Method for the measurement of the intrascaphoid angle (ISA) (A) and scapholunate angle (SLA) (B). (A) ISA was measured as the angle between the perpendicular lines on the distal and proximal articular surfaces of the scaphoid in the lateral CT image. (B) SLA was measured as the angle between the long axis of the scaphoid (tangent on the volar cortex of the scaphoid) and the long axis of the lunate (axis connecting the midpoints of the proximal and distal arcs) in the lateral view of plain radiography of the wrist.