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[SpA] Enthesitis patellar tendon

Patient Positioning

Patient lies supine, knee 20°–30° flexed.  Place a small pillow under the joint to keep this position.

Probe Positioning

Place the transducer on a sagittal plane in the midline over the patellar tendon and the distal part of the patella (landmark).

Note: Enthesitis of the patellar tendon in spondyloarthritis with hypoechoic swelling of the tendon and enthesis and positive doppler signal. Minor calcifications closed to the enthesis.