Article Figures & Data
Figures
- Fig. 1
(A) Axial angle on the O-Arm images. The arrow represents the midsagittal plane of L4, which is defined as 0°. The planned screw makes a 13.1° angle with the midsagittal plane of L4. (B) Axial angle on the postoperative images. The actual screw made 11.2° angle with the midsagittal plane of L4. (Color version of figure is available online.)
- Fig. 2
(A) Sagittal angle on the O-Arm images. The arrow is the superior end plate of L4 defined as 0°. The planned screw makes a 10.1° angle with the end plate of L4. (B) Sagittal angle on the postoperative images. The actual screw makes a 10.7° angle with the end plate of L4. (Color version of figure is available online.)
- Fig. 3
Shows an example of anterolateral perforation. The adjacent image shows the planned L5 trajectory almost parallel to the midline sagittal vertebral axis. The triangle-shaped L5 body and proximity of the planned screw to the cortical margin can be noted. (Color version of figure is available online.)
Tables
- Table
The planned angle and the postoperative angle for each level in axial and sagittal planes. The mean navigational error in both planes is shown in column 4 and column 7. Standard deviation in parentheses
Level Axial Sagittal Planned angle Postop angle Navigational error Planned angle Postop angle Navigational error RL4 10.4° (±2.8) 10.5° (±2.8) 1.8° (±1.5) 11.4° (±3.2) 11.1° (±2.7) 2.1° (±1.6) LL4 9.9° (±3.9) 10.3° (±3.2) 2.3° (±1.7) 9.4° (±3.1) 10.7° (±3.9) 3.6° (±2.5) L4 10.2° (±3.4) 10.4°(±2.9) 2.1° (±1.6) 10.3° (±3.3) 10.9° (±3.3) 2.8° (±2.1) RL5 8.4° (±3.1) 8.0° (±3.4) 3.4° (±1.8) 2.6° (±3.6) 2.1° (±5.5) 3.6° (±2.9) LL5 7.2° (±3.5) 7.4° (±2.7) 2.2° (±1.8) 0.8° (±4.1) 0.8° (±5.4) 2.9° (±2.4) L5 7.8°(±3.3) 7.7° (±3.1) 2.7° (±1.9) 1.6° (±3.9) 0.6° (±5.6) 3.2° (±2.6)
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