I have been non-weight bearing since my op just 3 weeks ago and up until now was pleased with progress on both of my knees. Suddenly over the last couple of days my left knee has been giving way and both have been making awful cracking sounds making others around me feel nauseus (let alone myself). Both knees also swell when "cracking" occurs. Am also experiencing a sharp digging pain to the inner side of my right knee which was not there before. No follow up Physio booked until another 2 weeks so keen to get feedback from others who have gone through this. Re-assurances needed, PLEASE !!!