Sandhivata and rheumatoid arthritis are two different entities..
According to Ayurveda sandhi vata is definitely curable, provided you follow the medication n instruction given time to time.
However causative factor behind this condition has to get removed..
Your PC work with improper hand position seems to be the cause..
Along with that your routine n diet habits may have some causative factors.
Please ask physician to be precise about change in lifestyle..
Next Steps
medication written seems to be proprietary one. so can't confirm about treatment.