Can we use enthesis ultrasound as an outcome measure of disease activity in spondyloarthritis? A study at the Achilles level

The aim of this study was to evaluate the construct validity of enthesis US in the assessment of disease activity in SpA.A longitudinal Achilles enthesis US study in patients with early SpA was undertaken. Achilles US examinations were performed at baseline, 6 and 12 months and compared with clinical outcome measures collected at the baseline visit.Bilateral Achilles enthesis of 146 early SpA patients (68 women) were analysed. Basal mean BASFI,...