A pelvic kinematic approach for calculating hip angles for active hip disarticulation prosthesis control

Table 6 Testing group average per-feature differences and standard deviations for all participants, average correlation between calculated and measured features, and average root-mean-squared-error between calculated and measured hip trajectories

PNO	Hθ_FS	Hθ_E	Hτ_E	Hθ_F	Hτ_F	Corr	RMSE
1	2.2 ± 1.7	3.1 ± 2.2	0.1 ± 0.0	2.4 ± 1.6	0.1 ± 0.0	0.97 ± 0.01	3.94 ± 0.93
2	2.3 ± 1.4	2.8 ± 1.8	0.0 ± 0.0	2.2 ± 1.5	0.0 ± 0.1	0.96 ± 0.01	3.71 ± 0.82
3	2.2 ± 1.4	2.3 ± 1.5	0.0 ± 0.0	2.0 ± 1.1	0.2 ± 0.0	0.95 ± 0.01	5.23 ± 0.65
4	1.7 ± 1.3	3.1 ± 2.3	0.1 ± 0.0	1.9 ± 1.1	0.0 ± 0.0	0.97 ± 0.01	4.21 ± 0.95
5	1.8 ± 1.4	3.5 ± 2.4	0.1 ± 0.0	1.5 ± 1.1	0.2 ± 0.1	0.97 ± 0.02	4.52 ± 2.43
6	2.3 ± 1.7	2.9 ± 1.8	0.0 ± 0.0	2.5 ± 2.0	0.0 ± 0.1	0.94 ± 0.03	5.46 ± 1.68
7	2.8 ± 1.8	4.5 ± 4.3	0.1 ± 0.1	1.8 ± 1.4	0.3 ± 0.4	0.90 ± 0.09	7.33 ± 4.35
8	1.4 ± 1.3	2.8 ± 1.8	0.0 ± 0.0	1.4 ± 1.3	0.0 ± 0.0	0.95 ± 0.02	4.80 ± 0.99
9	1.6 ± 1.0	3.4 ± 2.6	0.0 ± 0.0	1.5 ± 1.1	0.1 ± 0.0	0.92 ± 0.02	5.89 ± 0.66
10	2.1 ± 2.1	3.1 ± 3.9	0.1 ± 0.0	2.0 ± 1.3	0.1 ± 0.0	0.98 ± 0.01	4.63 ± 0.88
Mean	2.0 ± 1.6	3.4 ± 2.8	0.1 ± 0.1	1.9 ± 1.4	0.1 ± 0.2	0.95 ± 0.04	5.01 ± 2.01
Correlation	0.88	0.79	0.95	0.91	0.91	–	–

Corr shows the average correlation for each person across features
PNO.: Participant number; Hθ_FS: Hip angle at foot-strike (°); Hθ_E: Hip max extension angle (°); Hτ_E: Hip max extension time (s), Hθ_F: Hip max flexion angle (°); Hτ_F: Hip max flexion time (s); RMSE: Root-mean-square-error of the calculated hip rotation trajectory relative to the measured hip rotation trajectory

ISSN: 1743-0003