Hallelujah! Today my knee feels perfectly fine. Not only can I walk normally, I manage stairs without strain, pain, or difficulty.
The pop and pain from two weeks ago may be gone, but I don’t dare to assume the problem won’t return. The improvement could be a temporary, cumulative effect from the NSAID I’m taking.
Tomorrow morning, a physical therapist will evaluate my knee. Once I know where I stand, literally, with this injury, I’ll be able to judge whether or not a return to running will be possible.