In our daily life, we often come across children who go to kindergarten and after a happy play session, they develop pain in the groin of the abdominal muscle the next day and are reluctant to walk. In general, hospital examinations will first consider whether there is a hernia, orchitis, etc. Some people may think that it is synovitis of the hip joint. If the sudden onset of groin pain in children is not a hernia or orchitis, could it be synovitis of the hip joint? Since the hip and sacroiliac joints are close neighbors, it is not easy to distinguish who is right from who is wrong when problems occur. Careless parents think that their children are lying, but after a few days, they feel that something is wrong, because the pain and limp remain unchanged, and then they panic and rush to the hospital. In fact, as long as you check, let the child lie flat on the bed to observe the state of the lower limbs, you will find the phenomenon of long and short legs and yin and yang feet, long and short legs is the two lower limbs are not equal in length, appearing on one side of the long and short, and yin and yang feet refers to the two feet one foot inward and one foot outward. This is the easiest to observe, and then touch the local groin will have pain aggravation phenomenon. All of this helps the family make their own judgments. If you open a book on orthopedics, you will see the term “transient pediatric hip synovitis”. For pediatric groin pain, this diagnosis is absolutely dominant, and those who can manipulate are given manipulation, while those who can’t are put on bed rest. If this disease is not handled properly and the symptoms of lameness are not treated in time, over time there will be muscle atrophy on the affected side of the hip and an imbalance in the development of the hip joint on both sides of the pelvis, which will eventually lead to lifelong lameness, and long-term lameness will cause aseptic ischemic necrosis due to wear and tear of the femoral head, leading to lifelong regret. Even if corrective treatment is carried out later, it will be half the effort. In nearly 20 years of work, we have also come into contact with more than 10 such cases, including the small children of our colleagues, with a high proportion of boys, with roughly the same specific symptoms, the primary symptom being groin pain on one side, followed by claudication. The analysis suggests that because the development of the child is not complete, and because the prevailing diagnosis is synovitis of the hip joint, few people would accept the term misalignment of the joint. However, through palpation and radiography, I still treated the sacroiliac joint as a misalignment, and the effect was immediate. The pain disappears instantly and the limp is gone, but individual children may experience increased hip pain the next day, which is a normal reaction after resetting, and there is no need to panic. It is recommended that the resetting be cured by applying topical swelling and pain-relieving herbs and resting for two to three days.