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Fig. 6 The two renderings show the complete plan after all the individual vertebrae have been
templated
Pre-op to Post-op
2D Pre-op to 3D Pre-op
25
60
20
50
40
15
30
10
20
5
10
0
0
2D Deviations 3D Deviations
Pre-op Planning Method
2D < 3D 3D < 2D
Pre-op Planning Methods
Resident
Staff
Resident
Staff
Fig. 7 The chart on the left shows the screw length deviations between the two different pre-
operative planning methods and the post-operative results for the resident and staff surgeon. The
chart on the right shows for each type of surgeon, the number of times the screw dimensions from
one pre-operative planning method was smaller than those from the other pre-operative method
accounting for larger template sizes. The expert
s templates were just the opposite,
illustrated by the same chart. He tended to choose shorter narrower screws in the 3D
plan compared to the same subjects in the 2D plan. Based on better views from the
3D plan, he may recognize preferred locations for the templates that would provide
adequate holding strength while maximizing safety and avoiding problem areas not
observed using 2D planning methods.
'
