Table 1. Patient demographic and baseline data.
| Dynesys group (n = 46) | PLIF group (n = 50) | P | |
|---|---|---|---|
| Age (years) | 48.1±12.3 | 52.3±12.9 | 0.11* |
| Gender (male/female) | (31/15) | (37/13) | 0.48† |
| Follow-up time (months) | 53.6±5.3 | 55.2±6.8 | 0.19* |
| Operating levels | |||
| Single level | 32 | 35 | 0.92† |
| L3/4 | 2 | 3 | |
| L4/5 | 17 | 19 | |
| L5/S1 | 13 | 13 | |
| Multiple levels | 14 | 15 | 0.81† |
| L3-L5 | 3 | 2 | |
| L4-S1 | 9 | 10 | |
| L3-S1 | 2 | 3 | |
| Diseases | |||
| Spinal stenosis | 20 | 23 | 0.80† |
| Lumbar disc herniation | 26 | 27 | |
| ROM (°) | |||
| stabilized segment | 7.1±2.2 | 7.3±2.3 | 0.66* |
| the upper adjacent segment | 8.3±2.9 | 8.5±2.1 | 0.70* |
| Disc height (mm) | |||
| stabilized segment | 12.0±2.1 | 12.5±2.3 | 0.26* |
| the upper adjacent segment | 12.3±1.6 | 12.9±1.9 | 0.09* |
| Surgical duration (min) | 103.4±17.9 | 129.4±26.2 | < 0.01* |
| Intraoperative blood loss (ml) | 229.3±56.5 | 363.4±89.1 | < 0.01* |
Values are presented as the mean ± standard deviation.
PLIF, posterior lumbar interbody fusion; ODI, Oswestry disability index; VAS, visual analogue scale; ROM, range of motion.
P values are based on the Mann-Whitney U test * or chi-square/Fisher’s exact test†.