My right knee is a bit of a problem and has been for some time . I have a bubble of fluid from an irritated bursa that looks like an extra knee cap and I have had it drained many times and it just keeps coming back so I just leave it. The Ortho guy says it is caused by irritation somewhere and it could be dealt with surgically but no guarantees , it could still come back. Recently when I do my fast walking in the morning I feel a bit of pain right under the knee cap . This is only when I am walking , never when riding. I did 40 miles on Sunday with no pain at all. I have a virtual Dr.'s visit Friday and I will mention it. I need to get my 3 month blood panel done for an existing health issue that is not related. I have been putting off the whole surgery thing for a few years and I think he will probably recommend a visit to the orthropod. Maybe an MRI or something, the last one showed nothing and the meniscus was actually good for my age (65). I have always been on the thin side 6' 1" and 155 lbs. and I don't run , ever! I just ride my bike about 50 miles a week. I take ibuprofen when life throws me aches or pain, the stuff is great . Fortunately I don't have to take it very often. Joe