Optimal recording electrode placement in the lumbrical-interossei comparison study

Amer Al-Shekhlee, Jose A. Fernandes Filho, Devraj Sukul, David C. Preston

Research output: Contribution to journalArticlepeer-review

14 Scopus citations


The lumbrical-interossei comparison study is commonly employed in the electrodiagnosis of carpal tunnel syndrome. Placement of the recording electrodes relies on anatomic landmarks as the muscles being recorded cannot be seen or palpated. To determine the optimal active electrode location, 15 controls and 5 patients were studied using a grid of 12 electrodes placed over the lateral palm. Amplitudes, rise-times, and latencies of the responses at each location were measured. The lowest control latency difference was located in the lateral mid-proximal palm (mean 0 ms, upper range of 0.5 ms). This location also had the highest lumbrical amplitude and rise-time. More distal in the palm, the mean latency difference increased to 0.5 ms with an upper range of 0.9 ms. When performing the lumbrical-interossei comparison study, it is essential to place the active recording electrode in the optimal location. Failure to do so will result in an increased number of false-positive studies.

Original languageEnglish (US)
Pages (from-to)289-293
Number of pages5
JournalMuscle and Nerve
Issue number2
StatePublished - Feb 2006
Externally publishedYes


  • Carpal tunnel syndrome
  • Electromyography
  • Interossei
  • Lumbrical
  • Nerve conduction studies

ASJC Scopus subject areas

  • Physiology
  • Clinical Neurology
  • Cellular and Molecular Neuroscience
  • Physiology (medical)


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