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  • Title: Entheseal involvement of the lower extremities in gout: an ultrasonographic descriptive observational study.
    Author: Xu G, Lin J, Liang J, Yang Y, Ye Z, Zhu G, Cao H.
    Journal: Clin Rheumatol; 2021 Nov; 40(11):4649-4657. PubMed ID: 34156566.
    Abstract:
    OBJECTIVE: The aim of this study was to explore the prevalence and distribution of lower extremity entheseal abnormities by musculoskeletal ultrasound (US) in a cohort of gout patients, taking spondyloarthritis (SpA) patients and asymptomatic hyperuricemia (HUA) patients as controls. METHOD: One hundred participants with gout, fifty patients with SpA, and twenty-nine patients with asymptomatic HUA were recruited. US was used to assess the bilateral quadriceps, patellar and Achilles tendons, and plantar fascia entheses according to the Outcome Measures in Rheumatology (OMERACT) definitions. RESULTS: The US examination revealed the presence of one or more abnormalities in at least one enthesis in 45 out of 100 subjects (45.0%) and 152 out of 1000 entheses (15.2%) in the gout patients. Among the affected entheses, the patellar insertion of the quadriceps tendon was the most commonly involved area (38.0% in the gout patients versus 48.0% in the SpA patients with at least one pathological US finding, p = 0.241). There were no significant group differences in entheseal power Doppler (PD) signals, bone erosion, or enthesophytes. The patients with lower limb entheseal involvement in the gout group had an older age, longer disease duration, higher percentage of chronic tophaceous gout, and higher levels of inflammatory biomarkers of the erythrocyte sedimentation rate (ESR) and C-reactive protein (CRP). Multivariate logistic regression analysis revealed that age (OR = 1.052, p = 0.001) and the ESR (OR = 1.023, p = 0.028) were correlated with lower limb enthesopathy in gout patients. In the subgroup analysis of gout patients without active inflammation, age (OR = 1.119, p = 0.001) and serum uric acid (UA, OR = 1.012, p = 0.002) were correlated with lower limb enthesopathy in gout. CONCLUSION: Lower extremity entheseal involvement might be neglected but should be considered as an important element in the evaluation of gout patients. Enthesopathy most frequently involves in the patellar insertion of the quadriceps tendon and is characterized by entheseal hypoechogenicity and/or thickening. Key Points • Lower extremity enthesopathy might be neglected as an important element in gout. • Enthesopathy is most frequently involved in the patellar insertion of the quadriceps tendon in gout. • Age and ESR are correlated with lower limb enthesopathy in gout patients.
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