Table 1.

Quebec task force on spinal disorders classification system [61]

QTF category	Description
1	Pain without radiation
2	Pain + radiation to extremity, proximally
3	Pain + radiation to extremity, distally
4	Pain + radiation to upper/lower limb with neurologic signs
5	Presumptive compression of a spinal nerve root on a simple roentgenogram (that is, spinal instability or fracture)
6	Compression of a spinal nerve root confirmed by specific imaging techniques (that is, myelography, computerized axial tomography or magnetic resonance imaging)
7	Spinal stenosis
8	Postsurgical status, one to six months after intervention
9	Postsurgical status, more than six months after intervention
10	Chronic pain syndrome
11	Other diagnoses (metastases, visceral disease, recent compression fracture, spondylitis)