Fig. 2.

(US images on the left): US Sagittal scan obtained at the direct tendon (black arrows) and indirect tendon (white arrows) of the rectus femoris muscle (RF). The image on the top was obtained by scanning at the medial level as compared to the image below. (MR images on the right): T1-weighted MR image corresponding to the US scans. The direct tendon shows a homogeneous and hyperechoic appearance. Its insertion on to the anterior-inferior iliac spine is well visible on the US image. In physiological conditions the tendon is thicker just before insertion. In B, the indirect tendon appears hypoechoic because of anisotropy.