I can see that the slide #11 had sign of osteonecrosis (empty lacunae). It will be necessary to show the subchondral bone collapse to diagnose avascular necrosis, or the "naked" joint surface to diagnose osteoarthritis with secondary osteonecrosis.
I can see that the slide #11 had sign of osteonecrosis (empty lacunae). It will be necessary to show the subchondral bone collapse to diagnose avascular necrosis, or the "naked" joint surface to diagnose osteoarthritis with secondary osteonecrosis.