Unfortunately , pain doesn't show on X-rays and arthritis is notorious for not showing up in some circumstances. So it still could be arthritic changes at the joint surfaces, particularly after some trauma.
My gran and my mum are crippled by arthritis and then it started happening with me and I'm not 50 yet
Couldn't walk for the pain in my ankles when I got up in the mornings, fingers and toes throbbing so I couldn't think of anything else, hip so bad I couldn't get comfortable asleep or in a chair.
Did some research. Cut out gluten. What a change!
Now I wasn't aware that I was reacting to gluten beforehand, happily ate bacon butties and biscuits. But cutting it out has reduced my joint pain to almost nothing. And if I give in and eat some, the next day I hurt a lot.
Mentioned it to my neighbour, who said that his mother had just been put on a gluten-free diet by the doctor for her joints.
So worth a try? There are so many gluten-free alternatives now that it isn't as hard as it once was.
anyway, I know what it's like to hurt