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.
- acute fracture of the Stieda process
- it can be associated with posterior ankle impingement syndrome from impingement between the tibia and the calcaneus, especially in plantar flexion. In some symptomatic situations, it is resected 2
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.
History and etymology
It is named after L Stieda who is considered the first person to describe this in 1869 5.
- 1. Cerezal L, Abascal F, Canga A et-al. MR imaging of ankle impingement syndromes. AJR Am J Roentgenol. 2003;181 (2): 551-9. AJR Am J Roentgenol (citation) - Pubmed citation
- 2. Yilmaz C, Eskandari MM. Arthroscopic excision of the talar Stieda's process. Arthroscopy. 2006;22 (2): 225.e1-225.e3. doi:10.1016/j.arthro.2005.11.004 - Pubmed citation
- 3. Bureau NJ, Cardinal E, Hobden R et-al. Posterior ankle impingement syndrome: MR imaging findings in seven patients. Radiology. 2000;215 (2): 497-503. Radiology (citation) - Pubmed citation
- 4. Robinson P, White LM. Soft-tissue and osseous impingement syndromes of the ankle: role of imaging in diagnosis and management. Radiographics. 22 (6): 1457-69. Radiographics (citation) - Pubmed citation
- 5. Stieda L. Ueber secundäre fusswurzelknochen. Arch Physiol Wissensch Med 1869; 108-111.
- 6. DiGiovanni CW, Greisberg J. Foot and Ankle, Core Knowledge in Orthopaedics. Mosby Incorporated. (2007) ISBN:0323037356. Read it at Google Books - Find it at Amazon