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Cup positioning results for freehand and C-arm techniques (all cases)
| Criteria | Freehand (n = 52) | C-arm (n = 57) | p value |
|---|---|---|---|
| Abduction, degrees | |||
| < 30 | 3 (6%) | 4 (7%) | |
| 30–45 (optimal) | 30 (58%) | 42 (74%) | |
| > 45 | 19 (36%) | 11 (19%) | |
| Version, degrees | |||
| < 5 | 3 (6%) | 4 (7%) | |
| 5–25 (optimal) | 39 (75%) | 49 (86%) | |
| > 25 | 10 (19%) | 4 (7%) | |
| Both optimal | 23 (44%) | 37 (65%) | 0.03* |
* Statistically significant, Z-test for comparing two independent binary proportions.
