One or two-level Fusion Group | Three or More Level Fusion Group | |||||
---|---|---|---|---|---|---|
Union Group (n = 252) | Nonunion Group (n = 30) | p-value | Union Group (n = 49) | Nonunion Group (n = 20) | p-value | |
Age (year) | 59.65 ± 6.55 | 62.57 ± 7.61 | 0.039 | 62.92 ± 5.92 | 65.45 ± 6.48 | 0.213 |
Sex (male/female) | 90/162 | 12/18 | 0.644 | 24/25 | 11/9 | 0.65 |
BMI (kg/cm2) | 26.25 ± 3.36 | 25.79 ± 3.44 | 0.49 | 25.34 ± 2.98 | 26.62 ± 3.53 | 0.158 |
Number of fusion levels | 1.5 ± 0.5 | 1.87 ± 0.35 | < 0.001 | 3.22 ± 0.42 | 3.3 ± 0.47 | 0.516 |
Fusion to S1 (yes) | 88/252 | 15/30 | 0.105 | 22/49 | 14/20 | 0.058 |
Mean HU value of L1-4 | 128.41 ± 40.8 | 114.27 ± 32.3 | 0.116 | 130.74 ± 39.47 | 112.93 ± 41 | 0.097 |
Smoking (yes) | 34 | 9 | 0.028 | 9 | 4 | 0.56 |
MF FI | 0.27 ± 0.11 | 0.34 ± 0.11 | 0.001 | 0.29 ± 0.15 | 0.3 ± 0.1 | 0.338 |
ES FI | 0.21 ± 0.1 | 0.24 ± 0.07(0.23 ± 0.02) | 0.014 | 0.24 ± 0.11 | 0.22 ± 0.09 | 0.579 |
MF rTCSA | 0.49 ± 0.14 | 0.49 ± 0.25 | 0.206 | 0.45 ± 0.12 | 0.41 ± 0.14 | 0.195 |
ES rTCSA | 0.75 ± 0.19 | 0.77 ± 0.26 | 0.773 | 0.7 ± 0.22 | 0.72 ± 0.23 | 0.771 |
PS rFCSA | 0.58 ± 0.16 | 0.54 ± 0.14 | 0.261 | 0.57 ± 0.17 | 0.56 ± 0.15 | 0.853 |