Table 2 Radiograph measurements and reliability analysis
From: Radiographic indices for lumbar developmental spinal stenosis
Measurement | Median, mm (±SD) | Interobserver reliability | 95% CI* | Intraobserver reliability | 95% CI* | |
|---|---|---|---|---|---|---|
| Â | Patient | Control | Â | Â | Â | Â |
Foraminal width | ||||||
L1 | 11.8 (1.8) | 13.1 (1.5) | 0.84 | 0.59–0.94 | 0.96 | 0.91–0.99 |
L2 | 11.1 (1.6) | 13.2 (1.8) | 0.78 | 0.43–0.92 | 0.89 | 0.71–0.96 |
L3 | 10.5 (1.9) | 12.8 (1.6) | 0.86 | 0.64–0.95 | 0.93 | 0.83–0.97 |
L4 | 9.5 (1.9) | 11.1 (1.7) | 0.84 | 0.58–0.94 | 0.89 | 0.70–0.96 |
L5 | 8.0 (1.9) | 9.3 (1.6) | 0.72 | 0.27–0.89 | 0.88 | 0.70–0.96 |
S1 | 6.6 (2.0) | 7.5 (1.5) | 0.92 | 0.55–0.99 | 0.86 | 0.63–0.95 |
Pedicle width | ||||||
L1 | 16.5 (2.5) | 17.9 (2.2) | 0.95 | 0.87–0.98 | 0.95 | 0.88–0.98 |
L2 | 16.7 (2.5) | 17.7 (1.8) | 0.97 | 0.93–0.99 | 0.91 | 0.78–0.97 |
L3 | 15.0 (1.9) | 18.3 (1.8) | 0.96 | 0.90–0.99 | 0.89 | 0.72–0.96 |
L4 | 14.6 (2.8) | 17.4 (2.1) | 0.97 | 0.92–0.99 | 0.90 | 0.75–0.96 |
L5 | 11.3 (1.9) | 16.0 (2.5) | 0.95 | 0.86–0.98 | 0.95 | 0.88–0.98 |
S1 | 8.2 (2.3) | 11.2 (3.8) | 0.98 | 0.93–0.99 | 0.93 | 0.81–0.97 |
Posterior pedicle margin | ||||||
L1 | 27.6 (3.8) | 28.0 (3.1) | 0.97 | 0.93–0.99 | 0.98 | 0.95–0.99 |
L2 | 28.5 (4.0) | 27.7 (2.6) | 0.99 | 0.96–0.99 | 0.97 | 0.91–0.99 |
L3 | 29.7 (3.5) | 29.3 (2.4) | 0.98 | 0.94–0.99 | 0.93 | 0.81–0.97 |
L4 | 28.5 (4.4) | 29.7 (2.7) | 0.97 | 0.93–0.99 | 0.93 | 0.81–0.97 |
L5 | 25.6 (4.4) | 27.5 (2.9) | 1.00 | 0.99–1.00 | 0.97 | 0.93–0.99 |
S1 | 20.6 (4.2) | 21.9 (4.0) | 0.99 | 0.98–1.00 | 0.95 | 0.86–0.98 |
Sagittal vertebral body width | ||||||
L1 | 35.6 (4.7) | 35.0 (3.9) | 0.97 | 0.92–0.99 | 0.94 | 0.85–0.98 |
L2 | 37.3 (5.3) | 35.8 (4.3) | 0.97 | 0.91–0.99 | 0.95 | 0.87–0.98 |
L3 | 39.3 (4.6) | 37.2 (4.0) | 0.97 | 0.91–0.99 | 0.96 | 0.90–0.99 |
L4 | 39.7 (3.9) | 36.5 (3.9) | 0.95 | 0.86–0.98 | 0.93 | 0.82–0.97 |
L5 | 39.3 (3.8) | 36.5 (3.7) | 0.97 | 0.92–0.99 | 0.96 | 0.90–0.99 |
S1 | 27.9 (4.0) | 29.4 (3.9) | 0.91 | 0.77–0.97 | 0.90 | 0.75–0.96 |
Sagittal vertebral body height | ||||||
L1 | 29.0 (3.4) | 28.6 (3.6) | 0.97 | 0.91–0.99 | 0.94 | 0.83–0.98 |
L2 | 29.6 (3.4) | 29.9 (2.4) | 0.96 | 0.90–0.99 | 0.87 | 0.67–0.95 |
L3 | 29.3 (3.3) | 30.2 (2.5) | 0.90 | 0.75–0.96 | 0.62 | 0.01–0.85 |
L4 | 28.3 (3.7) | 30.3 (2.3) | 0.95 | 0.88–0.98 | 0.94 | 0.84–0.98 |
L5 | 27.6 (3.9) | 30.0 (2.5) | 0.93 | 0.81–0.97 | 0.94 | 0.85–0.98 |
S1 | 31.6 (3.5) | 32.2 (3.6) | 0.82 | 0.53–0.93 | 0.98 | 0.94–0.99 |
Interpedicular distance | ||||||
L1 | 24.5 (2.3) | 25.9 (2.7) | 0.94 | 0.84–0.97 | 0.96 | 0.89–0.98 |
L2 | 24.8 (2.2) | 26.2 (2.6) | 0.92 | 0.79–0.97 | 0.96 | 0.91–0.99 |
L3 | 26.2 (3.0) | 27.7 (2.1) | 0.97 | 0.92–0.99 | 0.98 | 0.95–0.99 |
L4 | 27.7 (4.0) | 29.7 (2.7) | 0.97 | 0.92–0.99 | 0.98 | 0.94–0.99 |
L5 | 30.7 (4.2) | 34.2 (3.3) | 1.00 | 0.99–1.00 | 0.95 | 0.88–0.98 |
S1 | 34.4 (4.9) | 37.5 (3.2) | 0.99 | 0.96–1.00 | 0.94 | 0.84–0.98 |
Axial vertebral body width | ||||||
L1 | 43.0 (4.2) | 41.6 (4.3) | 0.98 | 0.96–0.99 | 1.00 | 0.99–1.00 |
L2 | 45.7 (4.3) | 42.2 (4.6) | 0.98 | 0.96–0.99 | 0.99 | 0.98–1.00 |
L3 | 47.1 (4.5) | 44.1 (4.8) | 0.99 | 0.97–1.00 | 0.98 | 0.94–0.99 |
L4 | 50.6 (5.0) | 48.2 (4.9) | 0.98 | 0.96–0.99 | 0.94 | 0.84–0.98 |
L5 | 53.7 (5.9) | 55.4 (5.7) | 0.98 | 0.95–0.99 | 0.94 | 0.84–0.98 |
Axial vertebral body height | ||||||
L1 | 25.3 (4.1) | 29.1 (3.1) | 0.98 | 0.96–0.99 | 0.68 | 0.19–0.87 |
L2 | 27.0 (3.9) | 29.9 (2.8) | 0.98 | 0.95–0.99 | 0.98 | 0.95–0.99 |
L3 | 27.2 (3.3) | 30.0 (2.4) | 0.95 | 0.87–0.98 | 0.93 | 0.81–0.97 |
L4 | 26.7 (3.6) | 30.6 (2.7) | 0.92 | 0.80–0.97 | 0.82 | 0.55–0.93 |
L5 | 28.1 (4.4) | 28.1 (4.3) | 0.95 | 0.86–0.98 | 0.78 | 0.43–0.91 |