Hey Roger,
Just my novice comments here - but I think you'd do best with a series of smaller ads with a simple headline like "Arthritis Pain?" - followed by copy like "A new Free report reveals the secrets to easing your arthritis pain - visit
www.website.com for complete details."
I know a local Chiropractor who does very well with a series of small ads like this using headlines like "Back Pain?", "Car Accident?" or "Slipped Disk?" - and then they all offer a free report available either online or by calling a toll free number.
Once you request the report you get a large envelope in the mail with the info promised, a number of pages of patient testimonials, and a coupon good for a free initial consultation vaild for 30 days. If he doesn't hear from you after a week or two a repeat mailing goes out - and he gets many patients to his practice this way running these ads week after week, year after year.
Hope that gives you some ideas!