Elbow Neurological (Nerve Entrapment) Evidence: suggestive

Scratch Collapse Test Special Test

Orthopedic Physical Examination & Clinical Assessment Guide

Scratch Collapse Test Orthopedic Special Test

What is it used for?

  • Detecting nerve compression (Ulnar or Median).

How to Perform

  • Step 1: Patient resists bilateral shoulder external rotation (baseline strength).
  • Step 2: Examiner scratches the skin over the suspected nerve entrapment site.
  • Step 3: Immediately re-test shoulder strength.

Interpretation of Results

  • Positive Test: Temporary loss of muscle resistance (collapse) due to cutaneous gating reflex.

Diagnostic Accuracy

  • Sensitivity: 69%
  • Specificity: 99%

References

  • Magee, D. J. (2021). Orthopedic Physical Assessment.