Talar beak sign (talus)

Dr Craig Hacking and A.Prof Frank Gaillard et al.

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. 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 capsule 1; 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

Terminology

The term bird's beak sign is used in a number of other contexts: see bird beak sign (disambiguation).

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Article information

rID: 10279
Section: Signs
Tag: refs, stub
Synonyms or Alternate Spellings:
  • Talar beak
  • Talar-beak sign

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Cases and figures

  • Case 1: with a talocalcaneal coalition
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  • Case 2: with a talocalcaneal coalition
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  • Case 3: with a calcaneonavicular coalition
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  • Case 4 : without talocalcaneal coalition
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  • Case 5: with talocalcaneal coalition
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