She gradually found that her posture and gait were abnormal, especially when squatting. When squatting, both knees could not come together and both legs had to be separated; when sitting, she could not cross her legs; when lying on her back, both knees were separated; when standing, both lower limbs were mildly externally rotated, and both feet could not come together completely, showing an “outward eight”, and she walked hobbled, especially when walking fast or running. She had an inferiority complex in her heart since then, because of the strange “Chaplin gait” on the stage. But many people did not think it was a disease, and even went to some local hospitals and said it was normal. By chance, the director of Shanghai Tenth People’s Hospital, Sun Yeqing, told Shi that it was a disease. After careful examination by Prof. Sun Yeqing, he was diagnosed as suffering from hip contracture, a disease that can be operated minimally invasively with good results. The day after the surgery, Wang found that the “Chaplin gait” that had plagued him for years had disappeared and he was able to cross his legs when he got off the ground. Two weeks after the surgery, he walked out of the hospital with confidence. A TV reporter interviewed Dr. Sun Yeqing for this reason. Many patients do not realize that they are suffering from hip contracture because they do not know about hip contracture, so they do not seek medical consultation in time. Children who have had intramuscular penicillin injections and are unable to cross their legs smoothly should seek prompt medical attention. The only cure for this condition is surgical release of the contracture band of the gluteus muscle. The surgical technique is now very mature, and the efficacy is very precise. There are no important nerves or blood vessels in this area, and anatomically, the deeper muscles here are thicker and more suitable for injections. Gluteal dystocia is a common disease caused mainly by repeated injections of drugs into the buttocks. According to a survey of 4248 children in a hospital in China, 200 children were found to have injectable gluteus contracture due to repeated intramuscular injections, with an incidence of 4.7%. The onset of gluteus contracture is associated with physical injury caused by needling, chemical irritation caused by drugs, especially those containing benzyl alcohol solution, etc., which leads to aseptic muscle fiber necrosis and the development of muscle fibrosis and scar contracture. Clinical manifestations of gluteal muscle contracture The child initially feels difficulty in squatting, running and jumping, and walks with a limp. Further examination may reveal that the hip joint is restricted in flexion, inversion and internal rotation; the lower extremities cannot come together completely and are mildly externally rotated; when squatting, the hips are abducted and externally rotated, and the knees cannot come together and are in frog position. Most children’s hips do not look as plump as normal hips, and the injected local muscles are atrophied, the skin is sunken, sometimes orange peel-like, and the cord-like capsular band can be palpated. The key to the prevention and treatment of hip contracture: 1. The key to preventing hip contracture in children is that young parents should pay great attention to this disease. Minimize or avoid the injection of toxic and irritating drugs into the hip muscles of sick children, especially drugs diluted with benzyl alcohol should not be used. 2. The injection method and site should be correct, the dosage should be reasonable, the injection speed should be slow, and continuous injection of the same site should be avoided as much as possible. After the injection, local hot compress and physiotherapy should be carried out appropriately to facilitate the absorption of the drug and improve local blood circulation. Once hip contracture is found, early surgery should be performed to completely remove or loosen the contracted scar tissue, and most of the children can recover completely. In conclusion, injection gluteus contracture is a disease mainly involving children found in recent years, and is one of the causes of pediatric lameness. If left untreated, it may further impair the function of both hip joints and develop complications such as pelvic tilt and secondary scoliosis, affecting the normal development. Experts call on the majority of primary care providers to pay full attention to it and patients.