Axial pain represents the most common type of low back pain and is only found in the lower back - it does not extend to the buttocks or legs
http://www.spine-health.com/conditions/lower-back-pain/axial-back-pain-most-common-low-back-pain
This website includes materials that are protected by copyright, or other proprietary rights. Transmission or reproduction of protected items beyond that allowed by fair use, as defined in the copyright laws, requires the written permission of the copyright owners.