The most common cause of the loss of shadow of the psoas major muscle is pelvic and spinal fractures, which account for about 2/3; followed by rupture of the retroperitoneal organs (kidneys, bladder, duodenum, and pancreas, etc.) and injuries to the great vessels and soft tissues. So what methods are used for the examination of this disease? The muscle muscle of the psoas major muscle to check the foci, is an important element of abdominal diagnosis, generally using four-point, two-sided method of line check, that is, in the psoas major muscle test on the basis of a positive, respectively, the abdominal point, inguinal point, lateral waist point and lumbar dorsal point of checking the foci. Abdominal point should be the patient to take the side of supine, legs flexed, the doctor’s hands coordinated from the umbilicus lateral abdomen, from shallow and deep, the use of kneading and plucking techniques, so that the thumb gradually leaning to the lumbar vertebral body, the abdominal section of the muscle diagnostic and investigation. In the patient’s serious cooperation, often can touch the lumbar large muscle foci shape sign (see figure). In the groin point diagnosis: the patient takes the supine position, the doctor first from the groin triangle, touch the femoral artery pulsation position; then will check the fingertip to the femoral artery lateral, in the up and down left and right in the circular dialing maneuver, probe the muscle of the groin section of the foci state. The foci in this section of the psoas major muscle are often directly proportional to their condition, i.e. the size of the foci is directly related to the severity of the disease. Lateral lumbar point diagnosis of the psoas major muscle, the patient to take the side lying position, the lower limb of the bed straight. The other lower limb is bent at the knee and lying forward, so that the inner side of the knee joint rests on the bed. Medical practitioners use the pincer bow grip of the fingers and palms of both hands, with the thumb in the lumbar triangle to the deep probe, often in the firm spine muscle outside the front of the lumbar side, checking the lumbar muscle and lumbar small muscle side of the foci of the fascial knot state. The psoas major muscle has lumbar dorsal point exploration, often in the lumbar 1 to lumbar 2 dorsal point, through the vertical spine muscle to the deep conduction effect; for indirect exploration. Most often use the elbow tip compression exploration method, the beginning of which occurs when the injury, the patient responds to the deeper layers of the examined point; produce abnormal pain sensation.