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Table 1 Virtual prosthesis performance metrics

From: Non-weight-bearing neural control of a powered transfemoral prosthesis

 

Knee F/E and ankle DF/PF

Knee F/E, femoral rotation, ankle DF/PF and ankle rotation

Performance metric

Amputee

Control

Amputee

Control

  

(n = 6)

(n = 6)

(n = 6)

(n = 6)

Classification accuracy, %

Overall

 

90.7 (6.4)

91.2 (5.5)

88.0 (3.9)

90.8 (4.7)

Hip/Knee

 

88.5 (10.9)

98.8 (2.0)

86.3 (9.3)

96.8 (2.7)

Ankle

 

88.1 (10.2)

81.4 (18.5)

86.3 (5.8)

87.2 (7.9)

Motion selection time, s

Overall

 

0.36 (0.17)

0.38 (0.21)

0.70 (0.41)

0.58 (0.32)

Hip/Knee

 

0.46 (0.28)

0.33 (0.15)

0.51 (0.35)

0.57 (0.34)

Ankle

 

0.25 (0.14)

0.47 (0.53)

0.88 (0.85)

0.58 (0.46)

Motion completion time, s

Overall

 

2.06 (0.56)

1.74 (0.52)

2.62 (0.67)

1.95 (0.55)

Hip/Knee

 

2.00 (0.85)

1.30 (0.14)

2.27 (0.63)

1.54 (0.34)

Ankle

 

2.14 (0.57)

2.23 (1.06)

3.00 (0.87)

2.40 (0.88)

Motion completion percentage, %

Overall

 

97.7 (3.2)

96.3 (7.8)

90.3 (6.8)

96.5 (5.5)

Hip/Knee

 

100.0 (0)

100.0 (0)

95.8 (7.0)

100.0 (0)

Ankle

 

95.4 (6.5)

92.6 (15.6)

84.7 (11.1)

93.1 (11.1)

  1. F/E = flexion/extension, DF/PF = dorsi-flexion/plantar flexion.
  2. All results are presented in mean (standard deviation).