A functional and bilateral ischiofemoral impingement with muscular hypertrophy in an 11-year-old dancer

•Ischiofemoral impingement syndrome (IFIS) is a rare pathology which corresponds to a painful conflict between the ischium and the lesser trochanter.•IFIS has multiple causes in both adults and children.•This diagnosis should be evoked in posterior hip pain in sportsmen and women. Ischiofemoral impingement syndrome (IFIS) is an unusual cause of hip pain. Certain strenuous sports can cause this impingement, such as dancing. We report the case of an 11-year-old ballet dancer with bilateral IFIS secondary to overtraining and hypertrophy of the quadratus femoris. This syndrome is frequently evoked in the field of orthopedics following hip replacement. Bilateral IFIS is rare and should be sought in the context of an intense sport such as dance when any other cause has been eliminated.