Musculoskeletal ultrasound features-based scoring system can evaluate the severity of gout and asymptomatic hyperuricaemia

Fengjing Liu; Si Chen; Zhumeng Hu; Jie Chen; Lixin Jiang; Shen Qu; Haibing Chen

doi:10.1177/1759720X211006985

Musculoskeletal ultrasound features-based scoring system can evaluate the severity of gout and asymptomatic hyperuricaemia

Ther Adv Musculoskelet Dis. 2021 May 12:13:1759720X211006985. doi: 10.1177/1759720X211006985. eCollection 2021.

Authors

Fengjing Liu¹, Si Chen¹, Zhumeng Hu², Jie Chen³, Lixin Jiang⁴, Shen Qu⁵, Haibing Chen⁵

Affiliations

¹ Department of Endocrinology and Metabolism, Shanghai Jiao Tong University Affiliated Sixth People's Hospital, Shanghai Clinical Center for Diabetes, Shanghai Diabetes Institute, Shanghai Key Laboratory of Diabetes Mellitus, Shanghai Key Clinical Center for Metabolic Disease, Shanghai, China.
² Department of Endocrinology and Metabolism, Shanghai 10th People's Hospital, School of Medicine, Tongji University, Shanghai, China.
³ Department of Ultrasound, Shanghai Jiao Tong University Affiliated Sixth People's Hospital, Shanghai, China.
⁴ Department of Ultrasound, Renji Hospital, School of Medicine, Shanghai Jiao Tong University, 160 Pujian Road, Shanghai 200127, China.
⁵ Department of Endocrinology and Metabolism, Shanghai 10th People's Hospital, School of Medicine, Tongji University, 301 Yanchang Road, Shanghai 200072, China.

Abstract

Objectives: To develop a tool which can evaluate the severity of the joint injury in individuals with gout and asymptomatic hyperuricaemia.

Methods: This retrospective study included 616 male patients: 245 with asymptomatic hyperuricaemia and 371 with intercritical gout. All patients underwent ultrasonography of the knee, ankle and first metatarsophalangeal (MTP) joints. Ultrasound features that were significantly different between groups were entered into a binary logistic regression analysis to identify discriminative factors. The ultrasound signs were scored based on their odds ratios, which were then used to evaluate the severity of gout and asymptomatic hyperuricaemia. The performance of the ultrasound score was validated in an additional population including 163 patients with asymptomatic hyperuricaemia and 196 patients with gout.

Results: Ultrasound signs were scored as follows: knee joint: synovial effusion, 2 points, tophus, 5 points; ankle joint: synovial effusion, 2 points, synovial hypertrophy, 5 points, tophus, 3 points, bone erosion, 7 points; and first MTP joint: double contour sign, 2 points, synovial hypertrophy, 3 points, tophus, 9 points, bone erosion, 4 points. The maximum possible total score was 42. The optimal cut-off score for gout was 6.5. The sensitivity, specificity and area under the receiver operating characteristic curve (AUC) were 86.9%, 75.2% and 0.878, respectively. The patients were stratified according to their ultrasound score (range 0-42). The prevalence of intercritical gout, tophi, and bone erosion increased with the increase of the score. In the validation population, 83.20% of 193 patients with gout had ultrasound scores above 6.5; 76.10% of 163 patients with asymptomatic hyperuricaemia had ultrasound scores under 6.5.

Conclusion: The scoring system based on the differential ultrasound signs can effectively evaluate the severity of joint injury in individuals with gout and asymptomatic hyperuricaemia.

Keywords: asymptomatic hyperuricaemia; intercritical gout; predictive scoring system; ultrasound.