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Review Question - QID 7010

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QID 7010 (Type "7010" in App Search)
A 77-year-old man with a history of mild renal insufficiency and atrial fibrillation on warfarin therapy is scheduled to undergo a left total hip arthroplasty. He previously underwent a right total hip arthroplasty with development of significant heterotopic bone that resulted in limitation of motion. What is the most appropriate form of prophylactic treatment to minimize the formation of heterotopic bone on his left hip?

Postoperative indomethacin for 3 weeks

9%

45/522

Postoperative indomethacin for 6 weeks

17%

89/522

No treatment indicated; can treat later if heterotopic bone forms

5%

26/522

800 centigrey of radiation given to the periprosthetic soft tissues preoperatively on the morning of surgery

46%

241/522

400 centigrey of radiation given to the periprosthetic soft tissues day 2 postoperatively

23%

118/522

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This question centers on the prophylactic treatment to reduce the risk of heterotopic bone formation. Prophylaxis is indicated because he has already demonstrated bone formation with his prior hip arthroplasty, which places him at increased risk for developing heterotopic bone on the contralateral side. He is on warfarin and has renal insufficiency, which makes the use of NSAIDs contraindicated. The recommended dose is 600 to 800 centigrey of radiation given within 24 hours of surgery preoperatively or 72 hours postoperatively.

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