A
Volar displacement and volar angulation of the distal fragment
B
Dorsal displacement and volar angulation of the distal fragment
C
Dorsal displacement and dorsal angulation of the distal fragment
D
Volar displacement and dorsal angulation of the distal fragment
Explanation:The correct option is 'c'. A classic Colles' fracture is an extra-articular fracture of the distal radius characterized by dorsal displacement, dorsal angulation (apex volar), radial shift, and radial shortening. This results in the classic 'dinner fork' deformity seen clinically. A fracture with volar displacement and volar angulation (option a) is known as a Smith's fracture (reverse Colles).
Reference: Jupiter JB. Fractures of the distal end of the radius. J Bone Joint Surg Am. 1991;73(3):461-469. / Colles A. On the Fracture of the Carpal Extremity of the Radius. Edinburgh Med Surg J. 1814;10(38):182-186.