Septic arthritis is a severe infection associated with significant morbidity and mortality. Despite eradication of the microorganisms, persistent inflammation may lead to substantial long-term functional joint sequelae. The use of corticosteroids could reduce this inflammation, thereby improving functional joint outcomes and facilitating first-line medical treatment. The hypothesis of this study is that corticosteroid administration, in addition to antibiotic therapy, reduces persistent inflammation and improves functional joint prognosis in adult patients with acute septic arthritis.