Demographic Characteristics and Medical Service Use of Failed Back Surgery Syndrome Patients at an Integrated Treatment Hospital Focusing on Complementary and Alternative Medicine: A Retrospective Review of Electronic Medical Records

Table 2

Evaluation of postsurgery MRI or CT findings ()^a.

Radiological findings of MRI/CT scans
Herniation of nucleus pulposus	223 (77%)
Spinal stenosis	53 (18%)
Epidural fibrosis	7 (2%)
Spondylolisthesis	7 (2%)
Vertebral fracture	3 (1%)
Other^b	10 (3%)
Operated disc levels
L1/2	6 (2%)
L2/3	10 (3%)
L3/4	40 (14%)
L4/5	169 (58%)
L5/S1	96 (33%)
Types of surgery
Laminectomy	206 (72%)
Fusion	28 (9%)
Other^c	13 (5%)
Recurrence at operated disc level
Same level, ipsilateral side	95 (33%)
Same level, contralateral side	30 (10%)
Different level	98 (34%)
Undefined^d	65 (23%)

^aPatients whose MRI/CT scan readings were interpreted by radiologists at the study site. Duplication was allowed in all records except relapse with regard to site of surgery. Due to inability to radiologically identify any evident sign of surgery, the surgical area and types of surgery were excluded in 52 patients.
^bFacet arthrosis, retrolisthesis, spondylitis, and tumors.
^cVertebroplasty, disc replacement, and facetectomy.
^dCases of pain where no definite relation could be identified between pain and intervertebral disc and cases where the site of surgery could not be identified radiologically.