C sign - talocalcaneal coalition
Last revised by Evangeline Collins on 5 Aug 2024
Citation, DOI, disclosures and article data
Citation:
Venkatesh M, Collins E, Bell D, et al. C sign - talocalcaneal coalition. Reference article, Radiopaedia.org (Accessed on 08 Oct 2024) https://doi.org/10.53347/rID-25694
Permalink:
rID:
25694
Article created:
3 Nov 2013,
Manchikanti Venkatesh
Disclosures:
At the time the article was created Manchikanti Venkatesh had no recorded disclosures.
View Manchikanti Venkatesh's current disclosures
Last revised:
5 Aug 2024,
Evangeline Collins
Disclosures:
At the time the article was last revised Evangeline Collins had no financial relationships to ineligible companies to disclose.
View Evangeline Collins's current disclosures
Revisions:
18 times, by
14 contributors -
see full revision history and disclosures
Systems:
Sections:
Synonyms:
- C sign of tarsal coalition
- C sign of talocalcaneal coalition
- Calcaneal C sign
The C sign is an important radiological sign which may be seen on a lateral radiograph of the ankle in those with the talocalcaneal subtype of tarsal coalition. It can be seen in both osseous and non-osseous coalition.
Radiographic appearance
A continuous C-shaped arc on a lateral ankle radiograph is formed by the medial outline of the talar dome and posteroinferior aspect of the sustentaculum tali due to their bridging.
Differential diagnosis
Considerations include:
- subtalar syndesmosis or synchondrosis: CT is helpful in differentiating
- positional artifact
References
- 1. Kim SH. The C sign. Radiology. 2002;223 (3): 756-7. Radiology (full text) - doi:10.1148/radiol.2233991817 - Pubmed citation
- 2. Crim JR, Kjeldsberg KM. Radiographic diagnosis of tarsal coalition. AJR Am J Roentgenol. 2004;182 (2): 323-8. doi:10.2214/ajr.182.2.1820323 - Pubmed citation
- 3. Newman JS, Newberg AH. Congenital tarsal coalition: multimodality evaluation with emphasis on CT and MR imaging. Radiographics. 20 (2): 321-32. Radiographics (full text) - Pubmed citation
- 4. A. Sakellariou. Talocalcaneal coalition. J Bone Joint Surg Br. 2000;82-B (4): 574-578. J Bone Joint Surg Br (abstract)
- 5. Bohne WH. Tarsal coalition. Curr. Opin. Pediatr. 2001;13 (1): 29-35. Pubmed citation
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