O006. Clinical features of paediatric HIV arthropathy

Background Advanced HIV infection is associated with an inflammatory arthritis, however few reports have described this disorder in children. This study aimed to describe the clinical features of HIV arthropathy in a case series of children in South Africa and compare these with features of JIA. Methods Retrospective data were collected from HIV-infected children with HIV arthropathy enrolled in a Paediatric Rheumatology clinic in Cape Town, South Africa. Data from a recently described, published cohort of children with JIA enrolled in the same clinic were included for comparison. Ethical approval was granted by the Human Research Ethics Committee of the University of Cape Town, with a waiver for consent. Results Eleven cases of HIV arthropathy were identified. Cases predominantly affected boys (8/11), and the median age of onset was 10.3 years (IQR 6.9–11.6). Most cases presented in the setting of advanced immunosuppression, with a median absolute CD4+ count of 389 cells/uL (IQR 322–449) and median CD4+ proportion of 19.5% (IQR 14.8–25.0) at presentation. The clinical presentation was variable, with both oligoarthritis (6/11) and polyarthritis (5/11) being prevalent. All cases exhibited large joint involvement, which was usually asymmetrical. In addition, four children had asymmetrical small joint involvement. Associated features included enthesitis (4/11) and dactylitis (1/11). The most consistent laboratory feature was elevated acute phase reactants, and typical ultrasonographic findings were joint effusions and synovial hypertrophy. JIA and HIV arthropathy presented at a similar age, with median age at HIV arthritis onset of 10.3 years (IQR 6.9–11.6) versus 9.25 years (IQR 4.5–12.3) at arthritis onset in the JIA subgroup. HIV arthropathy cases were predominantly male (M/F ratio 3.0), whereas JIA cases had an equal sex distribution (M/F ratio 0.9). Oligo-articular disease was more frequently described in children with HIV arthropathy (55%), compared to those with JIA (38%). Conclusion In this series, most cases of HIV arthropathy exhibited asymmetrical large joint oligoarthritis or polyarthritis, and presented in older boys with advanced immunosuppression. HIV arthropathy appears to present at a similar age to JIA, with a comparable pattern of joint involvement to oligo-articular and poly-articular JIA subtypes.