Table 3 Summary of MRI evaluation
Parameter | Grade | preoperative | postoperative | Change value | Change rate % | P |
|---|---|---|---|---|---|---|
Midsagittal canal diameter | A | 10.96 ± 2.69 | 12.43 ± 2.45 | 1.48 ± 1.16 | 15.85 ± 17.58 | 0.011 |
B | 9.27 ± 2.35 | 11.30 ± 2.49 | 2.03 ± 1.69 | 24.42 ± 21.49 | 0.249 | |
C | 7.37 ± 2.19 | 9.58 ± 2.29 | 2.18 ± 1.74 | 41.37 ± 76.16 | 0.362 | |
D | 4.39 ± 2.52 | 6.89 ± 2.40 | 2.50 ± 1.25 | 79.69 ± 86.23 | – | |
Axial central canal area | A | 161.43 ± 56.25 | 185.00 ± 51.93 | 23.57 ± 15.14 | 17.12 ± 13.24 | 0.073 |
B | 128.11 ± 47.55 | 148.68 ± 49.18 | 20.57 ± 15.68 | 18.58 ± 15.51 | 0.222 | |
C | 81.96 ± 25.90 | 103.40 ± 31.74 | 21.44 ± 20.07 | 29.64 ± 27.73 | 0.104 | |
D | 32.61 ± 11.10 | 49.72 ± 17.47 | 16.11 ± 10.70 | 52.91 ± 34.41 | – |