walked up and down through some woods for about 5 hours yesterday. found out my knee started bothering me when going up hills. would've never known but it definitely slowed me down so now I'm going to add some sort of knee support to my gear.
trying to bug out won't get you far if body parts bug out on you first.
A lot of folks with knee problems say that trekking poles are a godsend. You might want to check them out.