Accessory Navicular

Most common accessory bone of the foot
Medial plantar border of the navicular
Associated with Tibialis Posterior tendon

Symptoms

bursa, redness, irritation, local tenderness

Xray

Xray AP, Lat & 45 degree eversion oblique
Navicular is the last tarsal bone to ossify from multiple ossification centers
Females – 1-3.5 yr
Male – 3.0- 5.5 yr

There is no evidence that the longitudinal arch is any different, essentially an incidental finding

Classification

Ossicle in the tendon
Triangular bone joined by synchondrosis
Cornate navicular with bony fusion of the two parts

Treatment

Most patients assymptomatic or are successfully managed conservatively
Rarely simple surgical excision