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The article describes proximal patellar enthesitis treatment with ustekinumab in a 29-year-old man with psoriatic arthritis. Highlights include acute and remittent pain presented by the patient in 2016 at the right proximal patellar insertion, the patient's Psoriasis Area Severity Index score, and reduction of pain and decreased induration and desquamation of psoriatic plaques registered at week four.

Enteropathic arthritis (EA) is a spondyloarthritis (SpA) which occurs in patients with inflammatory bowel diseases (IBDs) and other gastrointestinal diseases. Diagnosis is generally established on the medical history and physical examination. It was, generally, made according to the European Spondyloarthropathy Study Group (ESSG) criteria. Rheumatic manifestations are the most frequent extra intestinal findings of IBD with a prevalence between 17% and 39%, and IBD is associated, less frequently, with other rheumatic disease such as rheumatoid arthritis, Sjogren syndrome, Takayasu arteritis, and fibromyalgia. Although the pathogenesis of EA has not been plainly clarified, the most popular theory supposes that joint inflammation occurs in genetically predisposed subjects with bacterial gut infections, provided an important evidence for a possible relationship between inflammation of the gut mucosa and arthritis. The management of patients with EA requires an active cooperation between the gastroenterologist and rheumatologist. [ABSTRACT FROM AUTHOR]