Final answer:
A fall onto an outstretched, dorsiflexed hand can result in a Colles fracture of the distal radius, a dislocation of the distal radioulnar joint, and a distal ulnar fracture.
Step-by-step explanation:
A Colles fracture of the distal radius is a common injury that occurs when a person falls onto an outstretched, dorsiflexed hand. This type of fracture involves a complete transverse fracture across the distal radius, which drives the separated fragment of the radius posteriorly and superiorly. As a result, the hand is displaced posteriorly and the forearm appears bent like a dinner fork just above the wrist.
Additionally, this injury can also result in a dislocation of the distal radioulnar joint. This occurs when the ulna and radius bones of the forearm separate from each other at the joint.
Finally, a person may also experience a distal ulnar fracture, which is a fracture of the ulna bone in the forearm near the wrist.