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The scratch collapse test (SCT) correlates with nerve conduction studies in carpal tunnel syndrome (CTS) diagnosis. This maneuver helps identify nerve compression, supporting its clinical use.

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Area of Science:

  • Orthopedics
  • Neurology
  • Diagnostic Medicine

Background:

  • Carpal tunnel syndrome (CTS) diagnosis can be challenging for surgeons.
  • Electrodiagnostic studies (EDS) are the gold standard, but the scratch collapse test (SCT) offers a potential alternative.
  • The diagnostic utility of the SCT remains debated.

Purpose of the Study:

  • To determine if the SCT correlates with findings from electrodiagnostic studies in CTS patients.
  • To assess if the SCT can identify objective changes in nerve measures.

Main Methods:

  • A retrospective review of 350 patients with CTS who underwent both EDS and SCT.
  • Collection of demographic data and sensorimotor amplitudes, latencies, and velocities from nerve conduction and EMG studies.
  • Statistical analysis of SCT findings against analogous electrodiagnostic values.

Main Results:

  • Patients with a positive SCT showed significantly lower sensory and motor nerve conduction velocities and amplitudes.
  • Observed nerve conduction changes were more pronounced in thinner patients compared to obese patients.
  • All significant changes were identified through nerve conduction studies, not electromyography.

Conclusions:

  • The SCT demonstrates correlation with nerve conduction study findings in CTS.
  • The SCT appears to identify nerve compression, specifically axonal and myelin damage, indicated by reduced amplitudes and velocities.
  • These findings support the SCT's role as a valuable diagnostic tool for evaluating carpal tunnel syndrome in select patients.