C is for the Cyma line

November 1, 2022

The Cyma line is a sign seen on a a x-ray and appears as a ‘lazy’ S shape that is formed by the midtarsal articulations of the talonavicular and calcaneocuboid joints. This Cyma line should appear smooth and unbroken in a well-aligned foot and disruption in it mean that there are some alignment issues.

In foot X-rays, radiologists and podiatrists typically evaluate various structures, including the bones, joints, soft tissues, and surrounding anatomical landmarks. Common structures assessed on foot X-rays include the bones of the foot (metatarsals, phalanges, tarsal bones), joints (such as the ankle joint), and any potential fractures, dislocations, or abnormalities. The Cyma line is just one of many assessments that are done.


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