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Transverse oblique sonograms of the anterior aspect of the hip joint. During neutral position of the limb the iliopsoas tendon (straight arrow) adjacent to the iliopectineal eminence (*). During hip flexion, abduction, and external rotation the iliopsoas tendon moves away from the bone (oval shape). When the limb comes back to neutral position, the iliopsoas tendon (curved arrow) follows the reverse path and snaps abruptly against the iliopectineal eminence
