 Chikungunya is a viral disease transmitted by mosquitoes whose clinical feature is the early joint damage. Approximately 8 of patients have chronic arthropathy resembling to the rheumatoid polyarthritis. The EchoCHIK study we propose is in the context of the epidemic in Martinique which began in January 2014. It should give a better understanding of arthritis and juxtaarticular of CHIK and look for signs that may allow ultrasound predict the evolution of chronic arthropathy of CHIK. 