Pre- and postoperative NDI scores by cage type.
| NDI | TTN | TCPEEK | P |
| Preoperative, mean | 38.4 | 42.6 | 0.24 |
| Postoperative, mean | 28.3 | 28.1 | 0.12 |
| Change, mean (%) | -10.0 (26) | -14.1 (33) | 0.37 |
Abbreviations: NDI, Neck Disability Index; TCPEEK , titanium-coated polyether-ether-ketone; TTN, titanium.
Level of significane p<0.05.