Stieda process

Stieda process (not to be confused with a Pellegrini-Stieda lesion) refers to an elongated lateral tubercle of the posterior process of the talus 1,3. It is often considered an anatomical variant.

It forms from fusion of a secondary ossification center at the posterolateral aspect of the talus with rest of the talus (this typically occurs between 7-13 years) where the fused segment remains longer than usual 4.

It is best appreciated on a lateral ankle radiograph or sagittal CT/MRI views. 

It needs to be differentiated from an os trigonum (particularly if partially fused): which refers to a separate bony ossicle at the lateral tubercle of the talus.

It is named after L Stieda who is considered the first person to describe this in 1869 5.

Article information

rID: 19794
Synonyms or Alternate Spellings:
  • Stieda's process

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Cases and figures

  • Case 1
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  • Case 2
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  • Case 3: with posterior impingement syndrome
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  • Case 4
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  • Case 5
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