Calcaneonavicular coalition
Updates to Article Attributes
Calcaneonavicular coalition is one the two most common subtypes of tarsal coalition, the other being a talocalcaneal coalition.
As with any coalition may be osseous (synostosis), cartilaginous (synchondrosis) or fibrous (syndesmmosis(syndesmosis).
Radiographic features
This type of coalition is more easily diagnosed on plain film than a talocalcaneal coalition.
Plain film
Oblique view
- best at depicting calcaneonavicular coalition directly as a calcaneonavicular bar
AP view
- may also directly show coalition
- indirect signs include
- broad proximal surface of navicular - broader than the articulating talar head
- lateral tapering of navicular
Lateral view
Indirect signs include:
- anteater sign: elongated anterior process of calcaneus
- reverse anteater sign: elongated lateral navicular
- talar beak
- short talar neck
CT
CT can be used to confirm the diagnosis where this was equivocal or not seen on plain films. It may allow be used for surgical planning
MRI
MRI is probably more helpful in assessing and characterising cartilaginous and fibrous coalition and allows assessment of associated bone and soft tissue oedema.
Treatment and prognosis
As with any tarsal coalition, non-operative management may allow some improvement in symptoms initially, but they usually return. SurgicalSurgical treatment with excision of the coalition is usually required.
-<p><strong>Calcaneonavicular coalition</strong> is one the two most common subtypes of <a href="/articles/tarsal_coalition">tarsal coalition</a>, the other being a <a href="/articles/talocalcaneal_coalition">talocalcaneal coalition</a>.</p><p>As with any coalition may be osseous (synostosis), cartilaginous (synchondrosis) or fibrous (syndesmmosis).</p><h4>Radiographic features</h4><p>This type of coalition is more easily diagnosed on plain film than a talocalcaneal coalition.</p><h5>Plain film</h5><h6><strong>Oblique view</strong></h6><ul><li>best at depicting calcaneonavicular coalition directly as a calcaneonavicular bar</li></ul><p><strong>AP view</strong></p><ul>- +<p><strong>Calcaneonavicular coalition</strong> is one the two most common subtypes of <a href="/articles/tarsal_coalition">tarsal coalition</a>, the other being a <a href="/articles/talocalcaneal_coalition">talocalcaneal coalition</a>. <span style="line-height:1.6em">As with any coalition may be osseous (synostosis), cartilaginous (synchondrosis) or fibrous (syndesmosis).</span></p><h4>Radiographic features</h4><p>This type of coalition is more easily diagnosed on plain film than a <a href="/articles/talocalcaneal_coalition">talocalcaneal coalition</a>.</p><h5>Plain film</h5><h6>Oblique view</h6><ul><li>best at depicting calcaneonavicular coalition directly as a calcaneonavicular bar</li></ul><h6>AP view</h6><ul>
-</ul><h5>CT</h5><p>CT can be used to confirm the diagnosis where this was equivocal or not seen on plain films. It may allow be used for surgical planning</p><h5>MRI</h5><p>MRI is probably more helpful in assessing and characterising cartilaginous and fibrous coalition and allows assessment of associated bone and soft tissue oedema.</p><h4>Treatment and prognosis</h4><p>As with any <a href="/articles/tarsal-coalition">tarsal coalition</a>, non-operative management may allow some improvement in symptoms initially, but they usually return. Surgical treatment with excision of the coalition is usually required.</p>- +</ul><h5>CT</h5><p>CT can be used to confirm the diagnosis where this was equivocal or not seen on plain films. It may allow be used for surgical planning</p><h5>MRI</h5><p>MRI is probably more helpful in assessing and characterising cartilaginous and fibrous coalition and allows assessment of associated bone and soft tissue oedema.</p><h4>Treatment and prognosis</h4><p>As with any <a href="/articles/tarsal-coalition">tarsal coalition</a>, non-operative management may allow some improvement in symptoms initially, but they usually return. Surgical treatment with excision of the coalition is usually required.</p>
Sections changed:
- Anatomy
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