I searched through the questions but did not see the problem I am experiencing. I broke my leg in December 2013 and did not require surgery. After 8 weeks I started PWB but experienced my patella not tracking correctly and my knee would lock. They did an MRI and found that, even though the xray showed it healed, that it was still not healed. I was pulled off of PWB and have used a bone stimulator. I am supposed to start PWB again after 2 months with the stimulator are complete. My problem is my knee still pops with almost every flexion and becomes sore. I do PT for about 1.5 hours a day and more at times. My MD said it was most likely it was related to muscle imbalance. Has anyone experienced this and what did you do to over come this problem. I am a nurse and need to get back to work!