"first arc: is a smooth curve outlining the proximal convexities of the scaphoid, lunate and triquetrum"
"second arc: traces the distal concave surfaces of the same bones"
"third arc: follows the main proximal curvatures of the capitate and hamate"
"The concept of three radiographic arcs was first proposed by Louis A Gilula (1942-2014) in 1979 3,5."
"Gilula three carpal arcs are used in the assessment of the normal alignment of the carpus on PA wrist radiographs:"
Expected headings
"Alignment"
"first arc: is a smooth curve outlining the proximal convexities of the scaphoid, lunate and triquetrum"
"carpal bones have smooth and rounded edges to varying degrees, and lines joining these convexities form arcs; when major convexities are used in drawing"