A fracture is a break in a bone caused by injury. The document discusses three types of fractures: greenstick fractures, which involve an incomplete break on one side of the bone; spinal fractures, where the break spirals around the bone shaft; and stress fractures, slight breaks from repetitive low impacts rather than a single impact. Therapeutic procedures for treating fractures include fixation to stabilize the bone, reduction to realign bone fragments, and traction applying a pulling force to restore proper alignment.