RISkinsFan doesn't post enough to be able to post links

, but I'm his girlfriend so I'll post it for him.
Teeter Hang Ups - Inversion Products - Inversion Tables
This site also has more medical information as well as statistics:
Using Your EP-550 Inversion Table
He has the F7000 model, which is the one shown on the homepage. He researched inversion for a year before getting the table and Teeter has the best reputation that he's found. The website pretty much explains everything so I won't get into how it works.
I will say this though. He uses it everyday and 90% of the time it relieves a great deal of his pain.
Cortisone was horrible for him. It put him in the hospital every time and once, emergency surgery was even considered as a result. I'm not saying don't have the shots. I'm simply saying what happened to him. You know your body better than anyone, so do what you think is best.