Ultrasound detection of knee patellar enthesitis: a comparison with magnetic resonance imaging

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Figure 1 .

(A) A sagittal US scan shows thickened proximal entheses of the patellar ligament with loss of its fibrillar echo pattern, loss of the sharp definition of its posterior aspect compared with the distal portion (arrow head), calcific foci (arrow). (B) A transverse US scan of the same patient shows the thickened medial part of the patellar ligament with calcific focus (arrow). (C) A sagittal T₂ fat suppression image shows the thickened distal part of the patellar tendon with altered signal intensity (arrow head) and prepatellar bursitis (arrow). (D) A sagittal Pd weighted image shows high intensity signals of the proximal patellar tendon.