Consequently, rules, designed to decrease the injury rate, have been introduced. Ligament sprains of the knee, primarily involving the medial collateral ligament, also occur.
Ankle sprains are less common due to the skate's protective nature.
Facial lacerations were once very common in youth hockey. However, facial protection has been worn by goalies since the 1950s. Facial protection featuring wire cages and polycarbonate face shields was introduced for use in position players in the late 1970s and has been mandatory since the 1980s. This equipment and rule change has greatly decreased the number of facial lacerations. Eye injuries are also common for children's participation sports.