Table 2 The interobserver repeatability, intraobserver repeatability, and AI validation results for the EDEMA scan ROI and for the HTEN scan tendon rois for the examined metrics (volume, length, max CSA, and surface area). The HTEN scan results are for the whole tendon, the results for the free tendon and aponeurosis regions are in Supplemental Material. Average difference, average coefficient of variation (%), correlation coefficient (R), and Bland-Altman assessment for proportional bias are reported. Significance levels of the measures reported are denoted using: *p < 0.05, **p < 0.01, †p < 0.001.

ROI: Edema (EDEMA)

Total Volume (ml)

17.37 ± 17.75

55.2

0.97^†

−4.04^†

11.27 ± 25.08

17.65

0.92^**

1.28

4.81 ± 6.97

13.52

0.98^**

1.3

Edema Length (cm)

5.89 ± 6.19

46.71

0.79^†

−4.37^†

1.45 ± 2.12

8.82

0.95^**

0.21

1.27 ± 2.09

7.98

0.95^**

−2.27^*

Max CSA (cm²)

2.14 ± 2.12

50.98

0.92^†

−3.31^†

1.11 ± 1.68

16.05

0.92^**

−0.41

0.78 ± 1.23

10.29

0.95^**

1

ROI: Biceps Femoris Semitendinosus Joint Tendon (HTEN)

Volume (mL)

−3.52 ± 4.74

21.51

0.42^**

−5.55^†

−0.1 ± 0.69

3.99

0.91^**

−0.38

0.08 ± 0.15

1.29

1.0^†

0.908

Length (cm)

−1.81 ± 3.5

5.16

0.51^†

−3.88^†

−0.06 ± 0.63

1.03

0.29

−0.26

−1.0 ± 1.27

2.9

−0.65

−1.36

Max CSA (cm²)

−0.28 ± 0.41

24.87

0.49^†

−5.07^†

0.04 ± 0.08

9.36

0.69

1.33

0.0 ± 0.04

5.2

0.92

0.09

Surface Area (cm²)

−13.85 ± 15.66

15.8

0.63^†

−6.62^†

−6.16 ± 8.56

9.85

0.6

−1.9

1.54 ± 1.54

2.45

0.99^**

1.73

ROI: Semimembranosus Proximal Tendon (HTEN)

Volume (mL)

−2.3 ± 2.18

8.18

0.90^†

−7.91^†

0.1 ± 0.86

2.7

0.72^*

0.32

−0.09 ± 0.13

0.54

1.0^**

−1.19

Length (cm)

−1.46 ± 0.77

2.77

0.98^†

−14.16^†

0.25 ± 0.35

0.5

0.93^**

1.87

−1.0 ± 0.35

1.97

0.97^*

−4.9^*

Max CSA (cm²)

−0.11 ± 0.15

9.24

0.76^†

−5.38^†

0.06 ± 0.09

5.9

0.42

1.85

0.01 ± 0.08

5.58

0.91

0.18

Surface Area (cm²)

−17.2 ± 13.42

7.32

0.93^†

−9.59^†

−0.75 ± 2.65

0.96

0.97^†

−0.75

1.62 ± 2.62

0.81

0.96^*

1.07

ROI: Semimembranosus Distal Tendon (HTEN)

Volume (mL)

−0.94 ± 2.57

6.01

0.89^†

−2.73^**

0.8 ± 1.4

5.11

−0.59

1.51

−0.09 ± 0.17

0.6

0.98^*

−0.9

Length (cm)

−0.96 ± 0.8

2.73

0.93^†

−9.94^†

0.19 ± 0.66

1.77

0.76

0.75

0.13 ± 0.22

0.37

0.99^*

1

Max CSA (cm²)

−0.07 ± 0.19

6.35

0.83^†

−2.92^**

0.06 ± 0.09

4.17

0.95^†

1.83

−0.05 ± 0.06

2.73

0.96^*

−1.34

Surface Area (cm² )

−4.93 ± 15.71

5.54

0.85^†

−2.35^*

3.24 ± 5.93

2.97

0.86^**

1.45

1.6 ± 1.33

0.96

0.99^**

2.1

ROI: Semitendinosus Distal Tendon (HTEN)

Volume (mL)

−0.91 ± 0.89

8.54

0.91^†

−7.73^†

0.17 ± 0.42

3.24

0.74^*

1.08

−0.18 ± 0.13

1.67

1.0^**

−2.37

Length (cm)

−1.67 ± 1.74

4.9

0.86^†

−7.20^†

0.69 ± 0.5

1.87

0.96^†

3.67^**

−1.25 ± 0.56

3.11

1.0^**

−3.87^*

Max CSA (cm ² )

−0.07 ± 0.1

11.2

0.83^†

−5.11^†

−0.02 ± 0.06

5.09

0.9^**

−0.94

0.06 ± 0.03

7.29

0.99^**

3.67^*

Surface Area (cm ² )

−7.16 ± 6.14

8.17

0.95^†

−8.73^†

1.83 ± 3.2

3.34

0.44

1.51

−1.53 ± 0.58

1.72

0.97^*

−4.59^*

ROI: Biceps Femoris Distal Tendon (HTEN)

Volume (mL)

−1.41 ± 1.15

6.01

0.94^†

−9.13^†

0.2 ± 0.48

1.89

0.92^**

1.11

−0.12 ± 0.05

0.49

1.0^**

−4.37^*

Length (cm)

−0.29 ± 0.68

1.27

0.92^†

−3.14^**

0.38 ± 1.24

2.72

0.86^**

0.8

−0.5 ± 0.35

1.2

0.98^*

−2.45

Max CSA (cm ² )

−0.04 ± 0.26

9.64

0.83^†

−1.08

−0.01 ± 0.07

3.45

0.92^**

−0.36

0.06 ± 0.07

4.5

0.88

1.71

Surface Area (cm ² )

“−13.81 ± 9.97”

8.09

0.92^†

−10.36^†

0.01 ± 2.86

1.34

0.8^*

0.01

0.85 ± 1.92

1.31

1.0^**

0.77