I hope everything is getting better for you, but my understanding is that a LR is not recommended for a patella that subluxes. A LR alone is usually recommended for a patella tilt only - I have a subluxing patella with tilt, I ended up with a VMO advancement and LR. Many end up with a TTT and LR. The damage to the back of the patella is due to the damage that occurs due to the subliuxing.
Call your OS immediately. My OS was very honest and said that if this surgery didn't prevent the subluxing that I may have to have a TTT. I am only 6 weeks post-op and still don't have any more than 80 degrees ROM while we let the VMO heal. I hope (fingers crossed) that I don't have to have additioanal surgery. At my age, 48 I may just go ahead with the TKR instead if that happens.
Are you doing PT? You could ask them for help as well.