I don't know about any bony sprainy disease, but I do have a permanently injured finger. Jammed by a high-velocity soccer ball it swelled up immediately. Two-three months later and still in pain I go to the doctor, he sends me to a specialist (don't remember what type, sorry). Specialist says I tore the lateral ligaments in the joint. Gave me a compression wrap that allowed mobility and told me to use it until the roll was gone.
4 years later the joint is still permanently swollen and I cannot pop that knuckle without extreme pain (I don't even try). But I still do have full range of motion in that joint.
Funny enough the specialist told me the smartest thing I did was not go to a doctor because they always splint your finger and keep it immobilized. That leads to atrophy and loss of range of motion. By constantly using it I kept full use and strength in that finger. Both the doctor and the specialist had that same injury in other fingers and had range of motion problems because their fingers got splinted.
I wouldn't reccomend to not go to a doctor, but keep what I said in mind if they try to spling you up. Best wishes.
We should all take ourselves seriously...and then crumple that image up and toss it out the window.