Table 4 Radiographic and clinical outcome of cage position, cage height subgroup analysis
Parameters | Cage position | Cage height | ||||
|---|---|---|---|---|---|---|
Anterior(N = 48) | Posterior(N = 22) | Significance(P) | 11 mm(N = 34) | 13 mm(N = 36) | Significance(P) | |
Regional Sagittal Lumbar Lordosis (°) | ||||||
 Preoperative Value | 35.1 ± 12.6 | 39.1 ± 8.2 | 0.179 | 32.2 ± 14.2 | 40.2 ± 14.2 | 0.004* |
 Postoperative Value | 27.7 ± 15.3 | 32.1 ± 14.0 | 0.288 | 26.8 ± 14.7 | 31.3 ± 15.1 | 0.006* |
 Follow-Up Value | 37.9 ± 7.4 | 39.8 ± 5.2 | 0.315 | 36.2 ± 7.8 | 40.6 ± 4.8 | 0.021* |
 Preoperative To Postoperative Increase | 2.8 ± 6.4 | 0.7 ± 3.5 | 0.149 | 4.0 ± 7.2 | 0.5 ± 2.9 | 0.011* |
 Preoperative To Latest of Follow-Up Increase | 2.8 ± 6.5 | 0.4 ± 4.0 | 0.128 | 4.3 ± 7.3 | −0.1 ± 2.9 | 0.002* |
Foraminal Height (mm) | ||||||
 Preoperative Value | 13.9 ± 1.5 | 14.8 ± 1.5 | 0.029* | 13.7 ± 1.7 | 14.6 ± 1.3 | 0.022* |
 Postoperative Value | 15.7 ± 2.8 | 16.1 ± 2.8 | 0.514 | 15.5 ± 3.0 | 16.1 ± 2.6 | 0.375 |
 Follow-Up Valuea | 16.5 ± 1.2 | 16.7 ± 0.8 | 0.707 | 16.5 ± 0.9 | 16.6 ± 1.2 | 0.8 |
 Preoperative To Postoperative Increase | 1.7 ± 2.5 | 1.4 ± 2.8 | 0.601 | 1.8 ± 2.7 | 1.4 ± 2.4 | 0.569 |
 Preoperative To Latest of Follow-Up Increase | 2.8 ± 1.8 | 2.3 ± 1.5 | 0.453 | 3.3 ± 1.6 | 1.7 ± 1.4 | 0.004* |
Disc Height (mm) | ||||||
 Preoperative Value | 6.5 ± 2.3 | 7.7 ± 2.4 | 0.047* | 6.1 ± 2.5 | 7.7 ± 2.0 | 0.003* |
 Postoperative Value | 8.6 ± 1.5 | 9.3 ± 1.2 | 0.053 | 8.7 ± 1.3 | 8.9 ± 1.6 | 0.596 |
 Follow-Up Value | 8.7 ± 1.7 | 9.0 ± 1.2 | 0.561 | 8.6 ± 1.4 | 9.0 ± 1.7 | 0.312 |
 Preoperative To Postoperative Increase | 2.1 ± 1.8 | 1.6 ± 1.6 | 0.278 | 2.6 ± 1.9 | 1.3 ± 1.4 | 0.001* |
 Preoperative To Latest of Follow-Up Increase | 2.2 ± 2.0 | 1.2 ± 1.5 | 0.043* | 2.6 ± 2.0 | 1.3 ± 1.6 | 0.023* |
 Latest Follow-Up To Postoperative Decrease (Subsidence) | 0.13 ± 1.1 | −0.35 ± 0.38 | 0.047* | −0.06 ± 0.9 | 0.02 ± 0.99 | 0.713 |
Segmental Lordosis (°) | ||||||
 Preoperative Value | 5.3 ± 3.1 | 6.2 ± 2.9 | 0.248 | 4.2 ± 3.0 | 6.9 ± 2.5 | 0.0001* |
 Postoperative Value | 11.6 ± 4.8 | 10.4 ± 5.2 | 0.32 | 11.9 ± 4.7 | 10.6 ± 5.2 | 0.273 |
 Follow-Up Value | 7.1 ± 2.0 | 6.6 ± 1.4 | 0.266 | 6.8 ± 1.4 | 7.1 ± 2.2 | 0.514 |
 Preoperative To Postoperative Increase | 6.3 ± 5.6 | 4.1 ± 5.2 | 0.128 | 7.7 ± 5.2 | 3.7 ± 5.3 | 0.002* |
 Preoperative To Latest of Follow-Up Increase | 1.8 ± 2.5 | 0.4 ± 2.3 | 0.025* | 2.6 ± 2.7 | 0.2 ± 1.6 | 0.0001* |
CSA of Thecal Sac (mm2) | ||||||
 Preoperative Value | 134.3 ± 23.5 | 142.5 ± 20.4 | 0.162 | 138.1 ± 24.3 | 135.8 ± 21.5 | 0.67 |
 Postoperative Value | 179.0 ± 14.6 | 176.3 ± 17.8 | 0.505 | 179.2 ± 16.0 | 177.2 ± 15.3 | 0.582 |
 Follow-Up Valuea | 174.4 ± 10.8 | 172.3 ± 5.8 | 0.443 | 172.3 ± 8.9 | 175.1 ± 9.1 | 0.358 |
 Preoperative To Postoperative Increase | 44.7 ± 29.5 | 33.8 ± 26.3 | 0.142 | 41.1 ± 32.9 | 41.4 ± 24.9 | 0.969 |
 Preoperative To Latest of Follow-Up Increase | 38.2 ± 29.6 | 31.8 ± 24.3 | 0.494 | 35.2 ± 25.8 | 36.0 ± 30.1 | 0.932 |
VAS Back Pain | ||||||
 Preoperative To the Last Follow-Up Improvement | 2.33 ± 0.98 | 2.4 ± 0.6 | 0.738 | 2.2 ± 0.9 | 2.5 ± 0.8 | 0.214 |
VAS Leg Pain | ||||||
 Preoperative To Last Follow-Up Improvement | 2.6 ± 1.1 | 2.6 ± 0.9 | 0.900 | 2.5 ± 0.7 | 2.6 ± 1.0 | 0.622 |
ODI | ||||||
 Preoperative To Last Follow-Up Improvement | 20.7% ± 10.6% | 20.4% ± 8.0% | 0.912 | 19.0% ± 7.2% | 19.2% ± 9.8% | 0.929 |