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Fig. 6B. —15-year-old girl with right snapping iliopsoas tendon. Oblique transverse sonograms just above coxofemoral joint during video recording of right hip motion show changes in iliopsoas tendon after snapping has occurred. Iliopsoas tendon (straight arrow) is anterior to pelvic bone (curved arrows). Flexed and abducted hip is moved toward extension and rotated from external position (A) to more internal position (B). During motion, tendon suddenly displays abrupt abnormal displacement getting suddenly closer to pelvic bone and change in its shape (from round in A to ovoid in B), which are correlated with painful snap felt by patient.