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Background: Ultrasonography (US) is the cheaper and non-invasive modality to determine Achilles tendon. Prone position is the standard position of Achilles tendon US. However, it is a discomfort for an uncooperative patient and a difficult technique too. The erect position is an alternative technique of Achilles tendon US. The goal of this study is to compare the erection as an alternative position with prone as a standard position. Material and Method: The patient who had an injury or any inflammation process of Achilles tendon were excluded. The patient underwent two positions of Achilles tendon US, 90∘ and dorsiflexion. Longitudinal axis measured tendon thickness and transversal axis covered the cross-sectional area of tendon. Result: From all the 21 patients coming, 13 patients were males (61.9%) and 8 were females (38.1%). The mean of tendon thickness and cross-sectional area in 90∘ prone position were 4.24 ± 0.24 mm, 30.08 ± 2.86 mm, respectively. The mean of tendon thickness and cross-sectional area in 90∘ erect position were 4.27 ± 0.23 mm, 31.36 ± 2.19 mm, respectively. There was no anisotropy effect during longitudinal axis examination. Conclusion: We found that there was no significant differences between prone and erect position (p < 0.05). The erect position could be an alternative position, uncooperative patient in particular, without reducing the diagnostic value.     Keywords: Achilles tendon US, erect position, prone position, tendon thickness, cross-sectional area

Erect Position as the Alternative Technique in Achilles Tendon US: Comparison with Prone Position