Amoss' sign

A·moss' sign

(ā′məs)
n.
An indication of painful flexion of the spine in which it is necessary to support a sitting position by extending the arms behind the torso and placing its weight on the hands.
The American Heritage® Medical Dictionary Copyright © 2007, 2004 by Houghton Mifflin Company. Published by Houghton Mifflin Company. All rights reserved.