That is not true actually - my daughter is seeing an endocrinologist specifically because she developed Cushing's syndrome and adrenal insufficiency from long-term steroid use. She was mostly on 15 mg of Pred or under - usually under 10 mg.
She did do some courses starting at 20-25 mg and tapered down, but MOST of the time she was on steroids, she was on less than 10 mg.
But she was on it for 6 years on and off. Probably 6 months a year on steroids.
Eventually she developed Cushing's - the big round puffy face, the stretch marks, weight gain (30 lbs) that still has not gone away, the "buffalo hump." As you can imagine, as a young adult, she was very distressed by all this.
We were sent to an endocrinologist who told us that rheumatologists and GIs use steroids far to liberally. And also, to an endocrinologist, low dose Pred would be between 3-5 mg.
10 mg is considered a high dose. The endo ranted for quite a while about GIs and rheumatologists who get their patients into this position from using steroids too easily.
My daughter also developed adrenal insufficiency from being on steroids. Her adrenal glands are essentially asleep. She has to be given replacement hydrocortisone and could go into adrenal crisis with any sort of stressor (a cold, anesthesia, bad diarrhea etc.).
Adrenal crisis can be fatal. Yes, fatal.
Believe me, these are not side effects you want to deal with. I am just cautioning you because like you, we were told that 10 mg is a low dose. She was on it for far too long. She has very aggressive AS, which affects her SI joints, lumbar spine, ankles, knees, hips, feet, elbows, fingers, jaw and wrists. I'm sure I have forgotten a few joints.
We were trying to prevent joint damage and perhaps the years on steroids did help prevent some. But she ended up with so many side effects - besides adrenal insufficiency and Cushing's, also low bone density.
I hope the increased frequency of Stelara will help you. Hopefully that plus the Sulfasalazine will get your knee inflammation under control.
In terms of stress doses of steroids, you need to see an endocrinologist who will do testing to see what your ACTH and cortisol levels are.
In terms of anti-TNFs, they are not a bad choice if you have to go there. Of course, there is guarantee, but since they have been around a lot longer, there are MANY studies confirming that they work for both Crohn's and for joint inflammation. They are approved for various types of inflammatory arthritis - Ankylosing Spondylitis/Spondyloarthritis, Psoriatic arthritis, RA. So hopefully they would work for both your issues. They do for many patients with IBD + inflammatory arthritis - they are generally the first choice.
The dosing schedule is more frequent, but it's a 10 second shot at home if you are on Humira/Cimzia or Simponi. If you're on Remicade, then yes, infusions are definitely more inconvenient.
But I hope they are able to get more frequent Stelara covered, since it is definitely helping you. Just know that you do have options that are not steroids.