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Both at the same time, long term compression wears down the nodules (the stuff covering the bones to prevent bone on bone contact in joints) so.

Source: My Orthodontist after looking at my right knee (nodules) and left one (ligaments and torsion / compression at the same time)

Edit: Orthopedist, not dentist! What was I thinking!

> "the stuff covering the bones to prevent bone on bone contact in joints"

that's a meniscus, and coats the articulating surfaces (called condyles). synovial fluid in the joint capsule acts as a lubricant for the menisci.

a nodule is a lump.

I'm curious why your orthodontist was looking at your knees in the first place...

Back when I had one of those -dontists, my knees were still good!