| S1 screw non-loosening group | S1 screw loosening group | P value |
---|---|---|---|
Age | 61.5 ± 7.3 | 65.3 ± 4.7 | 0.011 |
Sex (Male/Female) | 9/37 | 5/27 | 0.656 |
BMI | 26.3 ± 4.3 | 25.8 ± 4.3 | 0.67 |
Number of fused levels | 6.2 ± 1.8 | 6.2 ± 2.0 | 0.968 |
Osteoporosis | 20.6%(7/34) | 75.0%(18/24) | <0.001 |
L1-L4 average T score | −0.6 ± 2.2 | −1.7 ± 1.6 | 0.034 |
T score of total hip joint | −1.0 ± 1 | −1.6 ± 0.7 | 0.033 |
History of smoking | 6.5%(3/46) | 3.1%(1/32) | 0.504 |
Menopause | 78.3%(36/46) | 78.1%(25/32) | 0.989 |
Hypertension | 32.6%(15/46) | 62.5%(20/32) | 0.009 |
Diabetes mellitus | 23.9%(11/46) | 21.9%(7/32) | 0.834 |
Coronary artery disease | 2.2%(1/46) | 12.5%(4/32) | 0.067 |
Fusion rate | 95.7%(44/46) | 90.6%(29/32) | 0.373 |
Interbody fusion | 78.3%(36/46) | 75%(24/32) | 0.789 |
L5/S1 interbody fusion | 19.6%(9/46) | 31.3%(10/32) | 0.237 |
Deep infection | 2.2%(1/46) | 6.3%(2/32) | 0.357 |
Cerebrospinal fluid leakage | 2.2%(1/46) | 0%(0/32) | 0.401 |