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Table 1 Knee error

From: Validation of the angular measurements of a new inertial-measurement-unit based rehabilitation system: comparison with state-of-the-art gait analysis

Exercise: Knee flexion
  Target ROM Mean distance MIN mean dist. MAX mean dist.
Knee flexion 0 - 95 3.9 ± 0.7 2.2 6.1
Knee extension 0 - 90 3.8 ± 0.8 1.8 5.9
Lunge 0 - 100 4.5 ± 1.3 2.0 7.9
Squat 0 - 100 5.0 ± 1.2 2.4 8.3
  1. Differences between IMU and GA for knee flexion angles [deg] over the 17 subjects analyzed.