms and are not primarily linked to the posterior tibial tendon–navicular relationship.