During my younger years, I was fairly active in a variety of sports. The results...my knees are quite "fragile". A few years back, when I took up sea kayaking, I soon discovered that my knees were still hurting after some time in the kayak. It's the lateral bending that did it. I needed a solution.
If you look at the pics, you will see that the solution is a very cheap one and it works like a charm. Not only does it brace you nice and snug but it is also adjustable into different positions. It is not long enough to entrap your legs in case of a wet exit and you can put the noodle to other uses around camp.
Try it...you'll like it!