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Fig. 1B. —Drawings show arterial blood supply to femoral head. Oblique sagittal section along femoral neck, corresponding to sonographic plane. Anterior recess of joint space is larger to better depict anatomic relationships. A = anterior layer of capsule, P = posterior layer of capsule, E = osseous nucleus of epiphysis of femoral head, C = articular cartilage of acetabulum and femoral head.