Utility of Scratch Collapse Test in a Case of Failed Carpal Tunnel Releases

Utility of Scratch Collapse Test in a Case of Failed Carpal Tunnel Releases
The scratch collapse test can be used to localize areas of incomplete release or recurrent scarring in patients with failed carpal tunnel releases. The use of ethyl chloride to temporarily anesthetized the skin superficial to the nerve of interest and "freeze out" a postural response will identify "secondary" areas of compression. This patient presented with bilateral issues. The hierarchal scratch collapse test with ethyl chloride revealed in this patient (1) recurrent compression at the level of the carpal ligament release in the left hand and (2) an incomplete release both proximal and distal to the carpal ligament with distal antebrachial fascia in the right hand.
Table of Contents
00:00 Introduction
00:40 Hierarchy Findings of Scratch Collapse
00:55 Patient Examination
02:23 Scratch Collapse Test
Narration: Susan E. Mackinnon
Videography: Andrew Yee

[@Dr.Kyriazidis]

Question: so why there is no collapse on the right side the very first time we scratched proximal to the release before we even scratch distal to the scar?

[@sangmogl]

It is marvelous . can i get any paper about this ?
thanks

[@CambraiaFernando]

Is there a substitute for ethyl chloride? It's illegal in my country.

[@lizzyva5464]

This video is over 5 years old so the person who posted this has nothing to do with this

[@ralphpal]

the surgeon did a bad job