Table 1 Accuracy of the knee kinematics determined by the Opti_Knee gait system and biplanar fluoroscopy system in flexion–extension cycles
From: Validation of a portable marker-based motion analysis system
Variables | RMSE | Mean differences | SD of differences | 95% limits of agreement | R | R square |
|---|---|---|---|---|---|---|
Add/Abd (°) | 1.9 | − 0.1 | 2.2 | (− 4.4, 4.2) | 0.995 | 0.990 |
Int/Ext rotation (°) | 3.8 | − 3.8 | 2.0 | (− 7.7,0.1) | 0.998 | 0.996 |
Flexion/extension (°) | 1.7 | − 0.9 | 1.7 | (− 4.2, 2.4) | 0.999 | 0.998 |
Ant/Pos translation (mm) | 3.3 | 0.9 | 3.7 | (− 6.2, 8.4) | 0.858 | 0.736 |
Dis/Pro translation (mm) | 3.7 | 0.8 | 3.9 | (− 7.6, 8.4) | 0.994 | 0.988 |
Med/Lat translation (mm) | 2.7 | 0 | 3.1 | (− 6.1, 6.1) | 0.911 | 0.830 |