If bruised they temporarily stop doing their job - that is, to
from the bones
and put a necessary amount into the blood
. It’s the low calcium in the blood that’s the issue.
Prior to surgery I had one parathyroid that was hyper, or overactive, and that caused all sorts of its own bone and blood issues.
There are issues that affect bone calcium, utahmomma lists some, and that’s as much of a concern.