The sacroiliac joint is composed of the auricular articular surface of sacrum and iliac bone, which is an uneven and mutually embedded auricular articular surface with a tense joint capsule and many strong ligaments wrapped around it, and the range of movement is extremely small, and it is the joint that transmits weight and support from the human trunk to the lower limbs. In addition to the pain in the lumbosacral region, it is very easy to produce some neurological symptoms, such as sciatica, perineal neuralgia and other complex pain manifestations, and even menstrual disorders, frequent urination, urinary urgency, enuresis, impotence, etc., which cannot be cured for a long time. Sacroiliac joint subluxation is divided into anterior subluxation and posterior subluxation: anterior subluxation: occurs in the position of lower limb hip extension and knee flexion, such as strenuous running, long jump or labor with one leg hip extension and knee flexion, and when pushing heavy objects with shoulder, the quadriceps muscle in front of the thigh contracts strongly and pulls the iliac bone forward, and at the same time, due to the action of the ligament behind the sacroiliac joint on the same side, the sacroiliac joint rotates backward, resulting in forward and downward subluxation of the iliac bone. Posterior misalignment: born in the position of flexing the hip and extending the knee of the lower limb, such as when crossing the trench or bending over to carry heavy objects, the posterior muscles of the thigh contract strongly and pull the iliac bone backward, and when the trunk, spine and sacrum rotate to the opposite side in front, resulting in posterior upward misalignment of the sacrum. The causes of sacroiliac joint misalignment are: ① trauma, strain, postpartum, wind, cold and damp invasion, congenital factors. ② secondary to other diseases and injuries, such as: lumbar disc herniation, lumbar strain, spinal stenosis, osteophytes, inflammation of the pelvic viscera …… (need to exclude joint tuberculosis, ankylosing spondylitis, tumor invasion, etc.). 2, clinical symptoms: pain in the lumbosacral region on one side, in heavy cases the affected limb does not dare to land, bear weight and stand, and has difficulty walking. When sitting, the affected side of the hip does not dare to put pressure on the bed, often the hip on the healthy side of the bed, the affected limb to maintain a flexed hip and knee position, turning over with difficulty, lumbosacral pain, or can be radiated along the sciatic nerve pain (or numbness). Symptoms in the saddle area, spasmodic pain in the groin and adductor muscle groups, other visceral manifestations (such as dysmenorrhea, impotence, etc.). 3.Examination signs: pressure pain (articular region, pear-shaped muscle, sciatic nerve stroke, internal revenue muscle group ……). Posterior superior iliac spine inequality, lumbosacral triangle inequality, iliac crest inequality, lower limb inequality, lumbar scoliosis …… Significant pressure at the affected sacroiliac joint, pelvic separation test, “4” test and positive bedside test. 4, auxiliary examination x-ray film: unequal width of joint space, uneven density, pelvic tilt. (or visible) pubic symphysis separation. (1) Supine single knee compression method Indications: Sacroiliac joint subluxation before dislocation. Position: supine, the lower limb of the healthy side is flat and extended, the lower limb of the affected side is flexed at the hip and knee. Hands are placed on the abdomen (to protect the quarter ribs from being crushed). Manipulation: The doctor holds the knee with one hand and the ankle with the other hand, causing the patient to inhale deeply and then hold his breath, while the doctor takes advantage of the situation to press the knee in the direction of the contralateral quadriplegia, popping the pressure three times in succession. At this time, the sound of lumbosacral reset can often be heard, and the operation is completed. (2) Prone heel pressure hip method (bending knee heel-hip method) Indications: dislocation after sacroiliac joint subluxation. Position: patient lying prone with the affected side bending the knee and the heel close to the hip. Manipulation: The practitioner holds one hand against the sacroiliac joint of the affected side, holds the ankle with the other hand, and presses the heel toward the buttocks. During the operation, the ankle can be held and the hip joint can be internally rotated and pressed downward or externally rotated and pressed downward at the same time, at which time the sound of sacroiliac joint reset can often be heard or a sliding sensation can be felt under the hand. (3) Supine hip flexion and knee pressure method (knee division method) Indications: sacroiliac joint subluxation, whether anterior or posterior, unilateral or bilateral, can be reset; lumbosacral joint dislocation; hip subluxation; pseudo lower limb inequality. Position: lying on the back, knees apart, heels together, keeping the nose – umbilicus a heel in a straight line, hands on the abdomen, the whole body relaxed. The patient’s eyes should be slightly closed, and the patient should “keep the Dantian”, then inhale deeply and exhale slowly, and when the exhale is finished, the doctor should press down the separated knees with elastic force with both hands. 2.Adjunctive treatment (1）Acupuncture therapy: for chronic lesions, the lumbosacral area with obvious pressure and pain should be loosened by acupuncture, and then be treated by manual reset, the effect will be better. (2) Silver needle conduction soft tissue relaxation: for patients with acute and chronic pain and heavy inflammatory reaction, apply silver needle conduction and rapidly eliminate local inflammatory lesions to reduce pain. (3) Drug therapy: good analgesic and meridian-activating drug therapy is needed, with tramadol, neurotolepin and analgesic Chinese medicine being preferred.