Fig. 2

a Longitudinal suprapatellar knee scan (gray scale): quadriceps tendon enthesis shows loss of fibrillar pattern, hypoechogenicity, and an enthesophyte at the superior pole of the patella. b Longitudinal infrapatellar knee scan showing the inferior patellar tendon enthesitis: there is thickening of the enthesis, hypoechogenicity, loss of the normal fibrillar pattern, and irregularity of the bony cortex with power Doppler signals at the enthesis. c Longitudinal scan right lateral elbow scan showing common extensor tendon enthesis (gray scale): there is thickening of the enthesis, hypoechogenicity, loss of the normal fibrillar pattern, irregularity of the bony cortex, and enthesophyte. d Gray scale longitudinal scan of left patellar fascia showing: increased thickness 5.9 mm, hypoechogenicity, loss of normal fibrillar pattern, and enthesophyte