Preoperativeand postoperativecomparative mean values for spinal canal dimensions at the split laminar levels.
| n=118 | Pre-op | Post-op | Difference | Ratio increase (%) | |
|---|---|---|---|---|---|
| Interfacet distance (mm) | 9.2 ± 3.4 (2.8 - 20.8) | 17.6 ± 2.0 (11.2 -22.1) | 8.4 ± 3.1 (0.7 - 15.8) | 116.6 ± 83.4 (4.5 -564.2) | |
| AP canal diameter (mm) | 9.3 ± 1.6 (5.8 - 13.8) | 15.2 ± 2.0 (11.1 -21.0) | 5.8 ± 2.3 (1.0 - 12.3) | 67.6 ± 34.4 (8.7 -161.8) | |
| Lateral recess depth (mm) | Right | 1.6 ± 0.6 (1.0 -4.1) | 3.9 ± 1.0 (1.3 - 6.3) | 2.3 ± 1.0 (0 -5.0) | 165.1 ± 101.3 (0 - 500.0) |
| Left | 1.7 ± 0.6 (1.0 - 4.9) | 3.9 ± 0.9 (1.7 - 6.0) | 2.1 ± 0.9 (-0.7 -4.6) | 149.3 ± 92.1 (-20.0 -460.0) | |
| Lateral recess angle (in °) | Right | 17.6 ± 5.6 (6.7 -38.4) | 39.1 ± 9.5 (12.4 - 56.5) | 21.5 ± 10.6 (0.7 -45.4) | 145.5 ± 103.3 (3.4 -422.0) |
| Left | 17.9 ± 5.8 (7.2 -32.0) | 37.8 ± 10.4 (16.6 - 58.2) | 19.9 ± 11.1 (0.9 -44.9) | 133.6 ± 106.5 (3.5 ± 449.0) | |
| Cross-sectional area (mm 2 ) | 80.9 ± 25.3 (30.6 - 169.0) | 194.7 ± 30.2 (114.5 -264.2) | 113.8 ± 33.8 (18.1 -189.1) | 163.8 ± 90.2 (15.4 -412.8) |
Values are read as 'Mean ± Standard deviation (Minimum value – Maximum value).'