Pain... just kidding, everyone on this page knows the word pain..
a lot of popping in the front, kind of like going over an eccentric cam if that makes any sense. Pictures on that bone/joint link I had above show it quite well. When it pops it irritates something in there so you end up with a feeling like something is chafing because it becomes sore and tender, sometimes feels like ground hamburger and you just don't want to get out of the chair unless its for a shot of tequila and a pain pill (just kidding-not). There are many sources of popping, one is the post on the Tibial plateau implant, my understanding is that is what keeps your knee from going backwards to far and when it hits the back it will pop. At least that is what my doc tells me. He says you may have that the rest of your life. Not sure I buy that explanation. I'm leaning more towards the explanations in that link above
To see if it is your patella out of place you can do one of two things. I suggest having your doc do an x-0ray with your knee bent looking from the front of the knee. Then you see what I have on my x-ray in the previous post. I also found that making sure your kneecap floats is number one, I suggest a licensed physical therapist for this one. Especially if its your first rodeo. I have lots of movement up & down but not so much sideways. I found that when riding a recumbent bike with the pedals such that my knee bends at least 90 degrees in a stroke that if I GENTLY nudge the patella over and the the clicking on the patella goes away. That was my first clue something was not right. Then I went and got the x-ray from my surgeon. You have to be EXTRA careful here, as too much pressure when moving the patella to the side because you could dislocate your patella if it was not out. Take a look at some Youtube vids on Patella mobilization exercises/therapies.
By the way, make sure you have VERY sturdy shoes-so your ankle does not move and your foot hits straight (not angled from pronation or supination-I supinate on my right foot, new knee is left leg). I'm a big guy (300 Lbs) and if I don't have a shoe with a "Limited Motion design" such as the Xelero shoes my ankle moves and screws the whole thing up. Hurts ankles, knees and hips. Also, if your hips are hurting check to see if your legs are the same height. Both knees on me need to be done. Both bone on bone. Low an behold after the operation my new knee leg is 3/8" taller (because they replaced cartilage in guess-that is the approximate thickness of the Tibial plateau insert). Anyway, put a 3/4" wedge in the right shoe and now I walk straight (really-go figure).
My surgeon thinks I am asking for too much too soon. But I don't necessarily agree, but I am keeping an open mind. I have done all the exercises and stretching and have full extension and 120 deg rotation but I can't walk more that 200 yards before giving up. I had no clue what was holding me back but now that I am working on this (patella orientation) it seems like the only thing left is building strength and endurance.
By the way I also just ordered a support made specifically to help the patella track after an injury of surgery. Should be interesting to see what happens. I get it in a couple days. Can't wait !!! "Patella Stabilizing Chondromalacia Knee Brace | U-Shaped Support Sleeve for Inner & Outer Kneecap Pain" on amazon. Made specifically for a big folks so it fits correctly on my ham hock size of a leg
Today I just walked a mile and could have done 3. No swelling, no pain. Imagine that. Put the kneecap in place and it works!!! I still have a click/pop but the more I walk that more that fades. I take that as the muscles toning up and the Kinesio tape keeping the patella in a better location (not perfect, but close).
OK, hope that helps, that's my 2 cents. Cheers everyone. Listen to your body, it's your body and no one else knows it like you do. Steve A.KA. Ricardo when in Mexico ;) Facebook: S/v Elektra