"A continuous C-shaped arc, or a C-shaped arc with a posterior interruption on a lateral ankle radiograph, is a feature of TCC of the middle facet of the subtalar joint. This often accompanied by increased attenuation due to an enlarged or dysmorphic sustentaculum tali 2,9, talar beaking 11 due to increased strain on the talonavicular ligament and pes planus. Non-visualisation of the middle facet joint margins can be due to TCC or positioning 6."
"Reported sensitivity of the C sign ranges from 49-56% and sensitivity ranges from 86-100% 6,10."
"Reported sensitivity of the C sign ranges from 49-56% and sensitivity ranges from 86-100% 6,10."
Expected headings
"Radiographic appearance"