Thanks for your replies, don't think I will bother getting one, but might see if anyone I know has one I could tryout first.
My latest knee x rays show moderate degeneration and doc says I am years off replacements. None of the strong painkillers I have been prescribed for my jaw pain or those I took whilst I was having having (failed) kidney stone bashing have taken away the constant pain when walking.
I am now trying voltarol gel after ibrufen gel is another failed drug.
Any other suggestions welcome.
So now I am restricted in doing my 2 hobbies, can't go to jive dancing because of knees and can't go to choir because of my jaw. At least hobby no 3, knitting and sewing is still on at the moment as arthritis has only struck mildly in one knuckle so far!
My doctor says my arthritis, knees and top of spine is occupational, 35 years of grovelling on the floor with infants!