Figure 1 Symptoms, signs, and radiographic findings of a patient with GMC. (A) The patient could not cross his leg while sitting down. (B) The hip joint is fixed in abduction and external rotation when the patient squats and cannot squat with the legs together. (C) The doctor fixed the patient’s pelvis and ankle with the knee flexed at 90°, and then the doctor released the patient, and the patient maintained an upward and abducted position of the affected limb, which was a positive Ober’s sign. (D) Iliac hyperdense line sign (arrow).