Fig 2. Estimation of the pattern of median nerve motion.

During finger flexion and extension movements in normal subjects and mild-CTS and severe-CTS subjects, the median nerve showed non uniform transverse sliding motion over the ulnar-radial plane. (a) Red arrows indicate the direction of lateral displacements of representative pixels within the median nerve as calculated using a speckle-tracking algorithm. (b) Cumulative average lateral displacements (mean and SD values) of the median nerve at different acquisition times during one finger flexion–extension cycle, indicating marked variations of the motion patterns between normal subjects and mild-CTS and severe-CTS patients. Normal, Mild, and Severe indicate normal subjects, mild-CTS and severe-CTS patients.