IMPACT OF OVERWEIGHT AND OBESITY ON HIP INVOLVEMENT IN JUVENILE IDIOPATHIC ARTHRITIS

BackgroundThe prevalence of obesity among children is on the rise, becoming a worldwide epidemic. The overweight is also associated with mechanical stress in the weight-bearing joint especially in the hip joint. Previous studies showed that increased Body mass index was a predicting factor of a poor outcomes [1].ObjectivesIn this regard, we proposed to evaluate the effect of obesity on hip involvement in JIA patients.MethodsWe conducted a cross-sectional study including children with JIA according to the International League of Associations for Rheumatology (ILAR)). Transcribed data included age, sex and the characteristics of the disease (subtype of JIA, disease duration). Data on hip involvement was also collected. Weight and height of each patient was recorded. The body mass index (BMI) was calculated (Kg/m2). We compared these parameters between two groups: G1: presence of coxitis and G2: absence of coxitis.ResultsThe study included 62 patients with a male perdominance: sex ratio was 2.3. The mean age of onset of the disease was 11.4 years [3-16].The frequency of each JIA subset was at follows: polyarticular with rheumatoid factor (n=2), polyarticular without rheumatoid factor (n=4), systemic (n= 1), enthesitis-related arthritis (n=44), oligoarthritis (n=8), psoriatic arthritis (n=3). Hip involvement was reported in 71 % of cases and was bilateral in 81% of patients. The mean weight (Kg) and height (meter) was similar between the two groups (57.4 in G1 vs 53.6 in G2, p=0.486) and (1.61 in G1 vs 1.58 in G2, p=0.483) respectively. The prevalence of overweight patients was higher in G1 than G2 without reaching a statistically significant correlation (23% vs 12.5%, p=0.518). Similarly, there was no statistically significant correlation between the body mass index (Kg/m2) and coxitis (22.2 vs 21, p=0.45). Moreover, a higher BMI was not associated with a limited range of motion as well as hip replacement (p=0.7, p=0.1 respectively).ConclusionOur study showed that BMI did not impact hip involvement in juvenile idiopathic arthritis patients. As obesity confers an additional health risk, addressing this co-morbidity should be a health priority in these patients.References[1]Makay B, Gücenmez ÖA, Ünsal E. Inactive Disease in Enthesitis-related Arthritis: Association of Increased Body Mass Index. J Rheumatol. 2016;43(5):937-43.Disclosure of InterestsNone declared