Table 1.
Deviations between the knee flexion/extension and ankle plantar/dorsiflexion angle measurements of the optical and the inertial system for six gait trials of a transfemoral amputee. Results are given for αacc+gyr only, since both methods yield very similar results. The deviations vary little (σ ≈ 1°). For the knee angles, the same difference in the accuracies of the prosthesis and human leg is observed as in Figure 8.
| Trials | RMSE | ||||||||
|---|---|---|---|---|---|---|---|---|---|
| 1 | 2 | 3 | 4 | 5 | 6 | σ | Average | ||
| knee | prosthesis | 0.46° | 0.89° | 0.59° | 0.95° | 0.57° | 0.77° | 0.19° | 0.71° |
| contralateral | 3.25° | 2.76° | 3.10° | 3.16° | 0.40° | 3.83° | 1.20° | 3.30° | |
| ankle | prosthesis | 0.92° | 1.03° | 0.91° | 0.65° | 0.67° | 0.69° | 0.16° | 0.81° |
| contralateral | 0.95° | 1.50° | 1.25° | 1.53° | 1.85° | 2.61° | 0.57° | 1.62° | |