Talonavicular coalition - partial

Case contributed by Karine Morche
Diagnosis certain


16 years old female presenting left ankle swelling/pain after abnormal landing during basketball, with pinpoint lateral malleolus tenderness and possible navicular tenderness. Status post inversion at baseball practice.

Patient Data

Age: 16 years
Gender: Female

1. Partial talonavicular coalition is incidentally noted on the foot exam with osseous fusion of the talus and navicular laterally. Further evaluation with CT and or MRI of the left foot may be performed as clinically indicated.

2. No definite acute displaced fracture or dislocation in the ankle and foot.

3. The distal fibular and tibial growth plates have fused.

4. The ankle mortise is intact. The bone density is normal.

5.  Mild-to-moderate diffuse soft tissue swelling of the distal lower leg mainly laterally. 

Case Discussion

Talonavicular coalition is one of the less common types of tarsal coalitions. The other uncommon types are calcaneocuboid, and cubonavicular. The most common types of coalition are the calcaneonavicular (~45%) and the talocalcaneal (~45%). 

This case was submitted with supervision and input from:

Soni C. Chawla, M.D.
Associate Professor
Department of Radiological Sciences
David Geffen School of Medicine at UCLA
Olive View - UCLA Medical Center

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