A quadriceps strain, or pulled quadriceps muscle, is the injury that results from damage (overstretching, tearing or rupture) of one of the four quadricep muscles in the upper front portion of the thigh.This injury is most usually caused by explosive contractions of the muscle, typically while trying to change directions, jump or start running. Pain (usually acute) is the most common symptom, accompanied by swelling and discoloration around the site of the injury. Muscle spams, or knots in the muslce, are also very commonly experienced by those affected by an injury of this type. Thigh compression sleeves or compression shorts can help to reduce vibration of the muscles in the quadriceps area and therefore reduce the incidence of strains, or accelerate healing of a strained muscle. Please consult your doctor for guidance in choosing a product suited to your particular injury.