Fig. 3.

Clinical photographs demonstrating the steps for performing the Scratch Collapse Test. a Patient positioning for the SCT: The patient is seated facing the examiner, back free from the chair, feet on the ground, shoulders adducted and in neutral position, elbows bent at 90°, forearms and wrists in neutral, and fingers in full extension. b The initial resistance applied by the examiner to the dorsal surface of the patient’s forearms. c Scratching the patient’s right (affected) arm just posterior to the medial epicondyle. d Reapplication of resistance to the dorsal forearms and collapse of the patient’s right arm (a positive SCT)