Do you recommend an anti -inflammatory for someone with celiac disease and no intestinal issues for 2 years for osteoarthritis of knee?

Yes.: An anti-inflammatory agent - either a nonsteroidal agent like Ibuprofen or a corticosteroid like Prednisone - is not contraindicated for patients with celiac disease.

Normal: With controlled celiac disease the patient becomes otherwise essentially like everyone else. All meds have the same risks and benefits (except if they contain gluten, which some do)