106 Chapter 6 Outcome measures Conventional ultrasound The largest anterior-to-posterior (AP) diameter of the Achilles tendon was estimated in the transversal view, in line with current clinical and research practice.7,15 This section of maximum thickness was frozen and subsequently the thickness was directly measured in millimeter (mm), rounded to one decimal (Figure 1). This procedure was performed for the Achilles tendon midportion, insertional region, or both, based on the location of symptoms (data were only collected from the region(s) in which patients experienced symptoms). Figure 1. Achilles tendon thickness measurements with conventional ultrasound of the insertion (A) and midportion (B) of the tendon. The largest AP diameter of the Achilles tendon perpendicular to the latero-medial width was measured in the transversal view.9 This section of maximum thickness was frozen and subsequently the thickness was measured directly (yellow dotted line).
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