The wrist x-ray shows 2 injuries. Radial styloid fracture (Chauffeur’s fracture) & scapholunate dissociation (Terry Thomas Sign).
Chauffeur’ s fracture is named after its occupational origin; during olden days, chauffeurs and cab drivers sustained this fracture while trying to start an old fashioned car with a hand crank.
Associated injuries are – scapholunate dissociation (as in the above x-ray), lunate dislocation, dorsal Barton’s fracture.
While assessing wrist x-rays, if a fracture is identified, keep looking for other injuries. In the x-ray shown, identification of radial styloid injury alone without diagnosing associated scapholunate dissociation can lead to mismanagement of the injury.
Further reading https://www.wheelessonline.com/joints/chauffeurs-fracture-radial-styloid-fractures/