Intervertebral Disc Rehydration after Lumbar Dynamic Stabilization: Magnetic Resonance Image Evaluation with a Mean Followup of Four Years

Table 3

Comparison between young age and old age.

Variables	Total	Age		P values
		<65-year old	≧65-year old
Number of patients	72	37	35
Age (years)	61.4 ± 11.3	53.0 ± 9.0	70.3 ± 4.8	<0.001*
Gender
Male	37	23 (62.2%)	14 (40.0%)	0.060
Female	35	14 (37.8%)	21 (60.0%)
Number of instrumented levels
One	31	17 (45.9%)	14 (40.0%)	0.611
Two	41	20 (54.1%)	21 (60.0%)
Mean pre-op scores
VAS back pain	6.3 ± 3.3	6.1 ± 3.4	6.4 ± 3.1	0.811
VAS leg pain	7.0 ± 2.7	6.7 ± 3.0	7.4 ± 2.3	0.497
ODI (%)	51.1 ± 19.6	50.4 ± 21.3	51.7 ± 17.8	0.612
Mean 24-month post-op scores
VAS back pain	2.8 ± 2.9	2.9 ± 2.9	2.7 ± 2.9	0.754
VAS leg pain	2.6 ± 3.2	2.7 ± 3.1	2.4 ± 3.2	0.474
ODI (%)	23.4 ± 21.4	21.8 ± 22.0	25.2 ± 20.8	0.291
Serum glucose status
Type 2 DM	15	3 (8.1%)	12 (34.3%)	0.006*
Euglycemia	57	34 (91.9%)	23 (65.7%)
Blood pressure
Hypertensive	9	4 (10.8%)	5 (14.3%)	0.656
Normotensive	63	33 (89.2%)	30 (85.7%)

Mean values are presented ± SD.
* P < 0.05, statistically significant.
DM: diabetes mellitus.
VAS: visual analogue scale.
ODI: Oswestry disability index.