A knee injury is a common injury that can be caused by a variety of activities. The term 'knee injury' can refer to a range of injuries, from minor scrapes and bruises to more serious ligament tears or fractures. The crossword solution for the term 'knee injury' is SCRAPE, which is a type of minor injury that can occur when the skin is rubbed against a rough surface. Scrapes can cause pain, swelling, and bleeding, but usually heal quickly with proper care.