The 13,900-Year-Old Mastodon Rib Found With A Bone Point Still Inside — And The CT Scan That Put Hunters Before Clovis
The rest of the weapon behind the tip is under tension as it transmits force forward; the tip itself is under compression as it drives into the bone.
If the tip material is hard but brittle — and dense bone is both hard and brittle — the result of a direct bone-to-bone impact is fracture: the tip shatters into fragments that remain in the wound channel while the shaft of the weapon, being behind the impact and under different stress conditions, separates from the tip and may be pulled free.
Hunters who have used bone-tipped weapons — historically and in the present — describe exactly this phenomenon.
The bone tip breaks off in the wound.