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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

coalition x-ray CT MRI
calcaneonavicular osseous bridging not necessary not necessary
talonavicular osseous bridging not necessary not necessary
talocalcaneal - 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 %