I have ra, suddenly my ringfinger knuckles are invertet. no pain but moves in jumps. what causes this and is it likely to happen to all joints?

RA: It could be due to metacarpo phalangeal joint sub-luxation. It is common in chronic RA and can happen over time . It is not uncommon and can involve similar joints of other fingers and toes. Your specialist cn make. Diagnosis on exam and will require an x-ray to confirm.

See details: It sound like early swan-neck deformities related to damage to the supports of the joints. It is indicative of disease that needs to be under better control. Stop tobacco use as this is associated with more severe disease and speak with your rheumatologist about whether more aggressive control of the inflammation is needed.