I assume that you have had all the scans etc that have been mentioned, and that the walking poles were advised by someone who knows what they are talking about?
I have NOT injured my legs, so my experience is probably irrelevant, but I do own a pair of walking poles, relatively cheap ones as they are not used much, seldom out on rough ground. I bought them as a precaution when I had sciatica a few years ago, and thought I might need them, but their main use is when the weather is awful, or the ground is icy, and I have not been out of the house. If I use the poles, I am in "exercise mode" and my hands stay through the straps for the fifteen minutes (or whatever) that I am striding from room to room, round tables and armchairs, getting in my "weighbearing exercise" Without them , I feel daft to be marching around, so I don't do it.
As you use a pair of them, what they are good at is keeping your back straight while you walk, and not letting you lean over to one side, as you do on a single walking stick, favouring one leg more than the other.
You need to use them properly - they are not the same as walking sticks.
They adjust for height, which should be so that when holding them your elbow is at 90 degrees and your forearm is parallel to the ground. You shoud always have your hands through the retaining loops so that if you let go of one, you don't have to bend right down to retrieve it, and if you are on a slope it won't sail off down the mountain without you! Put your hand through the loops from below upwards, and hold the handles. You move each one forwards while stepping with the opposite leg, like swinging your arms as you walk. Once you get the rhythm, they are very comfortable to use.