Acta Scientific Medical Sciences (ASMS)(ISSN: 2582-0931)

Research Article Volume 5 Issue 1

Consecutive Changes in Nerve Conduction Studies after Surgery for Carpal Tunnel Syndrome – Useful Parameters for Evaluating Postoperative Recovery

Mikio Muraoka1* and Kenji Watanabe2

1Department of Rehabilitation Medicine, Kameda-Daiichi Hospital, Japan
2Department of Orthopedic Surgery, Kameda-Daiichi Hospital, Japan

*Corresponding Author: Mikio Muraoka, Department of Rehabilitation Medicine, Kameda-Daiichi Hospital, Niigata, Japan.

Received: November 11, 2020; Published: December 14, 2020


Objective: We quantitatively evaluated indicators of postoperative recovery from surgery for carpal tunnel syndrome (CTS) and determined the most sensitive nerve conduction study [NCS] parameters.

Materials and Methods: NCSs were performed in 50 hands with CTS preoperatively, and at 1 and 3 months postoperatively. Four NCS parameters were assessed: abductor pollicis brevis-distal motor latency (APB-DML), index-distal sensory latency (DSL), 2nd lumbrical – interossei latency difference (2L-INT), and ring finger test (Ring).

Results: The 33 hands in which APB compound muscle action potentials (CMAPs) were preoperatively detected showed significant improvement in APB-DML over time. The 46 hands for which 2L CMAPs were preoperatively detected showed significant improvement in 2L-INT over time, clearly reflecting postoperative recovery. Index-sensory nerve action potentials (SNAPs) and Ring-SNAPs were undetected in 41 hands and 50 hands, respectively, and remained undetected at 3 months in 27 hands and 45 hands, respectively.

Conclusion: Our findings suggest that 2L-INT and APB-DML, in this order, are suitable parameters for evaluating postoperative recovery of CTS, while Index-DSL and Ring using SNAPs are not useful.

Keywords: Carpal Tunnel Syndrome; Nerve Conduction Study; Surgery; Median Nerve; Lumbrical


  1. Kohara N. “Clinical and electrophysiological findings in carpal tunnel syndrome”. Brain and Nerve 59 (2007): 1229-1238.
  2. Preston D and Logigian E. “Lumbrical and interossei recording in carpal tunnel syndrome”. Muscle and Nerve 15 (1992): 1253-1257.
  3. Uncini A., et al. “Ring finger testing in carpal tunnel syndrome: a comparative study of diagnostic utility”. Muscle and Nerve 12 (1989): 735-741.
  4. Padua L., et al. “Neurophysiological classification and sensitivity in 500 carpal tunnel syndrome hands”. Acta Neurologica Scandinavica 96 (1997): 211-217.
  5. Rotman M., et al. “Time course and predictors of median nerve conduction after carpal tunnel release”. Journal of Hand Surgery (American volume) 29 (2004): 367-372.
  6. Shiraishi M., et al. “Electrophysiological and anatomical study of the second lumbrical muscle in carpal tunnel syndrome”. Journal of Japanese Society for Surgery of the Hand 8 (1991): 269-272.
  7. Nobuta S., et al. “Clinical results in severe carpal tunnel syndrome and motor nerve conduction studies”. Journal of Orthopaedic Science 10 (2005): 22-26.
  8. Logigian E., et al. “Lumbrical sparing in carpal tunnel syndrome: Anatomic, physiologic, and diagnostic implications”. Neurology 37 (1987): 1499-1505.
  9. Yilmaz F., et al. “Lumbrical-interosseous recording technique versus routine electrodiagnostic methods in the diagnosis of carpal tunnel syndrome”. Turkish Journal of Physical Medicine and Rehabilitation 17 (2017): 230-238.
  10. Lee S., et al. “Diagnostic value of the second lumbrical-interosseous distal motor latency comparison test in severe carpal tunnel syndrome”. Annals of Rehabilitation Medicine 40 (2016): 50-55.
  11. Meena A., et al. “Second lumbrical and interossei latency difference in carpal tunnel syndrome”. Clinical Neurophysiology 119 (2008): 2789-2794.
  12. Sharma V and Wilder-Smith E. “Second lumbrical-interossei latency difference: a strong predictor of median neuropathy at the wrist in uremic patients”. Neurology, Neurophysiology, and Neuroscience 16 (2007): 2.


Citation: Mikio Muraoka and Kenji Watanabe. “Consecutive Changes in Nerve Conduction Studies after Surgery for Carpal Tunnel Syndrome – Useful Parameters for Evaluating Postoperative Recovery". Acta Scientific Medical Sciences 5.1 (2021): 38-41.


Copyright: © 2021 Mikio Muraoka and Kenji Watanabe. This is an open-access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.


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