Fig. 6.

Sonographic images of the normal iliopsoas complex at the level of the acetabulum. (A) Short-axis image demonstrates the anterior inferior iliac spine (AIIS) laterally and the psoas major tendon medially. The rectangle surrounds the neurovascular bundle. (B) Long-axis image showing the normal iliopsoas myotendinous structures overlying the acetabulum with the tendon appearing hyperechoic and fibrillar and the surrounding muscle more hypoechoic. Abbreviations: LFI, lateral fibers of the iliacus muscle; MFI, medial fibers of the iliacus muscle