Oh BWT! How awful for you! Sounds painful. I know those back problems but haven't had any problems with weakness in the leg. I have bulging and herniated discs in my lumbar region plus tailbone pain. Falling down stairs last fall didn't help that any...ended up fracturing one of the bones in the coccyx, can't remember which one.
And aren't knee problems just a beotch? Oi vey.
I feel for you. I hope you find these forums as valuable as I do. Many great folks.
Welcome.