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Table 5 Accuracy error E r (mean ± STD) in mm for each subject and each algorithm between estimated radius and the actual one measured by MRI

From: In vivo estimation of the shoulder joint center of rotation using magneto-inertial sensors: MRI-based accuracy and repeatability assessment

Algorithm

Subject 1

Subject 2

Subject 3

Subject 4

Subject 5

Mean

\({\text{NAP}}^{\left( 1 \right)}\)

9.2 ± 6

12.9 ± 9

7.7 ± 3

4.3 ± 3

10.0 ± 6

8.81 ± 6

\({\text{NAP}}_{\upomega }^{\left( 1 \right)}\)

8.6 ± 6

12.6 ± 9

8.0 ± 3

4.1 ± 2

10.2 ± 6

8.7 ± 6

\({\text{NAP}}_{{\upomega{\text{a}}}}^{\left( 2 \right)}\)

8.5 ± 8

15.0 ± 10

8.0 ± 6

7.5 ± 5

10.8 ± 9

10.0 ± 8

\({\text{SSFC}}^{\left( 2 \right)}\)

13.9 ± 10*

23.2 ± 15*

17.9 ± 10*

15.6 ± 8*

14.6 ± 11*

17.1 ± 11

\({\text{SAC}}^{\left( 2 \right)}\)

8.1 ± 5

12.7 ± 15

6.1 ± 4

6.6 ± 4

5.8 ± 5

7.9 ± 8

  1. * A statistically significant difference between that specific algorithm (on that subject) and all the other algorithms, with p < 0.005 (Student’s t test with Bonferroni’s correction)