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.pressure point: pressure pain in the low back is widespread, 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 spasm and stiffness of one or both sides of sacrospinal muscles. 2.X-ray examination: except for a few congenital malformations of lumbosacral spine and vertebral osteophytes in elderly patients, there are mostly no abnormal findings.