• Jie Wen, Hong Liu, Sheng Xiao, Xin Li, Ke Fang, Zhongwen Tang, Shu Cao, Fanling Li, Guangqing Cai, and Chen Hu.
• Department of Pediatric Orthopedics, Hunan Provincial People's Hospital, the First Affiliated Hospital of Hunan Normal University, Changsha, Hunan, China.
• Medicine (Baltimore). 2018 Dec 1; 97 (51): e13199.

RationalePain in the hip joint is a common symptom in children. The common diseases leading to pain in the hip joint in children include transient synovitis of the hip, septic arthritis of the hip, and Legg-Calve-Perthes disease.Patient ConcernsA 7-year-old boy was admitted due to pain in the right hip joint and limping for more than 1 month.DiagnosisSynovial chondromatosis.InterventionsThe patient underwent a hip open surgery, all the loose bodies in articular capsule were removed.OutcomesAt the 6-month follow-up, pain and limping disappeared, and the range of activity of the hip joint was restored to a normal level.ConclusionsSynovial chondromatosis is an uncommon disease which can cause pain of hip joint in children.LessonsWhen the pediatric orthopedic surgeon treats the children suffered with hip pain the surgeon should be aware of this rare disease.

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