Final answer:
An injury affecting one hand following a fall onto an outstretched hand is known as a Colles fracture. It is especially common in older individuals or during high-impact sports like snowboarding.
Step-by-step explanation:
An injury that affects one hand is called a Colles fracture. This injury is a type of fracture across the distal radius, which occurs following a fall onto an outstretched hand. The separated distal fragment of the radius is driven posteriorly and superiorly, resulting in a 'dinner fork' deformity of the forearm just above the wrist. Colles fracture is the most common forearm fracture and tends to occur in persons over the age of 50 or in activities that involve a high-speed fall, such as snowboarding or skating. Hand injuries can cause significant functional impairment and are more common in older people with conditions like osteoporosis.