Table 3.
Handheld navigation and conventional component position, operative time, and fluoroscopy use.
| Variable | Direct anterior approach |
P value | |
|---|---|---|---|
| Handheld navigation (n = 99) | Conventional fluoroscopy (n = 60) | ||
| Acetabular cup version | |||
| Mean difference in degrees | 3.2 (3.1) | 5.8 (4.6) | <.001b |
| Outlier ≥5° | 24 (24%) | 29 (48%) | .002b |
| Outlier ≥10° | 5 (5%) | 12 (20%) | .003b |
| Acetabular cup inclination | |||
| Mean difference in degrees | 1.8 (1.6) | 5.4 (4.1) | <.001b |
| Outlier ≥5° | 8 (8%) | 25 (42%) | <.001b |
| Outlier ≥10° | 0 (0%) | 9 (15%) | <.001b |
| Leg length discrepancy | |||
| Mean difference in mm | 1.6 (1.7) | 3.4 (3.0) | <.001b |
| Outlier ≥5 mm | 5 (5%) | 18 (30%) | <.001b |
| Outlier ≥10 mm | 0 (0%) | 3 (5%) | .052 |
| Offset discrepancya | |||
| Mean difference in mm | 1.4 (1.7) | 6.1 (4.5) | <.001b |
| Outlier ≥5 mm | 3 (7%) | 14 (61%) | <.001b |
| Outlier ≥10 mm | 0 (0%) | 3 (13%) | .032b |
| Operative time (min) | 75 (17) | 72 (24) | .305 |
| Fluoroscopic dose (mGy) | 1.01 (0.89) | 2.08 (2.10) | <.001b |
| Fluoroscopic time (s) | 11.2 (8.8) | 19.1 (8.4) | <.001b |
Categorical data presented as n (%); continuous data presented as mean (standard deviation).
a
Intraoperative offset measurement available in 47 navigation cases.
b
Statistically significant P value.