Avascular necrosis (AVN), also called osteonecrosis, aseptic necrosis
or ischemic bone necrosis, is a very painful and challenging condition that occurs when there is loss of blood to the bone.
Therewith open reduction and internal fixation of acetabular fragments are often accompanied by aseptic necrosis
of the femoral head or acetabulum, post-traumatic osteoarthritis, heterotopic ossification, metal structures breakage, iatrogenic injury of the sciatic nerve and blood vessels, high risk of thromboembolic complications.
The differential diagnosis of ear canal cholesteatoma includes malignant tumor, aseptic necrosis
, and malignant otitis externa.
Legg-Perthes disease (also known as Legg-Calve-Perthes disease, aseptic necrosis
of the femoral head, Perthes disease, or Legg's disease) is a congenital condition that has no known cause.
Although systemic manifestations of this syndrome may include polyserositis, mental status changes, medullary fat necrosis of long bones and aseptic necrosis
of the bones were less frequently observed (1, 4, 7).