Calcaneonavicular coalition
Citation, DOI, disclosures and article data
At the time the article was created Alexandra Stanislavsky had no recorded disclosures.
View Alexandra Stanislavsky's current disclosuresAt the time the article was last revised Joachim Feger had no financial relationships to ineligible companies to disclose.
View Joachim Feger's current disclosures- Calcaneo-navicular coalition
Calcaneonavicular coalition is one of the two most common subtypes of the tarsal coalition, the other being talocalcaneal coalition. As with any coalition, it may be osseous (synostosis), cartilaginous (synchondrosis) or fibrous (syndesmosis).
Radiographic features
This type of coalition is more easily diagnosed on plain film than talocalcaneal coalition.
Plain radiograph
Oblique view
best at depicting calcaneonavicular coalition directly as a calcaneonavicular bar
AP view
may also directly show the coalition
-
indirect signs include
the broad proximal surface of the navicular bone: broader than the articulating talar head
lateral tapering of navicular
Lateral view
Indirect signs include:
anteater sign: an elongated anterior process of the calcaneus
reverse anteater sign: elongated lateral navicular
short talar neck
CT
CT can be used to confirm the diagnosis where this was equivocal or not seen on plain films. It may also be used for surgical planning.
MRI
MRI is probably more helpful in assessing and characterizing cartilaginous and fibrous coalition and allows assessment of associated bone and soft tissue edema.
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Treatment and prognosis
As with any tarsal coalition, non-operative management may allow some improvement in symptoms initially, but they usually return. Usually, surgical treatment with excision of the coalition is required.
References
- 1. Newman J & Newberg A. Congenital Tarsal Coalition: Multimodality Evaluation with Emphasis on CT and MR Imaging. Radiographics. 2000;20(2):321-32; quiz 526. doi:10.1148/radiographics.20.2.g00mc03321 - Pubmed
- 2. Crim J & Kjeldsberg K. Radiographic Diagnosis of Tarsal Coalition. AJR Am J Roentgenol. 2004;182(2):323-8. doi:10.2214/ajr.182.2.1820323 - Pubmed
- 3. Nalaboff K & Schweitzer M. MRI of Tarsal Coalition: Frequency, Distribution, and Innovative Signs. Bull NYU Hosp Jt Dis. 2008;66(1):14-21. - Pubmed
Incoming Links
- Calcaneonavicular coalition (bone scan)
- Talocalcaneal coalition
- Calcaneonavicular coalition
- Anteater nose
- Calcaneonavicular coalition
- Cuboid-navicular coalition
- Calcaneonavicular cartilage coalition
- Osteomyelitis and calcaneonavicular coalition
- Calcaneonavicular coalition
- Calcaneonavicular coalition - osseous
- Calcaneonavicular coalition
- Calcaneonavicular coalition
- Calcaneo-navicular coalition
- Calcaneonavicular coalition - anteater nose sign
- Calcaneonavicular coalition - cartilaginous
- Tarsal coalition
- Calcaneonavicular coalition - bilateral osseous
- Calcaneonavicular coalition
- Calcaneonavicular coalition
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