Research done: Googled 'gunshot wound knee', 'kneecapping', 'shattered kneecap removal', and 'shattered kneecap removal recovery'; looked through tags on here
Summary: Jacob (mid-30s, healthy, athletic) is shot in the knee while being interrogated by a terrorist organization. From my research I've deduced that he'll be on crutches and in a brace for a while then using a cane while he continues physical therapy. My problem is that I can't figure out if he'll be using the cane for the rest of his life with a noticeable limp or if he'll be able to walk normally with only a slight limp on cold days/days where he's overtaxed the wounded leg. All the websites I found on google about kneecapping gave the definition, not what physically happens to the kneecap and ligaments. I figure the kneecap and ligaments will be heavily damaged if the bad guys have Jacob's leg extended when they shoot him.
Also, I'm curious how soon after the initial hospitalization he'll be able to fly home to California from Europe (most likely eastern Europe).
Edit: I know nothing about guns and bullet calibers, so any help there would be greatly appreciated