Table 3. Mean visual analogue scale (VAS) (10 mm) pain scores* and change scores from baseline to follow-up in studies comparing dynamic stabilization devices with fusion.
| Preoperative | 1 y | 2 y | 4 y | Change score | ||||||
|---|---|---|---|---|---|---|---|---|---|---|
| Dynamic | Rigid | Dynamic | Rigid | Dynamic | Rigid | Dynamic | Rigid | Dynamic | Rigid | |
| VAS low back pain | ||||||||||
| Kaner et al4 (2010) | 7.4 ± 1.1 | 7.9 ± 1.1 | 1.4 ± 0.8 | 1.2 ± 0.7 | 0.8 ± 0.7 | 1.0 ± 1.0 | −6.0† | −6.7† | ||
| −6.6‡ | −6.9‡ | |||||||||
| Korovessis et al2 (2004)§ | 5 ± 1.4 | 4 ± 1.6 | 1.9 ± 1.2 | 1.7 ± 0.6 | – | – | −3.1 | −2.3 | ||
| Lee et al6 (2010) | 6.4 ± 1.9 | 6.7 ± 2.0 | – | – | – | – | 3.4 ± 2.6 | 2.4 ± 2.0 | −3.0 | −4.3 |
| Ozer et al5 (2010) | 6.7 | 7.5 | 2.1 | 3 | 1.1 | 1.0 | −4.6† | −4.5† | ||
| −5.6‡ | −6.5‡ | |||||||||
| VAS lower leg | ||||||||||
| Korovessis et al2 (2004) | 6.9 ± 1.5 | 7.6 ± 1.9 | 2.6 ± 1.2 | 2.5 ± 1.5 | – | – | −4.3 | −5.1 | ||
| Lee et al6 (2010) | 5.8 ± 2.8 | 7.3 ± 1.9 | – | – | – | – | 2.3 ± 2.5 | 1.9 ± 2.2 | −3.5 | −5.4 |
*
Higher scores indicate greater pain.
†
Change score from preoperative to 1 year.
‡
Change score from preoperative to 2 years.
§
The 15 patients who received semirigid fixation are not included in the results.