Avascular necrosis (AVN), also called osteonecrosis or bone infarction, is death of bone tissue due to interruption of the blood supply.
https://en.wikipedia.org/wiki/Avascular_necrosis
I knew a male dance student who had a dead toe or toes when he took ballet
Ballet was not his dance specialty I think but he had to take it for his degree
Imagine standing on your tip toes on dead toes