"Important Details in Performing and Interpreting the Scratch Collapse Test".

The utility of the Scratch Collapse Test (SCT) has been demonstrated in examination of patients with carpal and cubital tunnel syndromes and long thoracic and peroneal nerve compressions. In our clinic, this lesser known test plays a key role in peripheral nerve examination where localization of the nerve irritation or injury is not fully understood. Test utility and accuracy in patients with more challenging presentations likely correlates with tester understanding and experience. This paper offers a clear outline of all stages of the test in order to improve inter-rater reliability. The nuances of test performance are described, including a description of situations where the SCT is deemed inappropriate. Four clinical scenarios where SCT may be useful are included. Corresponding video content is provided to improve performance and interpretation of SCT. (C)2017American Society of Plastic Surgeons