The effect can be seen immediately after manual reduction. Generally, the traction technology of "separation and combination" is used first to release the synovium embedded in the joint and buffer the muscle tension. For patients with forward rotation and displacement of ilium, overstretch the affected hip, tighten the quadriceps femoris and ilium ligament, and make ilium rotate forward and reset. After repair, use wide adhesive tape for circular fixation, and start functional exercise after three weeks' rest to avoid recurrence. After the sacroiliac joint sprain, the emotional sacroiliac part is painful, malrotation, pale face and even shock. The ipsilateral lower limbs dare not bear weight, the trunk leans forward, and the affected side. About 20% ~ 60% of patients have radiation pain in the ipsilateral lower limbs, mostly in the distribution area of sciatic nerve in hip, posterior thigh (cutaneous nerve of thigh) and anterior medial thigh root. The causes of radiation pain are: 1. 2. The sciatic nerve or posterior femoral cutaneous nerve bundle is close to the anterior side of sacroiliac joint and piriformis muscle. When the ligament around sacroiliac joint bleeds due to sprain, swelling or piriformis muscle spasm, it can directly stimulate the nerve bundle and cause radiation pain. 3. Lumbosacral joint sprain combined with sacroiliac joint sprain can also stimulate nerve roots and cause sciatica. During the examination, we can find: three-dimensional posture, when standing, the trunk leans to the healthy side, with the healthy side bearing the weight, the affected side waist and toes touching the ground, and the affected side buttocks supported by hands, reducing activity and pain. Sitting posture, when sitting, take health as the premise, load the ischial tubercle, and support with both hands to reduce the load. In bed posture, the patient sits by the bed first, and then holds the affected limb with both hands to prevent sacroiliac joint pain. The pelvic separation test was positive and the adductor muscle was tense. Sacroiliac joint rotation test was positive. Straight leg elevation is limited. The posterior superior iliac spine is higher or lower than the contralateral spine. Tenderness is in the posterior superior iliac spine.