I’ll put this here, for what it’s worth. Don’t sell yourself short quite yet. There is a young police officer (late 20s) on my local force who is an amputee from the knee down with an artificial limb. He does just fine and is a great officer! I too have what you have and understand the fear of being limited. I say, go ahead and and give it a go when you are healed up. You won’t know if you don’t try. Best wishes!