Montyy,
My wife is disabled with a back condition that limits her mobility and leaves her with chronic pain.
We bought a book. It is titled: Daily sex, 365 positions and activities for a year of great sex!
Author is Jane Seddon
ISBN is 0-446-69127-5
We got ours at Barnes and Noble.
This is a great book! Not only does it have 365 different positions, it has line drawing type pictures and detailed descriptions of each position and the language used would offend none but the most prudish of people.
It also has an empty thermometer on each page so you can color it in with how hot you found that position-great for later reference.
We also bought a sexual pleasure swing which is great for keeping pressure off her back while giving us several options for position. You have to put a large screw eye into the ceiling to hold up the swing. Alternatively, if a big eye is not an option, they sell a standing frame fro the swing.
The swing was about $200 and if you need to get the stand, it will cost another $200-300. Very much worth the money if it helps.
We also found a sling that attaches to each ankle and has a pad to go behind the shoulders. It is adjustable and holds her legs up and back the amount we want without her having to use muscle power to keep them there. This lets her devote that energy to our love making. It was relatively cheap and works well.
I hope at least one of these things helps. The book is especially nice not only because it gives ideas for positions you probably haven't thought of, but she can browse it and say that won't work but this one might so let's try it. The book is paper bound and fits easily into the nightstand drawer.
Good luck, happy experimenting and keep us posted(if you like) it would be nice to know if any of these things helped.