I m a 66 year old female and have a chronic back injury, compressed L1 which the insurance company declined surgery on to repair. I have been falling a few times a month, have been having some difficulty with shortness of breath and muscle weakness, primarily in my legs. Any idea if this is from my back? I had a meniscus tear several years ago and the doctor at that time said I would probably need a knee replacement (left) as it had a fair deal of arthritis in it.