Table 2.
Measurements of proximal femoral anatomy, absolute differences, and percent asymmetry per gender
| Measurement | Gender | Diameter* (mm) | 95% CI | Absolute difference*,† (mm) | 95% CI | Percent asymmetry‡ | 95% CI |
|---|---|---|---|---|---|---|---|
| AP measurements | |||||||
| Femoral head | Male | 55.8 ± 4.3 | (54.8, 56.7) | 0.8 ± 0.7 | (0.5, 1.1) | 1.5 ± 1.4 | (1.2, 1.8) |
| Female | 48.3 ± 3.1 | (47.6, 49.0) | 0.9 ± 0.7 | (0.6, 1.1) | 1.8 ± 1.4 | (1.5, 2.1) | |
| Femoral neck | Male | 39.3 ± 4.1 | (38.4, 40.3) | 1.1 ± 0.7 | (0.8, 1.4) | 2.9 ± 1.9 | (2.5, 3.3) |
| Female | 33.7 ± 2.7 | (33.1, 34.3) | 1.0 ± 0.8 | (0.7, 1.4) | 3.1 ± 2.4 | (2.6, 3.6) | |
| Femoral shaft | Male | 37.0 ± 3.8 | (36.1, 37.8) | 1.1 ± 0.8 | (0.7, 1.4) | 2.9 ± 2.2 | (2.4, 3.4) |
| Female | 33.3 ± 3.2 | (32.6, 34.0) | 0.9 ± 0.7 | (0.6, 1.2) | 2.7 ± 2.0 | (2.3, 3.2) | |
| Cephalocaudal measurements | |||||||
| Femoral head | Male | 40.6 ± 3.2 | (39.9, 41.3) | 0.6 ± 0.6 | (0.3, 0.8) | 1.4 ± 1.4 | (1.1, 1.7) |
| Female | 35.2 ± 2.3 | (34.7, 35.7) | 0.5 ± 0.4 | (0.3, 0.7) | 1.4 ± 1.2 | (1.1, 1.6) | |
| Femoral neck | Male | 23.9 ± 2.5 | (23.9, 24.5) | 0.8 ± 0.6 | (0.5, 1.0) | 3.2 ± 2.4 | (2.6, 3.7) |
| Female | 20.1 ± 1.9 | (19.6, 20.5) | 0.7 ± 0.6 | (0.4, 0.9) | 3.5 ± 2.9 | (2.8, 4.1) | |
* The data are given as mean ± SD; †absolute difference = difference between maximum and minimum of left and right; ‡percent asymmetry = (maximum − minimum)/(average of maximum and minimum) × 100.