Table 1.
Mean pedicle CT measurements as determined for the various vertebral levels, where the linear parameters (i.e. OPW, OPH, IPW, IPH) were measured at the isthmus of the pedicle and angular parameters (i.e. PTA, PSA) characterize the pedicle axis
| Pedicle | OPW (mm) | OPH (mm) | IPW (mm) | IPH (mm) | PTA (°) | PSA (°) |
|---|---|---|---|---|---|---|
| C3 | ||||||
| Mean ± SD | 5.1 ± 0.7 | 7.8 ± 1.0 | 1.9 ± 0.5 | 3.1 ± 0.5 | 46.0 ± 4.2 | 20.9 ± 7.6 |
| Range | 3.7–6.1 | 5.7–8.9 | 1.2–2.8 | 2.0–3.8 | 37.0–52.0 | 10.0–40.0 |
| C4 | ||||||
| Mean ± SD | 5.8 ± 0.6 | 7.8 ± 0.8 | 2.4 ± 0.4 | 3.4 ± 0.6 | 48.8 ± 4.5 | 10.5 ± 8.9 |
| Range | 4.8–6.8 | 6.6–9.3 | 1.9–3.5 | 2.2–4.3 | 40.0–56.0 | −6.0 to 26.0 |
| C5 | ||||||
| Mean ± SD | 5.7 ± 1.3 | 7.1 ± 1.0 | 2.9 ± 1.1 | 3.1 ± 0.4 | 48.1 ± 6.6 | −3.6 ± 6.6 |
| Range | 2.3–7.0 | 5.6–8.6 | 1.5–5.8 | 2.6–3.6 | 36.0–57.0 | −14.0 to 7.0 |
| C6 | ||||||
| Mean ± SD | 6.0 ± 0.9 | 6.7 ± 1.1 | 2.4 ± 0.5 | 2.7 ± 0.5 | 41.0 ± 3.7 | −12.2 ± 7.4 |
| Range | 4.6–7.2 | 4.4–8.3 | 1.9–3.2 | 1.9–3.5 | 35.0–46.0 | −23.0 to −2.0 |
| C7 | ||||||
| Mean ± SD | 7.1 ± 0.4 | 7.7 ± 1.5 | 3.3 ± 0.6 | 3.6 ± 0.7 | 40.3 ± 2.7 | −3.5 ± 12.4 |
| Range | 6.7–8.0 | 5.8–11.1 | 2.0–4.6 | 2.5–4.8 | 36.0–45.0 | −16.0 to 22.0 |