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Review Question - QID 173

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QID 173 (Type "173" in App Search)
A 79-year-old female falls onto her right hip at home and sustains the injury shown in Figure A. She undergoes an uncemented unipolar hemiarthroplasty. During insertion of the stem into the femoral canal, the patient becomes hypotensive and hypoxic. Which of the following has most likely occurred?
  • A

Femoral shaft fracture

0%

9/3769

Inadequate fluid resuscitation during surgery

1%

27/3769

Acute myocardial infarction

1%

32/3769

Pulmonary embolism caused by dislodging of deep venous thrombosis during hip exposure

3%

95/3769

Intramedullary fat and marrow embolization

95%

3589/3769

  • A

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During insertion of the femoral stem, the intramedullary pressures are increased. Fat and marrow elements can become embolized into the bloodstream at this point resulting in ventilation perfusion mismatch in the lungs.

Kim et al prospectively followed 156 total hip arthroplasties including bilateral and unilateral procedures as well as cemented and uncemented procedures. They found no difference in fat embolization amongst any of the groups. However, they did find that if patients had evidence of bone marrow cells in the right atrium on the first postoperative day, they developed diffuse encephalopathy with confusion and agitation that lasted for about twenty-four hours.

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