A dramatic injury resulting in partial or complete detachment of the epiphysis from the rest of the bone. A complete avulsion is most common in boys 12–14 years old. It may occur during rapid deceleration, such as when a basketball player comes to a sudden stop or a long-jumper lands, causing the epiphysis to be pulled upward by the contracting quadriceps muscle. The resulting fracture may extend right through the knee joint.
Subjects: Sports and Exercise Medicine.