Idiopathic　Chondrolysis　of the　Hip： A case　report．

Abstract

　A 10-year-old　girl　had　a　right　hip　pain　from　2　years　earlier，　and　was　referred　to　us　with　a　3-month history　of　pain　and　functional　impairment　in　the　right　hip．　Physical　examinations　were　unremarkable，　except of　muscle　wasting　of　her　right　thigh.　She　had　severely　restricted　range　of　motion　of　right　hips，　with　a　flexion contracture　of　the　right　hip．　Standard　radiograph　of　the　pelvis　showed　loss　of joint　space　in　the　right　hip．　MRI of　the　hip　revealed　narrowing　of　the　right　hip　joint　space　and　bone　marrow　edema　within　right　femoral　head with　cartilage　loss　and　small　volume　of joint　effusion　with　no　signs　of　synovial　thickening　or　enhancement which　is　characteristic　of juvenile　idiopathic　arthritis（JIA）．　The　diagnosis　of　idiopathic　chondrolysis　of　hip （ICH）was　made．　The　treatment　of　intra-articular　corticosteroid　injection　followed　by　oral　ibuprofen　and physiotherapy　was　started．　Her　symptoms　and　standard　radiograph　findings　improved　6　months　later． 　　　ICH　is　an　unknown　cause　pediatric　musculoskeletal　disorder．　It　presents　with　progressive　articular cartilage　destruction　and　joint　space　narrowing，　resulting　in　secondary　osteoarthritis．　The　cardinal　symptoms of lCH　are　strong　pain　of hip joint　and　disturbance　of excursion．　ICH　occurs　predominantly　in　adolescent　girls， therefere，　it　is　necessary　to　be　differentiated　from　JIA．