thanks ralph,
I had 2 meniscus surgeries, then the 3rd tear, I felt it happen, same knee, when I picked that 80 lb amp up from a lower shelf.
They had a look, said considering two prior surgeries, they wern't so sure what they were looking at. Try rehab. I did, didn't work, I sleep with a pillow between the knees, I may have someone else have a look.