Fig 2. Color Doppler images of the STJ from the lateral side in three different levels of Threshold Unit (TU) settings.

(a) with TU setting high, vibration detected on both talus and calcaneus as recognizable by color pixels on both talus and calcaneus; (b) vibration no longer detected in talus = TU_talus; as recognizable by missing color pixels on talus; (c) vibration no longer detected in calcaneus = TU_calcaneus: as recognizable by missing color pixels on calcaneus: T = talus and C = calcaneus.