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Pilot Study, Aimed at Describing in Myography, the Collapse of the Muscular Response Visualized in the Scratch Collapse Test, in Carpal Tunnel Syndrome.

NCT07248124 · Status: RECRUITING · Phase: NA · Type: INTERVENTIONAL · Enrollment: 25

Last updated 2025-11-25

No results posted yet for this study

Summary

The Scratch Collapse Test (SCT) is a neurocutaneous reflex used to detect peripheral nerve compression in nerve tunnel syndromes. It first involves applying a sensory stimulus to the skin over the suspected nerve compression point, then bilaterally testing the strength of a specific muscle in the patient. Compression is then manifested by a transient loss of strength in the muscle on the affected side, while it is preserved on the healthy side. This loss of strength is transient and disappears after a few seconds. This test can be performed during a patient's clinical examination, with the physician assessing strength or, conversely, muscle collapse. However, while several articles have described the relevance of this test, as well as its sensitivity and specificity, no study has specifically investigated and measured this observed loss of eccentric muscle tone and its unilateral and transient nature, even though the phenomenon of CSP (cutaneous silent period) has been described.

We therefore propose to analyze the myographic tracing obtained in patients diagnosed with unilateral carpal tunnel syndrome. A transient loss of muscle tone is expected by selective needle myography on the pathological side after cutaneous sensory stimulation of the wrist, while cutaneous sensory stimulation on the healthy side does not alter the tracings obtained by myography.

Conditions

  • Carpal Tunnel Syndrome (CTS)

Interventions

PROCEDURE

electromyograph

This examination uses electrodes placed along the path of the median nerve to measure the transmission of nerve impulses (conduction studies). It is performed on both hands to compare the results.

DIAGNOSTIC_TEST

Scratch Collapse Test

The Scratch Collapse Test (SCT) is a neurocutaneous reflex used to detect peripheral nerve compression in nerve canal syndromes. It involves first performing a sensory stimulus on the skin at the suspected nerve compression site, then bilaterally testing the strength of a specific muscle in the patient. Compression is then manifested by a transient loss of strength in the muscle on the affected side, while it is preserved on the stimulated side.

Sponsors & Collaborators

  • Elsan

    lead OTHER

Study Design

Allocation
NA
Purpose
OTHER
Masking
NONE
Model
SINGLE_GROUP

Eligibility

Min Age
18 Years
Sex
ALL
Healthy Volunteers
No

Timeline & Regulatory

Start
2025-11-04
Primary Completion
2026-05-04
Completion
2026-05-05

Countries

  • France

Study Locations

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Read the full study record

This page highlights key information. For complete eligibility criteria, study locations, investigator contacts, and the full protocol, visit the original record on ClinicalTrials.gov.

View NCT07248124 on ClinicalTrials.gov