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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