Patellar subluxation

Good evening: I was wondering if anyone had a similiar problem or can help with a potential diagnosis. I was diagnosed with a patellar subluxation approximately two months ago. Based on the mri and xrays I was told to rehab it. I am in my third week of rehab and while I have seen a small imrovement, Pain is still persistent. The pain is in the left side of the knee cap in what I suppose to be the retinaculum (sp?) area. there is also a pian in the back of the knee cap. In addition there have been bouts of instability during everyday activities and during rehab. So I am wondering if I may have been misdiagnosed and if any one has a timetable on subluxation recovery time. Thanks.