Purpose: * Assessment of ultrasound MASEI index in axial spondyloarthritis and in healthy subjects, athletes or not * Comparison of the ultrasound semiology of enthesitis in the 3 populations * Comparison of the MASEI scores in the 3 populations
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AI-rewrites the medical criteria so a patient or caregiver can understand them. Always confirm with the trial site.
enthesitis detection
Timeframe: 12 months