Subgroup title | No. of trials | No. of participants | Decompression | Cervical instability | Significant difference* |
---|---|---|---|---|---|
Overall | 14 | 479 | YES | YES | PARTIAL** |
Population characteristics | |||||
 Cervical spondylotic radiculopathy | 5 | 207 | YES | NO | PARTIAL** |
 Cervical spondylotic myelopathy | 7 | 197 | YES | NO | YES |
 Other types | 2 | 75 | YES | NO | YES |
Surgical approach | |||||
 Channel technique | 3 | 93 | YES | NO | YES |
 Endoscopic technique | 11 | 386 | YES | NO | YES |