Carpal angle

Carpal angle is defined by two intersecting lines, one in contact with the proximal surface of the scaphoid and the lunate and the other line through the proximal margins of the triquetrum and the lunate. Its normal value is between 130° and 137°.

It is increased (>139°) in:

• bone dysplasia
• Down syndrome
• Pfeiffer syndrome

It is decreased (<124°) in:

• Hurler syndrome
• Madelung deformity
• Turner syndrome
• Morquio syndrome
• multiple exostoses