Table 3. Function and neck pain following single-level and multilevel C-ADR.*.
| NDI Mean score (% change from preop) | VAS neck pain Mean score (% change from preop) | |||||
|---|---|---|---|---|---|---|
| Single | Multi | P | Single | Multi | P | |
| Preop | ||||||
| Huppert et al 5 (2011) | 51.5 | 51.4 | NS | 5.3† | 5.1† | NS |
| Kim et al 6 (2009) | 25.3 | 26.4 | NS | 8.3 | 8.8 | NS |
| Pimenta et al 4 (2007) | 48 | 44 | NS | 8.6 | 8.5 | NS |
| 1 year | ||||||
| Huppert et al 5 (2011) | 25.5 (50.5) | 30.0 (41.6) | NR | 2.1 (60.4) | 2.2 (56.8) | NR |
| Kim et al 6 (2009) | 7.6 (69.9) | 7.8 (70.5) | NS | 3.7 (55.4) | 3.3 (62.5) | NS |
| Pimenta et al 4 (2007) | 27 (43.8) | 20 (54.5) | NR | 3.3 (61.6) | 3.0 (64.7) | NR |
| 2 years | ||||||
| Huppert et al 5 (2011) | 27.3 (47.0) | 29.2 (43.2) | NS | 2.4 (54.7) | 2.4 (52.9) | NS |
| Pimenta et al 4 (2007) | 26 (45.8) | 22 (50.0) | NR | 3.0 (70.0) | 2.7 (68.2) | NR |
| 3 years | ||||||
| Pimenta et al 4 (2007) | 21 (56.3) | 11 (75.0) | NR | 4.0 (53.5) | 1.5 (82.4) | NR |
*
C-ADR indicates cervical artificial disc replacement; NDI, Neck Disability Index; VAS, Visual Analog Scale; preop, preoperative; NR, not reported; and NS, not statistically significant.
†
Pain scores from Huppert et al 5 were normalized from a VAS 100 mm scale to a VAS 10 mm scale for comparison purposes.