Tendons don’t show up on xrays.
Tore my achilles tendon, doc needed to do an MRI. Insurance company wouldn’t authorize an MRI without an xray first even though literally everyone else knew they don’t show up on xrays.
At least they didn’t make you do 8-12 weeks of physical therapy first…
That was the thing, I needed the MRI to START physical therapy so they knew exactly where the tear was and to what extent it was torn.
So I limped around in agony for a few extra weeks while the doctors explained how they were, in fact, “doctors” and the insurance company was not.
Is this by any chance from the US?
So, as the other poster said, they are held together by tendons. But what is between the bones?
Protein. Bones are made of mostly collagen, with calcium nodules to act as rigidity-giving bricks. Babies have yet to calcify a lot of their skeleton. It’s only in puberty we finally calcify it all, thus finishing growth.