OK. This is weird. I was just picking up my MRI's to take to OS next week and got a look at the radiologist's report. I hadn't realized that I hadn't seen it before. It said that the screw(s) from the ACL reconst (several years old) might be coming loose and they recommended a bone scan to confirm. Damn. No one told me this! Has anyone had this happen? I have a diagnosis of patella baja but who knows what else might be going on. Does a loose screw cause pain or other problems? I have sooo much pain.