It seems that something has already be done in this location. Those giant cells and inflammatory changes seem to be reacting to some foreign material. A clinical history will be important. To diagnose avascular osteonecrosis, it is better to view the gross or macroscopic pictures of the sub-chondral bone collapse or wedge shaped necrosis.  

 描述一下，最后符合无菌性坏死。

符合股骨头坏死后改变

股骨头坏死，炎症反应，多核巨细胞反应。