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| Follow up (m) | HS | ACDF | p values | |
|---|---|---|---|---|
| NDI | ||||
| Hey 2013 | 24 | 17.8 ± 4.197 | 20 ± 1.44 | 0.506 |
| Kang 2013 | 24 | 16% | 19% | >0.05 |
| Liu 2012 | 6 | 20.0% | 22.2% | >0.05 |
| Shen 2013 | 24.1(18–34) | 22.5 ± 5.1 | 23.1 ± 5.2 | >0.05 |
| Shin 2009 | 24 | 19% | 24% | >0.05 |
| JOA | ||||
| Liu 2012 | 6 | 16.4 ± 0.7 | 16.2 ± 0.7 | >0.05 |
| Shen 2013 | 24.1(18–34) | 16.5 ± 0.9 | 16.3 ± 0.8 | >0.05 |
NDI: Neck Disability Index, JOA: Japanese orthopaedic association, HS: hybrid surgery, ACDF: anterior cervical discectomy and fusion.
