Article Figures & Data
Figures
- Figure
Patient selection. MRI, magnetic resonance images; NORDSTEN study, the Norwegian degenerative spinal stenosis study.
Tables
- Table
Changes between the first and second MRI measurements of 65 patients who were scheduled for decompressive surgery in a total of 78 levels due to lumbar spinal stenosis.
Outcome Measure Levels (N = 78) Schizas No change, n (95% CI) 42 (42%–65%) Increased, n (95% CI) 28 (25%–48%) +1 24 +2 2 +3 2 Decreased, n (95% CI) 8 (4.5%–19%) −1 7 −2 1 Dural sac cross-sectional area No change 3 Increased 47 +1–10 mm2 7 +11–20 mm2 7 +21–30 mm2 4 Decreased 28 −1 to 10 mm2 9 −11 to 20 mm2 14 −21 to 30 mm2 5 Spondylolisthesis No change 46 Increased 21 +1 mm 8 +2 mm 9 +3 mm 2 +4 mm 1 +5 mm 0 +6 mm 1a Decreased 11 –1 mm 9 –2 mm 1 –3 mm 1 Forminal stenosis, left No change, n (95% CI) 63 (70%–89%) Increased, n (95% CI) 9 (5%–21%) +1 7 +2 2 Decreased, n (95% CI) 6 (3%–16%) −1 5 −2 1 Foraminal stenosis, right No change, n (95% CI) 64 (72%–90%) Increased (+1), n (95% CI) 7 (4%–18%) Decreased (−1), n (95% CI) 7 (4%–18%) Disc degeneration No change 53 Increased (+1) 12 Decreased (−1) 13 Abbreviation: MRI, magnetic resonance imaging.
Note: Data presented as n for number of levels unless otherwise specified. All patients presented with 2 preoperative MRIs of the lumbar spine within the year before planned surgery. The MRIs were investigated for disc degeneration (Pfirrmann’s classification), foraminal stenosis (Lee’s classification), spondylolisthesis, and central canal stenosis (Schizas score and dural sac cross-sectional area).
↵a Due to lumbosacral transitional vertebra.
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