My pain started the very same way. I thought it was a patella strain, so I got a patella strap, might have helped a little. the pain persisted, especially at night, so I went to see Dr. He sent me to orthopedic surgeon. After x-rays, I was told I needed knew knee. He told me, the pain I was experiencing was quit normal when the knee is shot. the knee pain radiates out from the joint itself.I had no other pain in knee other than what I mentioned, none. About a week before knee replacement surgery my knee started to swell up, which Icing helped. I now have new knee. I'm one of the lucky ones, very little post surgery pain, I took no pain meds. other than Aleve. It's been five weeks tomorrow since surgery. I am gettin most of my range of movement back. The outside of my knee is numb and the inside stings a lot, all normal so I'm told. The biggest issue right now is sitting in a chair or in a vehicle causes lots of discomfort, so a recliner it is.