...and now for the rest of the story...
Met with the ortho yesterday to review the knee MRI results. No meniscus tear! There is a stress fracture at the top of the tibia and stretched ligaments bilaterally and on the back of the knee. It'll ache for a few months but will eventually heal without surgery. Not my first stress fracture so I kind of have an idea what to expect for recovery.
Still, I was kind of surprised to find out about the two other previous, long-ago-healed fractures in my tibias.