Table 1.
3-D vs 2-D.
| 1 | 3-D Templating | 2-D Templating | P-value | ||
|---|---|---|---|---|---|
| **Acetabular Component Accuracy** | |||||
| Accurate to exact size | 289/290 | 99.7% | 114/290 | 39.3% | <0.001 |
| Total templated smaller | 133/290 | 45.8% | 0/290 | 0.0% | <0.001 |
| Total templated larger | 0/290 | 0.0% | 43/290 | 14.8% | <0.001 |
| Most common size deviation | |||||
| 2 mm smaller | 99/290 | 34.1% | 0/290 | 0.0% | <0.001 |
| 4 mm smaller | 29/290 | 10.0% | 0/290 | 0.0% | <0.001 |
| 6 mm smaller | 3/290 | 1.0% | 0/290 | 0.0% | 0.088 |
| 8 mm smaller | 1/290 | 0.3% | 0/290 | 0.0% | 1.000 |
| 10 mm smaller | 1/290 | 0.3% | 0/290 | 0.0% | 1.000 |
| 2 mm larger | 0/290 | 0.0% | 36/290 | 12.4% | <0.001 |
| 4 mm larger | 0/290 | 0.0% | 4/290 | 1.4% | 0.043 |
| 6 mm larger | 0/290 | 0.0% | 3/290 | 1.0% | 0.088 |
| **Femoral Component Accuracy** | |||||
| Accurate to exact size | 161/255 | 63.1% | 135/255 | 52.9% | 0.015 |
| Within one size of final implant | 246/255 | 96.5% | 241/255 | 94.5% | 0.562 |
| Stem 1 size smaller | 48/255 | 18.8% | 69/255 | 27.1% | 0.022 |
| Stem 1 size larger | 37/255 | 14.5% | 37/255 | 14.5% | 1.000 |
| Stem 2 sizes smaller | 8/255 | 3.1% | 8/255 | 3.1% | 1.000 |
| Stem 3 sizes smaller | 1/255 | 0.4% | 1/255 | 0.4% | 1.000 |
| Stem 5 sizes smaller | 0/255 | 0.0% | 1/255 | 0.4% | 0.281 |
| Stem 2 sizes larger | 0/255 | 0.0% | 3/255 | 1.2% | 0.062 |
| Stem 3 sizes larger | 0/255 | 0.0% | 1/255 | 0.4% | 0.281 |
| **Lateral Femoral Offset Accuracy** | |||||
| Matched the plan | 290/290 | 100.0% | 222/255 | 87.0% | <0.001 |
| Changed after 3D templating | 0/290 | 0.0% | 33/255 | 13.0% | <0.001 |
| Switched from 132-degree to 127-degree offset | 0/290 | 0.0% | 31/255 | 12.0% | <0.001 |
| Changed from 127-degree to 132-degree offset stem | 0/290 | 0.0% | 2/255 | 1.0% | 0.088 |