In young adults, recurrent hip pain is diagnosed by X-ray as “acetabular dysplasia” or “hip impingement syndrome”, or no obvious abnormalities are seen. Even routine CT and MRI examinations do not show any significant abnormalities, so they are often treated as “hip synovitis”, but with poor results. At this time, we should consider “acetabular dysplasia”, “acetabular impingement syndrome”, or acetabular glenoid injury caused by minor trauma, or cartilage injury of the hip joint, and we should recommend MRI of the hip joint. In the past, we had a shallow understanding of hip dysplasia, hip impingement syndrome and acetabular labral injury in young people, and most of them were treated as “hip synovitis” and “soft tissue injury of the hip”. After resting for 3-4 weeks, the pain around the hip joint reappears after resuming daily activities or sports. The patient’s pain did not resolve well. The procedure of hip MRI: first iodine allergy test, if the result is negative, you can directly use compound pantopamine; if it is positive, or if there is a history of iodine allergy, you can use “iopidol”. Fluoroscopy and MRI will then be scheduled. The hip joint will be disinfected under fluoroscopy, sheeted, local anesthesia, punctured, and a small amount of iodine will be injected to confirm the puncture into the joint cavity. 10-20 ml of 0.8-1% gadopentetate will be injected, and the hip joint will be slightly moved without weight, and the MRI will be performed within 20-40 minutes. Advantages: 1. It can clearly show the lesions in the hip joint, such as acetabular labral injury, hip cartilage injury, hip synovial lesion, hip cartilage free body, femoral head round ligament rupture, subchondral cystic lesion, periacetabular cyst, etc. 2.No radiological damage to human body. Disadvantages: 1, the test is invasive; half of the hip joint pain and weakness after the operation for 24-48 hours, the drug is absorbed and excreted through urine. 2.Some patients are nervous and experience weakness, dizziness and panic after the operation and examination, which will be relieved after 5-10 minutes of rest. 3.The examination takes a long time and requires an appointment. 4, the body with pacemakers, electronic implants, etc. can not be examined, the hip joint near the paramagnetic implants such as iron-nickel-copper, due to more artifacts, the examination effect is not ideal. 5, Individuals with “claustrophobia” cannot insist on completing the examination. On the whole, the examination is basically non-invasive, non-radiographic and has a strong diagnostic ability.