This study checks how well a new medicine, sonelokimab, works for adults with a type of arthritis called psoriatic arthritis (PsA). PsA is a condition causing joint pain and swelling, and it often comes with skin problems like plaque psoriasis (PsO). Some people with PsA don't get better with usual treatments called anti-TNFα, which are medicines that reduce inflammation. This study compares sonelokimab to a fake treatment, called a placebo, to see if it's safe and helpful. It also looks at another medicine, risankizumab, for comparison.

• The study lasts for several months and requires multiple visits to the clinic.
• Participants might receive compensation for their time and travel expenses.
• Risks include possible allergic reactions or side effects from the study drugs.

To join, you must be 18 or older, have tried anti-TNFα without success, and meet specific health criteria. You cannot join if you have other inflammatory diseases or certain allergies. If interested, discuss with your doctor if joining this study is right for you.