TALOCALCANEAL COALITION

STIR coronal image

STIR coronal image

PDFS-sagittal image

T1-sagittal image

T1-sagittal image

Coronal and sagittal T1, STIR and PDFS sequences in a 30 year old female showing talocalcaneal coaltion.
There is continuity of marrow fat from the talus through the sustentaculum tali.
Secondary signs of talocalcaneal coalition are seen with talar beaking ( on last image).

This 30 year old female presented with rearfoot pain localized to the medial part of the foot along with flat foot.


Talocalcaneal coalition respresents 37 % cases of tarsal coalition with calcaneo-navicular coalition being the most comon type( 53 %).
Talocalcaneal coalition can occur through any of the 3 facets but is most common in the middle facet through the sustentacumum tali. These are best evaluated  on coronal images.
In fibrous coalition, there may be subchondral marrow oedema.

Secondary signs of a talocalcaneal coalition include:
Talar beaking adjacent to talonavicular articulation- also seen on lateral x-rays
Degenerative dorsal changes in calcaneocuboid joint

REFERENCES:

• Stoller DW, Ferkel RD: The Ankle and Foot. Magnetic Resonance Imaging in Orthopaedics and Sports Medicine: Volume I: Third Edition. Lippincott Williams & Wilkins:1009-1013, 2007.
• Radiopaedia.org