Table 4.
Prelearning and postlearning curve handheld navigation outcomes compared to conventional fluoroscopic THA.
| Variable | Conventional fluoroscopy (n = 60) | Prelearning curve (n = 30) | P valuea | Postlearning curve (n = 64) | P valuea |
|---|---|---|---|---|---|
| Acetabular cup version | |||||
| Mean difference in degrees | 5.8 (4.6) | 5.8 (4.1) | 1.000 | 2.0 (1.4) | <.001b |
| Outlier ≥5° | 29 (48%) | 17 (57%) | .454 | 4 (6%) | <.001b |
| Outlier ≥10° | 12 (20%) | 5 (17%) | .699 | 0 (0%) | <.001b |
| Acetabular cup inclination | |||||
| Mean difference in degrees | 5.4 (4.1) | 2.9 (1.9) | .011 | 1.3 (1.0) | <.001b |
| Outlier ≥5° | 25 (42%) | 7 (23%) | .087 | 0 (0%) | <.001b |
| Outlier ≥10° | 9 (15%) | 0 (0%) | .027 | 0 (0%) | .001b |
| Leg length discrepancy | |||||
| Mean difference in mm | 3.4 (3.0) | 2.3 (1.8) | .087 | 1.0 (1.1) | <.001b |
| Outlier ≥5 mm | 18 (30%) | 3 (10%) | .034 | 1 (2%) | <.001b |
| Outlier ≥10 mm | 3 (5%) | 0 (0%) | .326 | 0 (0%) | .11 |
| Operative time (min) | 72 (24) | 92 (15) | <.001 | 66 (10) | .113 |
| Fluoroscopic dose (mGy) | 2.08 (2.10) | 1.64 (0.94) | .280 | 0.56 (0.48) | <.001b |
| Fluoroscopic time (s) | 19.1 (8.4) | 20.4 (7.5) | .477 | 5.3 (3.3) | <.001b |
Categorical data presented as n (%); continuous data presented as mean (standard deviation).
a
Compared to conventional fluoroscopy.
b
Statistically significant P value.