You can try different NSAIDS - my daughter has both IBD and spondyloarthritis. She has been kept on NSAIDs because her arthritis is much worse than her Crohn's.
Celebrex is usually what is used since it's easier on the stomach. A PPI can be added to protect the stomach, or Zantac. Voltaren is usually pretty hard on the stomach, but other NSAIDs like Mobic and Celebrex are used often for people with arthritis and IBD.
In addition to NSAIDs, biologics and Methotrexate are used for arthritis and IBD. The anti-TNFs are most commonly used - Remicade, Humira, Cimzia, Simponi. Stelara is another option - an IL-12 and IL-23 inhibitor.
My daughter has needed a biologic plus immunomodulator plus NSAID. We also use Voltaren gel and ice packs and heat. Swimming helps a lot too as well as regular physical therapy and massage.