Clinical Features and Risk Factors for Baker's Cyst in Patients with Rheumatoid Arthritis.

Abstract

Baker's cyst (BC) is a complex complication of rheumatoid arthritis (RA), with a poor prognosis. This paper aimed to analyze the clinical features and risk factors for BC in patients with RA to assist clinicians in early warning and appropriate action. The Clinical features of hospitalized RA patients with knee affected were analyzed retrospectively. The R software was used for the statistical analysis, while logistic regression analyses were used to determine independent risk factors. A total of 367 RA patients with knee affected were studied, and BC was diagnosis in 15.3% of them. The BC group exhibited a higher proportion of knee-only affected than the non-BC group (p < 0.05), while the attributes linked to disease activity exhibited no disparity. Logistic regression analyses selected two independent risk factors for BC: knee-only affected and anemia. 26.8% of patients with BC developed rupture, exhibiting a higher proportion of knee-only affected (p < 0.05), compared to those unruptured. The occurrence and rupture of BC in RA patients were significantly related to local inflammation, but not to systemic one. Incorporating local treatment may be a more advantageous option compared to solely relying on systemic therapy.