Accuracy of the Scratch Collapse Test for Carpal Tunnel Syndrome in Comparison With Electrodiagnostic Studies

Hand : Official Journal of the American Association for Hand Surgery
Daniel G AresonRebecca Traub

Abstract

Background: The scratch collapse test (SCT) is a clinical examination maneuver that has been previously reported as a reliable and reproducible test to diagnose carpal tunnel syndrome (CTS). The initial study by Cheng et al in 2008 showed a simple test with high sensitivity. However, subsequent attempts to reproduce those findings have resulted in lower accuracy. Our goal was to evaluate the use of the SCT for patients presenting with symptoms of pain, numbness, or weakness in an upper extremity. Methods: Forty patients were referred to the electrodiagnostic (EDX) lab for evaluation of an upper extremity. One blinded examiner who was familiar with the maneuver performed the SCT on all 40 patients. Another physician or technician performed the nerve conduction study and electromyography. Patient history and accompanying physical examination findings were not revealed to the SCT examiner. Results: The relationship between the SCT performed by a blinded examiner and the EDX performed by blinded examiners was nonsignificant (P = .676) and showed a sensitivity of 0.48, specificity of 0.59, positive predictive value of 0.61, and negative predictive value of 0.45. Conclusion: Based on this study and previous findings by other authors,...Continue Reading

References

Nov 6, 2008·The Journal of Hand Surgery·Christine J ChengSusan E Mackinnon
Jul 16, 2013·The Journal of Hand Surgery, European Volume·H S MakanjiD Ring
May 31, 2014·Journal of Hand and Microsurgery·Robin D BlokDavid C Ring
Sep 4, 2015·Hand : Official Journal of the American Association for Hand Surgery·Kristen M DavidgeSusan E Mackinnon
Oct 24, 2018·Plastic and Reconstructive Surgery. Global Open·Minh N Q HuynhAlexandria Bennett
Dec 1, 2018·Journal of Plastic, Reconstructive & Aesthetic Surgery : JPRAS·Urška Čebron, Catherine M Curtin

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