When comparing what we are feeling it makes sense to make sure we are doing the same thing. To me high edge angles mean the hip is no more than 12" off the snow and the front of the boot is getting crushed. This is the type of carving where I feel the extra 10mm in my knees.
I disagree Max. The reason wider skis can be harder on the knees is simple physics and not really related to how high the edge angles. A 66mm skis is 33 mm from center to edge; an 88mm ski is 44 mm from center to edge. Skiing exactly the same on the 88 mm ski is going to require 33% more force through the ankle and the muscles around the knee, no matter how high the edge angles or the speed.
I agree, however, that if you are making turns where your hips are 12" off the snow you are skiing faster and resisting a lot more compression forces in the turns, so the base line load on your knees is greater.
I think, though, that if you are strong enough then your knees never really feel the extra stress because the quads are able to keep the knee in line and the loads never fall on ligaments or cartilage??
Higher speeds or weaker legs make it easier for us to notice the difference, but it is always there (ASSUMING the same skiing -- same speeds and turn radius).
But I
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