6 111 Ultrasonographic Achilles Tendon Thickness: Insertional vs. Midportion Reliability between the midportion and insertional region. The 95% CIs of the ICC values did overlap between the AT patient group and the asymptomatic group, indicating that disease status has no significant effect on reliability of measuring Achilles tendon thickness. The SRD for intra-rater reliability ranged between 1.22 mm (midportion) and 1.51 mm (insertion) for AT patients and between 0.78 (midportion) and 1.07 (insertion) for asymptomatic participants. For inter-rater reliability the SRD was 1.47 mm (midportion) and 2.46 mm (insertion) for AT patients and ranged between 0.84 mm (midportion) and 1.17 mm (insertion) for asymptomatic participants. ICC values for the reliability between UTC and conventional US were classified as ‘good’ (0.81) for the insertional region and ‘excellent’ (0.96) for the midportion (Table 3). The SRDs between these two measurement techniques were 2.27 mm for the insertional area and 1.60 mm for the midportion area. Table 2. ICC values for inter-and intra-rater reliability of tendon thickness measurements using UTC. Abbreviations; ICC: intraclass correlation coefficient, CI: Confidence interval, SEM: standard error of measurement, SRD: smallest real difference Inter-rater reliability Intra-rater reliability ICC (95% CI) SEM (mm) SRD (mm) ICC (95% CI) SEM (mm) SRD (mm) Overall (total, n=99) 0.93 (0.91 – 0.95) 0.521 1.44 0.96 (0.95 – 0.97) 0.399 1.11 Midportion (n=75) 0.97 (0.95 – 0.98) 0.396 1.10 0.98 (0.96 – 0.99) 0.345 0.96 Insertion (n=74) 0.79 (0.69 – 0.87) 0.581 1.61 0.89 (0.84 – 0.93) 0.408 1.33 Achilles tendinopathy patients (total, n=49) 0.93 (0.88 – 0.96) 0.727 2.02 0.95 (0.92 – 0.97) 0.492 1.36 Midportion (n=25) 0.95 (0.90 – 0.98) 0.529 1.47 0.96 (0.92 – 0.98) 0.439 1.22 Insertion (n=24) 0.80 (0.61 – 0.91) 0.888 2.46 0.87 (0.74 – 0.94) 0.543 1.51 Asymptomatic participants (total, n=50) 0.91 (0.87 – 0.94) 0.366 1.01 0.94 (0.92 – 0.96) 0.340 0.94 Midportion (n=50) 0.94 (0.89 – 0.96) 0.301 0.84 0.96 (0.93 – 0.98) 0.282 0.78 Insertion (n=50) 0.71 (0.53 – 0.82) 0.421 1.17 0.81 (0.69 – 0.89) 0.388 1.07
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