ImagingSiteKneepSpA (n=13)Non-SpA (n=21)P value
PDUSTibial tuberosityTendon rupture (total or partial)01 (4.8%)0.431
Accompanying bone erosion1 (7.7%)5 (23.8%)0.238
Calcification/enthesophyte00
Intratendinous inflammatory signal4 (30.8%)4 (19%)0.440
Distal patellar tendonTendon rupture (total or partial)00
Accompanying bone erosion00
Calcification/enthesophyte00
Intratendinous inflammatory signal5 (38.5%)7 (33.3%)0.765
Proximal patellar tendonTendon rupture (total or partial)00
Accompanying bone erosion1 (7.7%)00.204
Calcification/enthesophyte00
Intratendinous inflammatory signal3 (23.1%)10 (47.6%)0.159
MRITibial tuberosityTendon rupture (total or partial)00
Accompanying bone erosion00
Calcification/enthesophyte01 (4.8%)0.431
Inflammatory signal (peritendinous)6 (46.2%)5 (23.8%)0.182
Inflammatory signal (intratendinous)1 (7.7%)2 (9.5%)0.857
Inflammatory signal (bone marrow oedema)01 (4.8%)0.431
Distal patellar tendonTendon rupture (total or partial)00
Accompanying bone erosion00
Calcification/enthesophyte00
Inflammatory signal (peritendinous)03 (14.3%)0.160
Inflammatory signal (intratendinous)00
Inflammatory signal (bone marrow oedema)00
Proximal patellar tendonTendon rupture (total or partial)00
Accompanying bone erosion1 (7.7%)2 (9.5%)0.857
Calcification/enthesophyte00
Inflammatory signal (peritendinous)1 (7.7%)00.204
Inflammatory signal (intratendinous)00
Inflammatory signal (bone marrow oedema)00
  • PDUS, power Doppler ultrasound; pSpA, peripheral spondyloarthritis; SpA, spondyloarthritis.