Table 1.
Improvement in femoral head roundness parameters after VFO
| Plane | Roundness component | Before VFO (mm) (range) | Latest followup (mm) (range) | p* |
|---|---|---|---|---|
| AP (n = 25) | LHR | 48.0 (30–72) | 36.5 (27–47) | 0.001 |
| MHR | 28.3 (21–35) | 27.3 (22–33) | 0.105 | |
| CHH | 24.4 (17–29) | 26.0 (18––35) | 0.037 | |
| MHR/LHR | 0.65 (0.32–1.10) | 0.81 (0.49–0.97) | 0.003 | |
| Lateral (n = 14) | AHR | 36.6 (25–56) | 32.9 (22–50) | 0.001 |
| PHR | 20.6 (15–30) | 19.6 (14–26) | 0.137 | |
| CHH | 19.1 (15–26) | 19.9 (16–25) | 0.059 | |
| PHR/AHR | 0.61 (0.43–0.85) | 0.75 (0.43–0.85) | 0.019 |
LHR = lateral head roundness; MRH = medial head roundness; CHH = central head height; AHR = anterior head roundness; PHR = posterior head roundness; * Wilcoxon signed-rank test.