患儿,女,7岁。因两年来四肢关节反复疼痛,半年来步态不稳入院。入院前两年自觉左下肢及左髋关节疼,半年后出现间断发热,右侧膝、髋、腰骶部疼,无红肿。近半年来四肢关节疼痛加重,步态不稳,四肢末端肌肉萎缩,曾服消炎痛、新诺明及雷米封,疼痛可缓解,停药则加重。患儿为足月顺产第二胎,既往健康,姐9岁,体 Children, female, 7 years old. Due to repeated pain in the limbs and joints for two years, the gait was unstable in the past six months. Two years before admission, conscious left lower extremity and left hip pain, intermittent fever after six months, the right knee, hip, lumbosacral pain, no swelling. In the past six months, the exacerbation of joint pain, unsteady gait, muscle atrophy of the extremities, and indomethacin, cotrimoxazole and lemifarn relieved pain and increased withdrawal. Children with full-term second trimester of childbirth, past health, sister 9 years old, body