Table 2.
Summary of included studies
| Study | Year | Design | Levels | n (# two-level) | Mean FU, months (%) | NDI | VAS neck | VAS arm | SF-36 MCS | SF-36 PCS | ROM |
|---|---|---|---|---|---|---|---|---|---|---|---|
| Oh et al23 | 2014 | R | 1 | 60 CDA | 18 | – | Imp | Imp | – | – | Imp |
| Davis et al9 | 2013 | RCT | 1 and 2 | 225 CDA (225) 105 ACDF |
24 (100%) | Imp | Same | Same | – | – | Same |
| Park et al16 | 2013 | R | 1 and 2 | 75 CDA (10) | 24 | Imp | Imp | Imp | – | – | – |
| Park et al22 | 2013 | R | 1 | 14 CDA | 36 | ||||||
| Yi et al2 | 2013 | R | 1 | 170 CDA | 20 | – | – | – | – | – | – |
| Guérin et al11 | 2012 | PC | 1 and 2 | 71 CDA (12) | 21 | – | Imp | Imp | Imp | Imp | – |
| Guérin et al17 | 2012 | PC | 1 | 40 CDA | 24 | Imp | Imp | Imp | Imp | Imp | Same |
| Lee et al19 | 2012 | PC | 1 | 28 CDA | 24 (78.5%) | Imp | Imp | Imp | – | – | – |
| Huppert et al12 | 2011 | PC | 1 and 2 | 231 CDA (51) | 24 (100%) | Imp | Imp | Imp | – | – | Same |
| Bao et al20 | 2011 | R | 2 | 20 CDA | 16 (100%) | Imp | Imp* | Imp* | – | – | Same |
| Jin et al21 | 2011 | R | 1 | 67 CDA | 12 (76%) | – | Imp | Imp | – | Imp | Same |
| Yi et al14 | 2010 | R | 1 and 2 | 61 CDA (1) | 14 (100%) | – | – | – | – | – | – |
| Beaurain et al18 | 2009 | PC | 1 and 2 | 76 CDA (9) | 24 (100%) | Imp | Imp | Imp | Imp | Imp | Same |
| Park et al10 | 2008 | R | 1 | 32 CDA 21 ACDF |
20 | Imp | Imp | Imp | – | – | – |
| Kim et al15 | 2007 | R | 1 and 2 | 23 CDA (1) | 6 | – | Imp | Imp | – | – | – |
Note:
*
Differentiation between VAS arm and neck scores not provided.
Abbreviations: ACDF, anterior cervical discectomy and fusion; CDA, cervical disc arthroplasty; FU, clinical follow-up; imp, improved; MCS, mental component summary; NDI, neck disability index; PC, prospective cohort; PCS, physical component summary; R, retrospective; RCT, randomized control trial; ROM, range of motion; SF-36, Short-Form 36; VAS, visual analog scale.