I am looking for some advice as to what this might be. Or, if you have some personal experience with this, please share!I have been doing martial arts for a number of years and am currently recovering from a knee injury. About 3-4 months ago I was diagnosed with patellofemoral pain, likely due to imbalances of the muscles around both knees. It was hypothesized that the outter structures (IT band, VMO) were tighter and stronger than the inner structures, such as inner quadricep and adductor muscles. After a period of physical therapy, I was released and have been continuing leg conditioning since. Exercises include general strengthening of the quadriceps, hamstrings, hips flexors, and calves, general leg stretching, and foam rolling (myofascial release) of the lateral structures (IT band, VMO). Also, I have been cross training (biking, swimming, jogging, elliptical machines) 1-2 times a week.Leg strength has increased and overall pain has decreased. I can perform all exercises pain-free. However, I now have a cold sensation over both knees during certain activities. These include jogging, prolonged walking, and prolonged sitting. Prolonged sitting also causes some knee pain. The sensation is cold, but certainly not painful…but it is a feeling I have never felt before.Has anyone ever experienced this cold sensation or come across it in their practice? Are there any hypotheses about the cause, implications, and treatment of this cold sensation? In other words, is this normal or is it something I should worry about?Thank you for the help!