The-definition.com

Definition

Avascular necrosis

Avascular necrosis is cellular death of bone resulting from a temporary or permanent loss of blood supply to that bone.  Avascular necrosis may occur in a variety of medical conditions, some of which have an etiology that is less than clear.

A typical site for avascular necrosis is a fracture across the femoral neck in an elderly patient. In these patients there is loss of continuity of the cortical medullary blood flow with loss of blood flow deep to the retinacular fibers. This essentially renders the femoral head bloodless; it subsequently undergoes sclerosis and collapse. In these patients it is necessary to replace the femoral head with a prosthesis

References
Share it:  Cite

More from this Section

  • Ureteric Stones
    There are three sites of anatomic narrowing of the ureter where stones may be arrested, ...
  • Fascia
    Fascia is connective tissue containing varying amounts of fat that separate, support, ...
  • Mental retardation
    A condition characterized by significant limitations both in intellectual functioning ...
  • Borderline Personality Disorder
    Borderline Personality Disorder is a mental illness marked by a pattern of unstable personal ...
  • Delusion
    Delusion is a belief that is false, fanciful or derived from deception. In psychiatry, ...