I didnt notice the extra polys in the knee, you havent given me a wireframe image.I was just basing it off what I could see fromn casual observation - and it looks like a standard knee from other inf models.I can see other areas you have modified.
The problem is vertice binding, but without a proper image of the model I cant advise you any more.
Give me some shots of wireframe with bones - and perhaps the bone hierachy links displayed if you have made your own skeleton, and maybe I can help you.
You can always bind the vertices from the thigh polys at the back of the knee to the thigh, and the calf ploy verts at the same point to the lower leg bone.But this would only allow you about 90 degrees of bending before the edges of polys showed through the legs.
The only other thing I can think of is maybe you changed soemthing without "ANIMATION" highlighted.That always screws things.
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