This gives me a whole new direction to proceed with Elvis. If I don't have to put him through anything invasive like surgery, I don't want to. I can live with him having a big knee....but I will actively pursue a definite diagnosis/prognosis through my vet and make sure that it's not something that will degenerate over time if left untreated.
Alana, I can't thank you enough!!! I'll definitely keep y'all posted on what I find out!