Table 1.
Results of standard manual measurements
| Preoperative mean ± SD (range) | Postoperative Mean ± SD (range) | Follow-up Mean ± SD (range) | Difference (p value) | |
|---|---|---|---|---|
| GA C2–7 | −10° ± 12.5° (−37° to 14°) | −13.8° ± 11.1° (−38° to 4.5°) | – | |
| SA at CDR-level in neutral position | −1.8° ± 4.4° (−10.5° to 4.5°) | −3.5° ± 3.9° (−12.5° to 3°) | – | |
| GA C2–7 in flexion | −7.1° ± 10.6° (−19° to 22°) | – | 7.0° ± 8.0° (−14° to 20°) | .036 |
| GA C2–7 in extension | −22.6° ± 24.5° (−59° to 4.5°) | – | −38.4° ± 14.4° (−12° to 60°) | .017 |
| Shell angle | – | −5.5° ± 4.9° (−17° to 0°) | −7.1° ± 6.8° (−20° to 4°) | ns |
| SA at the CDR-level in flexion | 3.4° ± 6.4° (−13° to 11.5°) | – | 1.8° ± 4.3° (−4° to 13°) | ns |
| SA at the CDR-level in extension | −1.0° ± 6.5° (−11° to 11°) | – | −9.3° ± 5.5° (−16° to 4°) | <.001 |
| ROM at the CDR-level* | 5.9° ± 5.1° (0°–18°) | – | 11.5° ± 6.3° (3°–26°) | .006 |
| ROM C2–7 | 35.9° ± 15.7° (1°–63°) | – | 45.4° ± 13.6° (22°–65°) | <.01 |
Data of measurements in the table refer to standard manual measurements
GA global alignment, SA segmental angle, ROM range of motion, CDR cervical disc replacement