I actually tried that, tying a long sock under my knee, because I was mid-way through a long section and was desperate, literally hobbling on the downhills. Unfortunately, it didn’t help.
I’d run into Del Doc that trip in '02, and he suggested tying my stream-soaked banadana under the knee cap to get me to my car. Unfortunately, that didn’t help either.
I’ve tried every brace out there subsequently, and the one that permits me to hike is the ChoPat Dual Action. It keeps my kneecap tracking when my quads tire, as they often do on a section when I am not thruhiker fit.
I agree with having your knee checked out, but testing a $25 brace that keeps you kneecap aligned is a whole lot cheaper than a doctor’s visit. If it solves the problem, fine. If it doesn’t, keep looking and not a whole lot of money lost. If you’ve torn something and need surgery, a brace won’t change anything - you’ll know it.
My support needs were definitily a fitness issue. Although I am lean (or rather, WAS - now I am “leanish” LOL!), the up and down of trails puts a strain on my leg muscles that normal life or even “the gym” doesn’t. After a few weeks of hiking, I can leave the brace off for hours at a time, putting it on in the morning to warm up my joints, and then putting it on again later in the day. But it’s a companion with me on all my section hikes now, even strenuous day hikes.
You do strengthen out of the ChoPat, which was one of my worries - would a brace further weaken supporting structures? I can answer, an unqualified “No!”
By Catawba,VA on my thru, I had shipped one of the ahead with my winter gear to the Whites, and kept the other for emergencies. But I rarely used it. However, once in the Whites, with the step-and-lift of hiking there, I REALLY was glad of them. And you couldn’t argue I wasn’t walking fit - just not fit for the new demands of the fabulous and demanding “trail” there.
If there was a cheaper brace, or a knockoff that would work I would certainly tout it. This is just the only thing that has worked for me.
Jan LiteShoe