aphs: an adequate lumbar spine examination. AIR Am. J. Roentgenot 136.715-717 (1931). 50. Hammoun. Q. M.. Halms. A. H.. Simpson. A. K.. AS:facia. A. & Grauer. J. N. The utility of dynamic flexion-extension radiographs In the initial evaluation of the degenerative lumbar spine. Spine 32.2361-2364 (2007).