Knee pain and injuries are widespread, particularly in very active people and athletes. A hyperextended knee is a type of injury to the knee caused by the knee bending too far backward. This painful injury is often easy for a doctor to spot and treat.
A hyperextended knee often occurs after high-impact events, such as landing hard after a jump or stopping short when running. Due to the nature of this injury, athletes are most at risk, particularly those involved in contact or extreme sports.
Source: Medical News Today