I had bilateral knee replacements in august 2016. PT was successful. Moved to florida in November. About February, started getting pains in right knee. Happens when bearing weight on leg for 1 minute, or when sitting in bed with ankles crossed. Getting increasingly worse, but only lasts a few minutes to a few hours. Started PT again but no one knows why this happens. Xray was normal - no damage to implant. Feels similar to shin splint but it is on outside of lower leg, sometimes in calf too, and sometimes immediately under the kneecap. I also developed Afib in December and take metroprolol 25 mg daily. Could this be exertional compartment syndrome? Or a blood clot?