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Table 2 Comparison of parameters between CS group and non-CS group

From: The value of Hounsfield units in predicting cage subsidence after transforaminal lumbar interbody fusion

Parameters CS group
(n = 82)
Non-CS group
(n = 197)
P
Age (years) 51.7 ± 10.5 50.5 ± 8.1 0.351
Gender (Male) 44 (53.7) 93 (47.2) 0.359
Smoking (n, %) 25 (30.5) 40 (20.3) 0.087
Diabetes (n, %) 12 (14.6) 23 (11.7) 0.552
Fusion level (n, %)    0.452
 L3/4 2 (2.4%) 6 (3.0%)  
 L4/5 43 (52.4%) 118 (59.9%)  
 L5/S1 37 (45.1%) 73 (37.1%)  
Follow-up (month) 18 (14, 25) 18 (15, 24) 0.626
Blood loss (ml) 153.3 ± 46.7 149.2 ± 51.7 0.523
Operation time (min) 170.9 ± 31.4 177.4 ± 30.8 0.118
Use of allograft (n, %) 4 (4.8%) 16 (8.1) 0.339
BMI (Kg/m2) 24.9 ± 1.8 24.3 ± 1.5 0.02
BMD-l −1.1 ± 0.8 −0.2 ± 1.1 < 0.01
BMD-f −2.0 (−2.3, − 1.3) − 0.6 (− 1.3, 0.5) < 0.01
HUm 116.1 ± 16.6 146.0 ± 18.7 < 0.01
HU1 121.2 ± 17.3 149.7 ± 20.7 < 0.01
HU2 114.7 ± 17.3 143.5 ± 19.9 < 0.01
HU3 114.7 ± 19.1 145.3 ± 19.3 < 0.01
HU4 113.9 ± 18.2 145.8 ± 20.2 < 0.01
Cage height (mm)    0.534
 8 14 (17.1%) 30 (15.2%)  
 10 56 (68.3%) 127 (64.5%)  
 12 12 (14.6%) 40 (20.3%)  
Preoperative Disc height (mm) 9.4 ± 0.8 9.6 ± 0.9 0.03
Postoperative Disc height (mm) 12.7 ± 0.9 12.6 ± 0.8 0.09
Follow-up Disc height (mm) 10.8 ± 0.8 11.4 ± 0.9 < 0.01
Modified Taillard index (%) 31.0 ± 4.9 32.5 ± 5.1 0.02
Fusion rate 85.4% 92.4% 0.07
Preoperative VAS of back 5.5 (5, 6) 5.0 (5, 7) 0.27
3 m postoperative VAS of back 2 (1, 3) 2 (1, 3) 0.30
Follow-up VAS of back 2 (1, 2) 2 (1, 2) 0.08
Preoperative VAS of leg 6 (5, 7) 6 (5, 7) 0.48
3 m postoperative VAS of leg 2 (2, 3) 2 (1, 2) < 0.01
Follow-up VAS of leg 2 (1, 2) 2 (1, 2) 0.02
Preoperative ODI 58.5 ± 13.7 58.2 ± 12.3 0.84
3 m postoperative ODI 36.7 ± 9.7 34.4 ± 8.9 0.06
Follow-up ODI 24.6 ± 6.4 22.4 ± 7.7 0.02