Intervertebral Disc Rehydration after Lumbar Dynamic Stabilization: Magnetic Resonance Image Evaluation with a Mean Followup of Four Years
Table 4
Comparison of disc signal change between young age and old age.
Variables
Total
Age
P values
<65-year old
≧65-year old
Number of patients
72
37
35
Screw loosening per patient
Yes
16
8 (21.6%)
8 (22.9%)
0.900
No
56
29 (78.4%)
27 (77.1%)
Screw loosening per screw
Yes
19
9 (4.8%)
10 (5.5%)
0.739
No
351
179 (95.2%)
172 (94.5%)
CDS of bridged disc
Pre-op
60.2 ± 25.2
58.9 ± 24.7
62.1 ± 26.1
0.732
Post-op
66.9 ± 26.0**
67.6 ± 28.7**
65.9 ± 22.2
0.800
Mean values are presented ± SD.
**
P < 0.05, the post-op value compared with the pre-op value demonstrated significant difference. CDS: calibrated disc signal.
