Describe the Grade I, II, and III classifications of hamstring injuries. Graded injuries not ...

Hamstring injuries are classified as follows: Grade I injury is a minor strain; Grade II injury is a partial rupture of the muscle; and Grade III injury is a complete tear or rupture of the muscle. Symptoms of a hamstring injury include spasms, tightness, and tenderness of the injured muscle(s). With more severe injuries, swelling and a black and blue or bruised appearance will follow. Tears and strains most often occur where the muscle joins its tendon of insertion or at the origin of the hamstring at the base of the ischial tuberosity.