Hi,
Twenty odd years ago I suffered a prolapsed disc. I was admitted to hospital with no, no, sensation or control below T8, think at the lower end of the ribs. Fortunately the brilliant NHS operated and gradually got me to the stage of moving around vertically, with a stick, although there are other problems which will not be 'fixed'. My 'walking' is stuttering and I occasionally trip over match sticks.
My difficuly in getting around tends to mean that I spend too much time sitting, often in front of the computer for far too long, Patagonian Nose flutes are so interesting you know. Then I get back pain, although luckily woodwork does not seem to bother me too much, other than aching legs.
Someone suggested a Bambach Stool " The Bambach Saddle Seat
http://www.bambach.co.uk/ ". Now I looked at one and being a woodworker decided to make an imitation. The effect was brilliant , not instant, but noticeably less back pain. More to the point using the stool when my back was bad eased the situation. Sadly I could not easily get on the thing, I cannot lift my leg high enough either from the front ot the back. Enter the Wave Seat " The Wave Seat Company
http://www.posture-chair.co.uk/ " fortunately their site suggests a method of producing a home mock up. Yeah! it works.
Of course then I had some research to do and I came across the work of A.C. Mandal " Balanced Beating Posture on Forward Sloping Seat
http://www.acmandal.com/ ". His paper, to me, points to the need to open the spine/thigh joint in order to put the spine in a more restful position. It works. Whereas I used to slouch over the desk using the PC, getting back pain and stiffness, I now use a tilted seat stool, home made, to beneficial effect. Although it took a little while to get used to my posture has improved, my prolonged PC/Desk use is not painful and my whole mental attitude is more alert.
I have no comercial interest with any of the parties mentioned, and no medical training.
HTH, xy