Osteonecrosis/avascular necrosis MCQ 7+

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• Regarding avascular necrosis of the femoral head
  ক

  Steroid and alcohol induce predisposing factor

  খ

  Early diagnosis by MRI

  গ

  Joint replacement surgery is the choice of treatment

  ঘ

  Most commonly occur in children

  ঙ

  Anorexia weight loss and fever are early features
• Avascular necrosis of bone
  ক

  May be caused by steroid therapy

  খ

  May be caused by irradiation

  গ

  May be caused by trauma

  ঘ

  Another term is bone infarct

  ঙ

  May be caused by prolonged weightlessness
• Common bones affected in AVN
  ক

  Lunate

  খ

  Scaphoid

  গ

  Tarsal navicular

  ঘ

  Metatarsal head

  ঙ

  Greater wing of sphenoid
• Avascular necrosis occurs in the following bones
  ক

  Talus

  খ

  Scaphoid

  গ

  Head of the femur

  ঘ

  Calcaneus

  ঙ

  Pisiform
• Bones that are vulnerable to avascular necrosis following trauma are
  ক

  Head of the femur

  খ

  Head of the humerus

  গ

  Scaphoid

  ঘ

  Talus

  ঙ

  Calcaneus
• Traumatic avascular necrosis occurs in
  ক

  Head of the femur

  খ

  Scaphoid

  গ

  Tarsal bone

  ঘ

  Condyle of the mandible

  ঙ

  Medial malleolus