Proximal patellar enthesitis treatment with ustekinumab in a patient with psoriatic arthritis: significant response documented by ultrasound and magnetic resonance imaging.

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.