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According to the criteria proposed by Ryan and McCarty,1 the diagnosis of calcium pyrophosphate dihydrate (CPPD) deposition disease has been based on radiological evidence of the characteristic calcifications and on verification of the synovial liquid of CPPD crystals.
Joint ultrasonography is an innocuous diagnostic technique that is well tolerated by patients, and is the elected method for observing calcified deposits in soft tissues.2
We carried out a longitudinal study, enrolling patients affected with ultrasonographic chondrocalcinosis according to previously proposed criteria3 from a sample of consecutive patients that came to our joint ultrasonography department for gonalgia (fig. 1). A total of 47 patients were identified, of which 14 had joint effusion.
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