Abnormal wrist morphology Disruption of carpal arcs 2025-10-30T08:04:07Z The arcs of the Gilula are used on PA wrist radiographs as part of assessing the normal alignment of the carpus. The 1st arc (red) outlines the proximal surfaces and the 2nd arc (yellow) the distal surfaces of the scaphoid, lunate and triquetrum. The 3rd arc (white) outlines the proximal surfaces of the capitate and hamate. Disruption of carpal arcs (i.e., the arcs appear broken or discontinuous on radiographs) indicates a fracture or ligamentous injury in the wrist. Disruption of Gilula carpal arcs