Charley horse

Charley horse is a popular colloquial term in Canada and the United States for painful spasms or cramps in the leg muscles caused by a punch or knee to the thigh, typically lasting anywhere from a few seconds to about a day. It can also refer to a bruise on an arm or leg and a bruising of the quadriceps muscle of the anterior or lateral thigh, or contusion of the femur, that commonly results in a haematoma and sometimes several weeks of pain and disability. In this latter sense, such an injury is known as dead leg. In Australia it is also known as a corked thigh or corky. It often occurs in contact sports, such as football when an athlete suffers a knee (blunt trauma) to the lateral quadriceps causing a haematoma or temporary paresis and antalgic gait as a result of pain. Another term, jolly horse, is used to describe simple painful muscle cramps in the leg or foot, especially those that follow strenuous exercise.