It is definitely very good to prevent and cure arthritis and I use it for this.
My father, who is in his 80s swears by it too.
There are books on the subject by Margaret Hills SRN:
Hills suggests that we get arthritis from the food and drink we consume if these things contain purines, which convert to acid crystals that accumulate in the joints and cause pain. Citrus fruit and black tea are two main culprits she lists. Her method of treatment is to cut out the offending food sources and to take regular doses of cider vinegar.