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Table 1 Radiological characteristics of talar coalitions

From: An unusual cause of ankle pain: fracture of a talocalcaneal coalition as a differential diagnosis in an acute ankle sprain: a case report and literature review






osseous bridging

not necessary

not necessary


osseous bridging

not necessary

not necessary


- talar beak navicular overriding the talus

coronal and axial planes

T1 and T2 sequences

- osseous coalitions bony bridging

- bony coalition

- C sign bony bridging between talus and calcaneal sustentaculum

- fibrous coalition

- cartilaginous coalition

- non-osseous coalitions facet narrowing, reactive changes (e. g. cysts, hypertrophy), downward slope or broadening of sustentaculum

fat suppressed sequence (STIR)

- narrowing of the posterior subtalar joint

- bone marrow edema (fracture)

- rounding of the lateral talar process

- lack of depiction of the middle facets on the lateral radiograph

- short talar neck

- dysmorphic sustentaculum tali

Combination of signs sensitivity/specifity 100 %/ 88 %