Damage to the veins and arteries which can cause ischaemic necrosis.

The end result is hemorrhaging and ischaemic necrosis of tissue/organs.

Then it could undergo ischaemic necrosis, and turn gangrenous.

In your case, a fracture to the scaphoid can restrict its blood supply, causing the bone to die off (ischaemic necrosis).

This impairment of blood supply leads firstly to hyperaemia and congestion, and ultimately to ischaemic necrosis and cellular death.

In septicemia plague, bacterial endotoxins cause disseminated intravascular coagulation (DIC), causing tiny clots throughout the body and possibly ischaemic necrosis (tissue death due to lack of circulation/perfusion to that tissue) from the clots.