Precision of O-arm assisted spinal navigation.
| Level | No. of screws | Axial | Sagittal | ||||||
|---|---|---|---|---|---|---|---|---|---|
| Mean virtual angle (°) | Mean actual angle (°) | Mean angle difference (°) | Axial Percent error | Mean virtual angle (°) | Mean actual angle (°) | Mean angle difference (°) | Sagittal Percent error | ||
| T1 | 9 | 22.4 | 21.2 | 2.56 | 1.25% | 4.56 | 1.78 | 3.00 | 1.59% |
| T2 | 11 | 17.8 | 17.3 | 2.73 | 1.38% | 4.00 | 4.45 | 2.82 | 1.52% |
| T3 | 11 | 15.5 | 14.8 | 3.27 | 1.66% | 2.45 | 2.18 | 2.09 | 1.14% |
| T4 | 8 | 18.1 | 15.8 | 3.13 | 1.57% | 4.38 | 2.63 | 2.00 | 1.08% |
| T5 | 15 | 16.1 | 15.1 | 2.53 | 1.30% | 3.47 | 2.47 | 1.93 | 1.04% |
| T6 | 12 | 13.8 | 12.1 | 2.00 | 1.03% | 3.25 | 3.25 | 1.00 | 0.55% |
| T7 | 12 | 12.8 | 12.3 | 2.00 | 1.04% | 4.17 | 3.33 | 1.83 | 0.99% |
| T8 | 14 | 13.9 | 13.5 | 1.71 | 0.88% | 4.00 | 4.79 | 1.79 | 0.97% |
| T9 | 15 | 13.1 | 13.3 | 1.40 | 0.73% | 3.20 | 4.20 | 1.67 | 0.91% |
| T10 | 13 | 11.1 | 10.1 | 1.77 | 0.93% | 1.69 | 0.77 | 1.69 | 0.92% |
| T11 | 16 | 9.9 | 9.4 | 1.94 | 1.02% | 5.69 | 5.38 | 1.69 | 0.91% |
| T12 | 10 | 8.7 | 9.0 | 1.30 | 0.69% | 2.44 | 2.33 | 1.44 | 0.75% |
| L1 | 11 | 15.1 | 14.4 | 1.64 | 0.84% | 3.91 | 4.18 | 1.91 | 1.03% |
| L2 | 14 | 20.7 | 19.1 | 2.57 | 1.25% | 3.71 | 3.64 | 2.50 | 1.35% |
| L3 | 12 | 18.8 | 18.7 | 2.00 | 1.00% | 4.58 | 3.67 | 1.75 | 0.95% |
| L4 | 18 | 16.9 | 16.8 | 2.67 | 1.33% | 3.86 | 4.14 | 2.19 | 1.22% |
| L5 | 22 | 14.6 | 14.8 | 2.55 | 1.29% | 3.05 | 4.32 | 2.45 | 1.34% |
| S1 | 17 | 11.2 | 10.7 | 1.59 | 0.83% | 3.94 | 3.24 | 4.35 | 2.32% |
| Total | 240 | 14.8 | 14.2 | 2.17 | 1.11 | 3.67 | 3.49 | 2.16 | 1.17% |
| P value 0.0016 | P value = 0.19 | ||||||||