What properties of bone prevented matt from breaks and damage to internal organs?

The adaptability of the bones and the quality from calcium. By Matt being oblivious he could unwind his muscles, which enabled them to ingest the stun of the fall/arrival. The mineral part is made out of hydroxyapatite, which is an insoluble salt of calcium and phosphorus. Around 65% of the grown-up bone mass is hydroxyapatite.