AB0586 PREVALENCE OF EARLY SYMPTOMATIC KNEE OSTEOARTHRITIS ACCORDING TO THREE CLINICAL CLASSIFICATION CRITERIA

Background: Knee osteoarthritis (KOA) is a heterogeneous disease. Different classification criteria for symptomatic KOA (SKOA) have been proposed. Determining the prevalence and comparing different of SKOA in patients with knee pain will serve as base when studying predictive ability these longer perspective. Objectives: To study individuals according to three criteria: American College Rheumatology (ACR), (1), European League Against Rheumatism (EULAR)(2), National Institute Health Care Excellence (NICE) (3). Methods: Baseline data from an ongoing longitudinal (HALLOA) including 296 pain, recruited by advertisement, were analysed. The categorized (ACR, EULAR NICE) based on age, clinical examination (crepitation), self-reported KOOS (pain, symptoms, ADL, sport/recreation), dichotomized fulfilling or not (no SKOA). BMI was measured (kg/m 2 ). Radiographic (RKOA) assessed Ahlbäck (1-5), defined RKOA grade 1 more at least one knee. Prevalence calculated (frequencies, %) each criterion, Chi-Square test Independent-Samples t-test used comparisons between not. Results: mean age 52 (min-max 24-73) years, 70% women 22% classified RKOA. criterion 57% 51% (EULAR) 73% respectively. In total, 48% had all whereof 32% RKOA, compared 10% among no SKOA. Regardless significantly also SKOA, p<0.001. Those older higher (Table 1). Conclusion: Approximately 50-70% having where lowest prevalence. A better understanding early essential capture follow long-term prognosis Further studies are needed. References: [1]Altman R et al. Arthritis Rheum. 1986;29(8):1039-49. [2]Zhang W Ann Rheum Dis. 2010;69(3):483-9. [3]Health NIf, C. UK: Clinical Excellence. 2014. Table 1. Comparisons ACR, NICE osteoarthritis, stratified ACR Total OA No P-value N (% ) (100) 170 (57.4) 98 (33.1) 152 (51.4) 114 (38.5) 215 (72.6) 58 (19.6) Age (Y), Mean (SD 51.6 (8.7) 53.3 (7.0) 49.0 (10.3) <0.001 54.5 (5.1) 48.1 (10.8) 54.7 (4.9) 40.5 (9.8) Gender , female 208 (70.3) 121 (71.2) 66 (67.3) 0.511 108 (58.4) 77 (67.5) 0.538 154 (71.6) 36 (62.1) 0.160 ), 26.4 (4.6) 26.5 (4.5) 25.8 (4.3) 0.179 26.9 25.4 (4.2) 0.005 26.7 24.8 (3.8) 0.004 n 64 (21.6) 45 (26.5) 12 (12.2) 0.003 47 (30.9) 10 (27.0) (1.7) Independent-samples Chi-2-test. Bold =Significant correlation (p?0.05). = Osteoarthritis. Rheumatology. Rheumatism. Body Mass Index. Osteoarthritis (Ahlbäck, ?1 knee). Disclosure Interests: None declared.