Digit III – Wrist to Palm

Surface Recording Technique, Orthodromic Study
  • Giuliano Gentili
  • Mario Di Napoli

Original Settings

Sensitivity, low-frequency filter, high -frequency filter, sweep speed, duration of pulse, rate of pulse, and the machine used were not specified.


This study was performed in the supine position. The forearm, wrist, and hand were stabilized with Velcro on a comfortable board.


Following the orthodromic method [ 1], the inching test was performed on sensory fibers of the median nerve in digit III (Fig. 1). The sensory potential was recorded with a bipolar fixed distance (2.2 cm); the surface electrode moved centimeter by centimeter from a point 4 cm proximal to the distal wrist crease to a point 6 cm distal to the distal wrist crease, providing 11 measurements (R1–R11). The active electrode (A) was placed proximal to the stimulating cathode (−); the reference (R) was placed distally. The ground (G) electrode position was not specified in the report; the figure shows the ground electrode placed on the palm.


  1. 1.
    Seror P (1998) Orthodromic inching test in mild carpal tunnel syndrome. Muscle Nerve 21:1206–1208PubMedCrossRefGoogle Scholar
  2. 2.
    Bland JDP (2000) A neurophysiological grading scale for carpal tunnel syndrome. Muscle Nerve 23:1280–1283PubMedCrossRefGoogle Scholar

Copyright information

© Springer International Publishing Switzerland 2015

Authors and Affiliations

  • Giuliano Gentili
    • 1
  • Mario Di Napoli
    • 1
  1. 1.Neurological ServiceS. Camillo de’ Lellis General HospitalRietiItaly

Personalised recommendations