| Visual estimation (Mean ± SDa) | Goniometry (Mean ± SD) | Digital photography (Mean ± SD) |
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Hip Flexion | 3.9° ±3.4 | 3.1° ±2.5 | 3.5° ±2.7 |
Hip Abduction | 6.2° ±4.1 | 5.8° ±3.7 | 4.8° ±3.8 |
Hip Internal Rotation | 7.3° ±5.7 | 6.8° ±5.1 | 5.9° ±4.8 |
Hip External Rotation | 10.1° ±6.7 | 9.7° ±6.0 | 8.6° ±5.1 |
- Accuracy of measurements (measurement error, in degrees) calculated as the absolute value of the difference between the measurement taken by the investigator using each technique (visual estimation, goniometry, digital photography) and the reference standard (motion capture analysis) for all four hip motions
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a
SD standard deviation