Editing Openai/695bc248-c9bc-8008-82d2-be391b6b7b32 (section)

===== A) Lateral view (the most important view) =====

: The diagnosis of DISI is primarily made on a true lateral wrist radiograph.
# Dorsal tilt of the lunate
* The lunate’s distal articular surface faces dorsally
* Often described as the lunate “cup” opening posteriorly
# Increased Scapholunate Angle (SLA)
* Normal: approximately 30°–60°
* DISI: typically greater than 70°
* This is the single most quoted numeric criterion in exams
# Increased Radiolunate Angle (RLA)
* Normal: near neutral
* DISI: greater than 10°, reflecting dorsal lunate tilt
# Increased Capitolunate (Lunocapitate) Angle
* Normal: less than 30°
* DISI: greater than 30°, indicating loss of collinearity between lunate and capitate

: Classic exam phrase:
: “DISI on lateral view is characterized by dorsal lunate tilt with an increased scapholunate angle, usually greater than 70 degrees.”