Outcome measures (QUS Measurements) | ||||||||||
---|---|---|---|---|---|---|---|---|---|---|
All tendons n = 86 | Symptomatic n = 23 | Asymptomatic n = 63 | Difference between groups (%) | |||||||
Average | Stand. Dev. | 95 % CIa | Average | Stand. Dev. | 95 % CIa | Average | Stand. Dev. | 95 % CIa | ||
Longitudinal view | ||||||||||
Geometric | ||||||||||
Thickness (cm) | 0.56 | 0.16 | 0.53–0.59 | 0.68 | 0.21 | 0.60–0.76 | 0.52 | 0.10 | 0.49–0.54 | 31.88 |
Grayscale histogram | ||||||||||
Echogenicity (0–255) | 82.37 | 14.44 | 79.31–85.42 | 79.32 | 14.22 | 73.51–85.13 | 83.48 | 13.32 | 80.19–86.77 | −4.98 |
Variance | 618.72 | 216.98 | 572.86–664.58 | 654.93 | 213.52 | 567.66–742.19 | 605.50 | 160.62 | 565.83–645.16 | 8.16 |
Skewness | 0.52 | 0.34 | 0.45–0.59 | 0.65 | 0.25 | 0.55–0.75 | 0.47 | 0.21 | 0.42–0.53 | 38.13 |
Kurtosis | 3.82 | 1.28 | 3.54–4.09 | 4.18 | 1.02 | 3.76–4.59 | 3.68 | 0.64 | 3.52–3.84 | 13.41 |
Entropy | 6.50 | 0.24 | 6.45–6.55 | 6.51 | 0.24 | 6.41–6.61 | 6.50 | 0.19 | 6.46–6.55 | 0.10 |
Co –occurrence matrix | ||||||||||
Contrast | 0.64 | 0.13 | 0.61–0.67 | 0.61 | 0.11 | 0.57–0.66 | 0.65 | 0.11 | 0.62–0.68 | −5.67 |
Energy | 0.21 | 0.05 | 0.20–0.22 | 0.21 | 0.04 | 0.19–0.22 | 0.21 | 0.04 | 0.20–0.22 | −2.76 |
Homogeneity | 0.76 | 0.03 | 0.76–0.77 | 0.77 | 0.02 | 0.76–0.77 | 0.76 | 0.02 | 0.75–0.77 | 0.82 |
Transverse view | ||||||||||
Geometric | ||||||||||
Area (CSA) (cm2) | 0.61 | 0.23 | 0.56–0.66 | 0.76 | 0.33 | 0.63–0.90 | 0.56 | 0.14 | 0.52–0.59 | 36.61 |
Thickness (cm) | 0.57 | 0.15 | 0.54–0.60 | 0.67 | 0.20 | 0.59–0.75 | 0.53 | 0.09 | 0.51–0.55 | 26.73 |
Width (cm) | 1.32 | 0.16 | 1.28–1.35 | 1.37 | 0.19 | 1.29–1.44 | 1.30 | 0.13 | 1.27–1.33 | 5.30 |
Grayscale histogram | ||||||||||
Echogenicity (0–255) | 90.98 | 13.42 | 88.14–93.81 | 86.62 | 14.85 | 80.55–92.68 | 92.57 | 10.97 | 89.86–95.28 | −6.43 |
Variance | 767.57 | 207.20 | 723.77–811.36 | 789.63 | 180.44 | 715.88–863.37 | 759.51 | 150.15 | 722.44–796.59 | 3.96 |
Skewness | 0.54 | 0.25 | 0.49–0.60 | 0.63 | 0.20 | 0.55–0.71 | 0.51 | 0.20 | 0.46–0.56 | 24.15 |
Kurtosis | 3.61 | 0.83 | 3.43–3.78 | 3.78 | 0.75 | 3.48–4.09 | 3.55 | 0.58 | 3.40–3.69 | 6.68 |
Entropy | 6.74 | 0.15 | 6.71–6.77 | 6.73 | 0.11 | 6.68–6.78 | 6.74 | 0.12 | 6.71–6.77 | −0.15 |
Co-occurrence matrix | ||||||||||
Contrast | 0.90 | 0.16 | 0.86–0.93 | 0.84 | 0.16 | 0.78–0.91 | 0.92 | 0.13 | 0.89–0.95 | −8.33 |
Energy | 0.14 | 0.04 | 0.13–0.15 | 0.15 | 0.03 | 0.13–0.16 | 0.14 | 0.03 | 0.13–0.14 | 5.76 |
Homogeneity | 0.73 | 0.03 | 0.72–0.73 | 0.74 | 0.03 | 0.72–0.75 | 0.72 | 0.02 | 0.72–0.73 | 1.95 |