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A professional fit session and modifying your riding style to a higher cadence would definitely help. If you have around $100 to spare, it is worth a shot.
Given the fact that your knee has been injured in the past, however, I would definitely recommend going to a sports practice doctor that specializes (or at least understands) cycling-related knee issues to get checked out if the fit session doesn't help. Some knee problems will not go away without medical help no matter how much you tinker with the fit of your bike or your riding style.
I had pretty severe knee pain last year whenever I went over 50 miles. A professional fitting session and cleat adjustment (for clipless shoes and pedals) definitely helped a bit, but the pain still didn't go away. I eventually went to a sports doc, had the real problem diagnosed, and went on a rehab program. My problem was weak hip flexors and core strength that caused my right knee to track incorrectly--an issue that would not have been resolved without learning specific stretches and exercises to fix the problem. Simply put, I had somehting very similar to runners' knee based on an imbalance between my leg strength and my hip flexor strength.
Athletico, which is one of the bigger physical therapy parctice groups in Chicago, does free sports injury screening at many of its locations. If Athletico finds a problem, they are pretty good about hooking you up with a sports doc that specializes in the type of injury you have.
Joe Stein knows his stuff.
Especially the slightly different length bit. I gather that is more of a common problem than one might initially expect. You seem to correlate the knee issue as only happening when you ride---as opposed to noticing pain from multiple, differing activities.
If you are overstraining your injured knee, you might reduce your gear ratio. High ratio's (read: big, hard gears) are great at building strength but not especially efficient. They can also really strain your knees. Crank length is another area on a bike that can not only affect your riding style (comfortable cadence), but also cause knee pain. A good bike fit could address these issues as well as more personal riding traits which might contribute.
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