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Updated: Jul 29, 2025

A Cost Effective and Adaptable Scratch Migration Assay
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The Scratch-Collapse Test: A Systematic Review and Statistical Analysis.

Nirbhay S Jain1, Brian Zukotynski1, Meaghan L Barr1

  • 1University of California, Los Angeles, USA.

Hand (New York, N.Y.)
|May 24, 2023
PubMed
Summary
This summary is machine-generated.

The scratch-collapse test (SCT) is a valuable confirmatory tool for diagnosing nerve compression, showing high specificity (94%) but low sensitivity (38%). It aids hand surgeons but isn't a primary screening method.

Keywords:
carpal tunnel syndromediagnosisnervenerve compressionnerve injury

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Area of Science:

  • Orthopedics
  • Neurology
  • Diagnostic Medicine

Background:

  • The scratch-collapse test (SCT) is a provocative maneuver for diagnosing compressive neuropathies.
  • Its clinical application remains debated despite supporting studies.
  • This review provides statistical data on SCT outcomes to clarify its diagnostic role.

Approach:

  • A systematic literature review was conducted following PRISMA guidelines.
  • Data on SCT outcomes and gold standard electrodiagnostic studies were extracted.
  • Pooled sensitivity, specificity, and kappa statistics were calculated using statistical software.

Key Points:

  • Overall SCT sensitivity was 38% and specificity was 94% (kappa ≈ 0.4) for carpal tunnel, cubital tunnel, and peroneal neuropathies.
  • Sensitivity and specificity varied by condition, being higher for cubital tunnel and peroneal syndromes than carpal tunnel syndrome.
  • Data for pronator syndrome were insufficient for analysis.

Conclusions:

  • The SCT is a useful adjunct diagnostic tool for hand surgeons.
  • Its low sensitivity and high specificity support its use as a confirmatory, not screening, test.
  • Further research is needed to explore subtler applications of the SCT.