A Colles' fracture is a break of the radius bone in the lower forearm just above the wrist. It causes the wrist to bend backwards and shorten. Colles' fractures most commonly occur in older adults due to osteoporosis, when attempting to break a fall by extending the arms out in front. Treatment focuses on restoring the alignment and function of the wrist through casting or surgery. Prevention strategies include maintaining bone health through calcium intake and exercise, and fall prevention measures like home safety modifications and mobility aids.