Initiating vs. contributing causes of osteonecrosis

Hello, dear readers! Welcome to the monthly letters column. You have been sending us some very interesting mail, so we will dive right in.

– We recently wrote about osteonecrosis, a condition in which a decrease or loss of blood supply causes bone tissue to die. It occurs most often in the hip, but it is also seen in the knee, ankle, wrist and shoulder.

A reader in Ohio has asked for more informatio…