| Visual estimation (Mean ± SDa) | Goniometry (Mean ± SD) | Digital photography (Mean ± SD) |
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Knee Flexion | 5.2° ±3.9 | 4.3° ±3.1 | 5.2° ±3.4 |
Knee Extension | 5.2° ±2.6 | 4.7° ±2.5 | 3.5° ±2.3 |
- 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 both knee motions
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a
SD standard deviation