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Talar beak sign

The talar beak sign is seen in cases of tarsal coalition, and refers to a superior projection of the distal aspect of the talus. It is most frequently encountered in talocalcaneal coalition 1-2. It is thought to result from abnormal biomechanic stresses at the talonavicular joint. 

Differential diagnosis

It needs to be distinguished from :

  • an osteophyte due to degenerative change at the talonavicular joint
  • the talar ridge found more proximally at the site of insertion of the ankle capsule1. The normal talar ridge is several millimeters high and has a straight or slightly convex, graded slope proximally, and a straight, sharp margin distally 2

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