cyma line

cyma line

[sī′mə]
an S-shaped line seen on radiographs at the articulation of the talonavicular and calcaneocuboid bones of the foot. An abnormality in the joint, including pronation or supination of the talar head, appears as a broken cyma line on radiographs.

CYMA line

lazy S-shaped (serpiginous) line through the midtarsal joint (talonavicular and calcaneocuboid joints) on a lateral or a dorsiplantar projection radiograph of the foot; excessive pronation or supination disrupts the CYMA line