When the lumbar region is over-rotated or the thighs are over-extended and abducted, it is easy to cause a pulling injury to one side of the psoas major muscle, resulting in congestion, swelling and spasm of the psoas major muscle, which can cause lumbago, abdominal pain, inguinal and perineal cramps, and anterior and medial thigh cramps when the nerves are embedded. The main clinical examination methods are as follows. 1.X-ray examination: except for a few congenital malformations of the lumbosacral spine and vertebral osteophytes in elderly patients, there are no abnormal findings. 2, pressure pain points: the pressure pain range of low back is wider, and the pressure pain points are mostly at the back of sacroiliac joint, back of sacrum and transverse process of lumbar vertebrae. In mild cases, the pressure pain is not obvious, but in severe cases, the pressure pain can be accompanied by spastic stiffness of one or both sides of the sacrospinal muscles. The most simple way to identify these two diseases is that the former pain is confined to the lower back, while the latter pain radiates to the buttocks, thighs, calves or feet; in mild cases of lumbar strain, the pain may only reach the buttocks. In mild lumbar synostosis, bed rest, sleeping on a hard bed, physical therapy and hot compresses are all that is needed, and at most, traction; lumbar strain can be relieved by rest.