During carpometacarpal (CMC) abduction, the examiner uses one hand to stabilize the subject's second metacarpal. Her other hand grasps the subject's first metacarpal just proximal to the metacarpophalangeal joint to move it away from the palm and into abduction. Source: The Hand, Measurement of Joint Motion: A Guide to Goniometry, 4e Citation: Norkin CC, White D. Measurement of Joint Motion: A Guide to Goniometry, 4e; 2009 Available at: https://fadavispt.mhmedical.com/DownloadImage.aspx?image=/data/books/1964/norkinjoint4_ch7_f042.png&sec=147190967&BookID=1964&ChapterSecID=147190874&imagename= Accessed: October 25, 2017 Copyright © 2017 McGraw-Hill Education. All rights reserved