J Rheum Dis.  2020 Jan;27(1):51-60. 10.4078/jrd.2020.27.1.51.

Clinical Usefulness of Uric Acid as a Biomarker for Knee Osteoarthritis: A Comparative Analysis With Plain Radiography and Musculoskeletal Ultrasound

Affiliations
  • 1Division of Rheumatology, Department of Internal Medicine, Daegu Catholic University School of Medicine, Daegu, Korea. kimsk714@cu.ac.kr

Abstract


OBJECTIVE
The aim of this study was to determine the relationships of serum and urine uric acid with severity or activity in knee osteoarthritis (OA).
METHODS
A total of 42 patients with knee OA was enrolled, together with 58 healthy controls. Serum uric acid and spot urine uric acid levels were assessed for all patients. The severity and activity of knee OA were assessed by musculoskeletal ultrasound (MSUS) and plain radiography of the knee joint. Ultrasonographic abnormalities in knee OA includedsynovial hypertrophy, suprapatellar effusion, cartilage degradation, and osteophyte formation. Kellgren-Lawrence (K-L) grade was used to evaluate radiological progression of knee OA.
RESULTS
Patients with K-L grade III had a higher urine uric acid/creatinine ratio compared to those with K-L grade I (p=0.043). Patients with synovial hypertrophy had higher serum uric acid level compared to those without synovial hypertrophy (p=0.016). The urine uric acid/creatinine ratio was higher in patients with cartilage degradation compared to those without cartilage degradation (p=0.022). Serum uric acid was significantly associated with synovial hypertrophy thickness (r=0.375, p=0.018) but not with cartilage thickness after adjusting for age and body mass index. Lower urine uric acid was related with knee OA compared to healthy controls (odds ratio=0.974, 95% confidence interval 0.954~0.994, p=0.013).
CONCLUSION
The results of our study suggest that serum and urine uric acid reflects synovial inflammation based on MSUS and radiographic progression and then is associated with the pathogenesis of knee OA.

Keyword

Ultrasound; Radiography; Knee; Uric acid; Osteoarthritis

MeSH Terms

Body Mass Index
Cartilage
Humans
Hypertrophy
Inflammation
Knee Joint
Knee*
Osteoarthritis
Osteoarthritis, Knee*
Osteophyte
Radiography*
Ultrasonography*
Uric Acid*
Uric Acid

Figure

  • Figure 1 Comparison of uric acid and uric acid/creatinine ratio in serum and urine between patients with knee osteoarthritis and healthy controls. OA: osteoarthritis.

  • Figure 2 Comparison of uric acid and uric acid/creatinine ratio in serum and urine according to Kellgren-Lawrence grade of knee osteoarthritis.

  • Figure 3 Multivariate analysis for correlation of uric acid with synovial hypertrophy and cartilage thickness in knee osteoarthritis. p-values were assessed after adjustment with age and body mass index.


Cited by  2 articles

Ultrasound Findings were Associated With Radiographic Changes, But Not Clinical and Functional Outcomes in Hand Osteoarthritis
Seong-Kyu Kim, Ui Hong Jung, Ji-Won Kim, Jung-Yoon Choe
J Rheum Dis. 2021;28(1):17-24.    doi: 10.4078/jrd.2021.28.1.17.

Serum and Urine Uric Acid as a Biomarker in Osteoarthritis
Jae-Bum Jun
J Rheum Dis. 2020;27(2):75-77.    doi: 10.4078/jrd.2020.27.2.75.


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