Hesperis, To go back to the idea of Occam's Razor.

Can you understand how someone else, with a different bent for explanation, might think that

you might have applied your feelings of what was going on with your joint to the anatomical knowledge you had picked up; a basic understanding that the structure of the knee joint involves cartilidge where the bones come together?

you might have been subconsciously aware that asprin causes bleeding which is one of the advantages of acetominophin, it doesnt. It is why aspirin are buffered. Many would feel that this knowledge is not restricted to the medical specialties?

Do you think someone without a knowledge of the rough outline of how a knee joint is constructed would have felt the same way you did?

For me, it seems less of a stretch to go that route for an explanation than to invoke ideas that have never been confirmed under controlled circumstances.

Sourdough