My current treatment is Rinvoq 15 mg only. It is a selective JAKi and does not have known effect on bones. I supplement with Vit D (20000 UI weekly) and Omega 3.
I had a few corticosteroid injections (3-4 in the right shoulder over the course of 7 years and one in the ankle), which I know can weaken bones.
I took NSAID daily for 5 years (Celecoxib), it was messing up with my guts and I had loose and frequent (2-3 daily) bowel movements, with a struggle to put on any weight. I stopped a year ago as Rinvoq then was good enough on its own to stabilize my inflammation and did not need NSAID anymore. Since then I gained weight with much less struggle.
No other digestive issues, I am not celiac nor lactose intolerant. I had a colonoscopy last year and guts look healthy.
As an extra clue on nutrients: I have increased my dairy intake since I broke the bone and it seems to heal really well (I have not done a control X ray yet but swelling and pain are at zero, I can feel the callus at the fracture site, tolerance over active movement increase). A malnutrition issue would also slow healing.
One more thing. spiral fracture mid shaft of the humerus are a very common injury when arm wrestling, a search of the litterature or experience will show this is not rare. The humerus weakest tensile strength is via shear/torque stress. The break position in arm wrestling could be similar to a bad squat position: What is the break arm position in arm wrestling (please use pictures)? How can I arm wrestle safely without getting hurt? - Quora
Most likely I had a freak incident due to a fucked up grip and bar position rather than some undiagnosed medical condition. I will get a Dexa scan. If it is normal then end of. Ig it shows low bone density then will look at testosterone level, calcium in urine and possibly other tests.