6 109 Ultrasonographic Achilles Tendon Thickness: Insertional vs. Midportion Reliability patients diagnosed with AT. An ICC value of less than 0.5, ranging from 0.5 to 0.75, ranging from 0.75 to 0.9 and above 0.9 were respectively classified as ‘poor’, ‘moderate’, ‘good’ and excellent.25 We also calculated the standard error of measurement (SEM = √total mean square within people) and smallest real difference (SRD = 1.96 × SEM × √2).26 Smallest real difference can also be referred to as minimal detectable change (MDC), which is calculated in the same manner. IBM SPSS Statistics (version 28.0.1.0) was used for statistical analyses. RESULTS One hundred UTC scans in the database were assessed by the two researchers. One UTC scan of a patient with insertional AT was excluded because of an artifact caused by a large air bubble within the scan gel (both researchers independently agreed on this). Consequently, 99 UTC scans were included in the analyses. The sports physician performed all thickness measurements of the conventional US in the remaining patients with AT (n=49). The participants’ characteristics are depicted in Table 1. Patients with AT had an average symptom duration of more than five years. Maximum tendon thickness using UTC is also displayed in Table 1. Mean ± SD tendon thickness in AT patients was 8.3 ± 2.2 mm (midportion) for patients with midportion AT and 5.4 ± 1.3 mm (insertion) for patients with insertional AT. There were significant differences in age and Body Mass Index (BMI) between the AT and asymptomatic group.
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