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Updated: Jun 28, 2026
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Metacarpal Small Incision for Carpal Tunnel Syndrome
Published on: April 5, 2024
Second lumbrical and interossei latency difference in Carpal Tunnel Syndrome
A K Meena1, B Srinivasa Rao, S Sailaja
1Department of Neurology, Nizam's Institute of Medical Sciences, Punjagutta, Hyderabad, Andhra pradesh 500 082, India.
Summary
The second lumbrical and interossei distal motor latency difference (2LIDMLD) effectively diagnoses carpal tunnel syndrome (CTS) across all severity grades. This method is particularly valuable for severe CTS and cases with polyneuropathy when other tests fail.
Area of Science:
- Neurology
- Clinical Electrophysiology
- Nerve Conduction Studies
Background:
- Carpal tunnel syndrome (CTS) diagnosis relies on electrophysiological tests.
- Accurate localization and grading of CTS are crucial for effective management.
- Standard tests may have limitations in severe CTS or concurrent polyneuropathy.
Purpose of the Study:
- To assess the diagnostic utility of the second lumbrical and interossei distal motor latency difference (2LIDMLD) for CTS.
- To compare the sensitivity and specificity of 2LIDMLD against other electrodiagnostic methods.
- To evaluate 2LIDMLD's effectiveness in different CTS electrophysiological grades and in CTS with polyneuropathy.
Main Methods:
- Standardization of 2LIDMLD in healthy controls.
- Prospective evaluation of patients with clinically diagnosed CTS using 2LIDMLD and other standard tests.
- Comparison of test sensitivities in varying CTS severities and in CTS with polyneuropathy.
Main Results:
- 2LIDMLD demonstrated high sensitivity (85.60%) and specificity (96.67%).
- In severe CTS and CTS with polyneuropathy, 2LIDMLD exhibited the highest sensitivity.
- 2LIDMLD provided localization in 16% of severe CTS cases where other methods failed due to absent responses.
Conclusions:
- 2LIDMLD is a sensitive and specific diagnostic tool for all grades of CTS.
- This technique is reliable for diagnosing severe CTS and CTS with polyneuropathy, especially when standard tests are inconclusive.
- The second lumbrical's relative preservation in severe CTS makes 2LIDMLD a valuable localization method.
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