Fascinating evolution of bone.
It has evolved to be just strong enough it deliberately breaks before tendons and muscles break. In any force is about to be sufficient to detach a muscle, then the bone deliberately breaks to relieve (shorten) the distance the muscle has to stretch. Muscle as it involves proteins must be healed purely from the cell nucleus, which is a fixed speed per cell. A damaged muscle has a minimum duration to heal proportional to the length of the fibers.
Bone however is not made up of cells (approximately), so there is no minimum healing time, so it can heal quicker. So nature has evolved our bones to be strong enough to handle normal loads, but to break for abnormal loads, so the more complex slower healing muscle is protected from snapping.
In space, as our muscles have to do less work, our bones do also, and you see our evolutionary advantage weakening our bones to keep them just weaker than our weakening muscles.
Your whole body’s bone healing capacity is applied to the broken bone, something a muscle cannot do as it is only the fiber’s own nucleaus can repair the fiber.
I’m afraid I find things interesting.
