A Colles fracture involves which bone?

A Colles fracture involves which bone?

• A. Radius
• B. Ulna
• C. Humerus
• D. Fibula

Answer: (A)

A Colles fracture is defined by a fracture of the distal radius near the wrist, typically from a fall on an outstretched hand. This injury usually causes the distal fragment to tilt backward (dorsal displacement), creating the characteristic dinner fork deformity. The radius is the forearm bone that articulates with the wrist, so it is the bone involved in this pattern. The other bones listed—humerus (upper arm), fibula (leg), and ulna (the other forearm bone)—are not the classic site for a Colles fracture.

A Colles fracture is defined by a fracture of the distal radius near the wrist, typically from a fall on an outstretched hand. This injury usually causes the distal fragment to tilt backward (dorsal displacement), creating the characteristic dinner fork deformity. The radius is the forearm bone that articulates with the wrist, so it is the bone involved in this pattern. The other bones listed—humerus (upper arm), fibula (leg), and ulna (the other forearm bone)—are not the classic site for a Colles fracture.