Table 2 Madrid Sonographic Enthesis Index (MASEI)
DataValue
Inferior pole of the calcaneus: plantar aponeurosis enthesis
Plantar aponeurosis structure(0 or 1)
Plantar aponeurosis thickness >4.4 mm(0 or 1)
Inferior pole of calcaneus erosion(0 or 3)
Inferior pole of calcaneus enthesis calcification(0, 1, 2 or 3)
Plantar aponeurosis enthesis power Doppler(0 or 3)
Superior pole of the calcaneus: Achilles tendon enthesis
Achilles tendon structure(0 or 1)
Achilles tendon thickness >5.29 mm(0 or 1)
Retrocalcaneal bursitis(0 or 1)
Posterior pole of calcaneus erosion(0 or 3)
Posterior pole of calcaneus enthesis calcification(0, 1, 2 or 3)
Posterior pole of calcaneus power Doppler(0 or 3)
Tibial tuberosity: distal patellar ligament enthesis
Patellar ligament structure(0 or 1)
Patellar ligament thickness >4 mm(0 or 1)
Infrapatellar bursitis(0 or 1)
Tibial tuberosity erosion(0 or 3)
Tibial tuberosity enthesis calcification(0, 1, 2 or 3)
Tibial tuberosity enthesis power Doppler(0 or 3)
Inferior pole of the patella: proximal patellar ligament enthesis
Patellar ligament structure(0 or 1)
Patellar ligament thickness >4 mm(0 or 1)
Inferior pole of patella erosion(0 or 3)
Inferior pole of patella enthesis calcification(0, 1, 2 or 3)
Inferior pole of patella enthesis power Doppler(0 or 3)
Superior pole of the patella: quadriceps tendon enthesis
Quadriceps tendon structure(0 or 1)
Quadriceps tendon thickness >6.1 mm(0 or 1)
Superior pole of patella erosion(0 or 3)
Superior pole of patella enthesis calcification(0, 1, 2 or 3)
Superior pole of patella enthesis power Doppler(0 or 3)
Olecranon tuberosity: triceps tendon enthesis
Triceps tendon structure(0 or 1)
Triceps tendon thickness >4.3 mm(0 or 1)
Olecranon erosion(0 or 3)
Olecranon enthesis calcification(0, 1, 2 or 3)
Olecranon enthesis power Doppler(0 or 3)
  • Each item scores one point, except for calcification (0, 1, 2 or 3) and erosion and Doppler signal (0 or 3). The total possible score on both sides (12 entheses) is 136.

  • Sensitivity 83.3%, specificity 82.8%, positive predictive value 80.8%, negative predictive value 85.7%, positive likelihood ratio (LR+) 4.87, negative likelihood ratio (LR−) 0.19.