Arthrography of the hip. A, Insertion of 22-gauge spinal needle one fingerbreadth lateral to femoral artery and immediately inferior to anterior superior iliac spine for arthrography. B, In necropsy specimen, areas of hip in which dye may be easily injected: beneath acetabular labrum, in medial or lateral capsular pouch, and at junction of ossified and cartilaginous portion of femoral head. C, Irreducible hip with medial dye pool. (Courtesy John Ogden, MD.) SEE TECHNIQUE 30.1.