Inclusion Criteria:  All included patient followed the ILAR criteria of JIA and have a hip involvement. This later was defined as the presence of rang motion limitation, and abnormal findings in pelvic radiographic, or ultrasound or MRI in the coxo-femoral joint.  Exclusion Criteria:  The presence of a contraindication to the performance of conventional radiography any disease affecting cognition Patients who have had surgery on the hip