what is knock injury

A knock injury is a minor injury or blow to the body, such as a bump on the head, a bruised knee, or a scraped elbow. It is a term commonly used in football (soccer) to describe a slight injury from colliding with another player. The term "knock" is often used by commentators to describe a minor injury or tweak that a player has received during a game. A knock injury is also known as a contusion, which is a common soccer injury. Unlike a muscle injury, a knock injury is a surface injury that does not affect the muscles or bones.