Performance of Ultrasound in the Clinical Evaluation of Gout and Hyperuricemia

Abstract

Objective Evaluation of monosodium urate (MSU) crystal deposition and related lesion in joints using ultrasound in gout and hyperuricemia patients. Methods Total 202 gout patients and 43 asymptomatic hyperuricemia patients were included, the clinical data and ultrasounic assessment results were collected and statistically analyzed. Results Deposition of MSU crystals were found in 25.58% (11/43) of the patients with asymptomatic hyperuricemia and 76.24% (154/202) of the patients with gout. In the all examined 1082 joints from gout patients, 33.09% (358/1082) of them were detected MSU crystals. In MSU crystal positive joints, 77.37% (277/358) of them had history of attacks. Among the joints of gouty arthritis, 56.88% (277/487) of them were found MSU crystals. Double contour sign (DCS), hyperechoic aggregate (HAG) and Tophi were found in 32.65% (159/487), 7.80% (38/487) and 24.64% (120/487) of the joints, respectively. DCS and Tophi, but not HAG, appeared inceasingly in gout duration extension. In the patients with more than 15 years of gout history, DCS, Tophi and HAG were found in 48.18%, 40.00%, 6.36% of US assessed joints, respectively. In the gout patients, synovial lesion and bone erosion were found in 17.74% (192/1082) and 7.58% (82/1082) of joints, respectively. Synovial lesion was related with HAG, while bone erosion was related to tophi and DCS. Conclusion HAG is the early sign of MSU crystal deposition in joints. Early urate lowering therapy (ULT) may reduce HAG and ameliorate synovitis and synovial hypertrophy. DCS and tophi are the risk factors of bone erosion. Early ULT should be considered in the gout patients with DCS or tophi.