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Table 2 Accuracy of knee kinematics determined by the Opti_Knee gait system and biplanar fluoroscopy system in gait 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 (°) 2.3 − 0.7 2.2 (− 5.2, 3.8) 0.979 0.958
Int/Ext rotation (°) 3.2 0.6 3.1 (− 5.5, 6.7) 0.964 0.929
Flexion/extension (°) 1.4 − 0.1 1.4 (− 2.8, 2.6) 0.999 0.998
Ant/Pos translation (mm) 4.2 − 0.1 4.2 (− 8.3, 8.1) 0.938 0.880
Dis/Pro translation (mm) 3.3 − 1.6 2.8 (− 7.1, 3.9) 0.883 0.780
Med/Lat translation (mm) 3.2 − 2.3 2.3 (− 6.8, 2.2) 0.912 0.832
  1. Notes: RMSE root mean square error, SD standard deviation, Add/Abd abduction/adduction, Int/Ext internal/external, Flex/Ext flexion/extension, Ant/Pos anterior/posterior, Dis/Pos distal/proximal, Med/Lat medial/lateral