Bone Infarct

Topic updated on 03/06/14 7:59pm
  • Overview
    • bone infarcts are often thought to be in the same spectrum of disease as osteonecrosis
    • occurs within the metaphysis or diaphysis of long bone
  • Epidemiology & Incidence
    • similar risk factors as those seen in osteonecrosis
      • trauma, sickle cell disease, connective tissue disorders, Gaucher's disease, steroid use
  • Mechanism
    • interruption of blood supply by intrinsic or extrinsic factors
  • Symptoms
    • usually asymptomatic
      • often found when imaging the extremities for other reasons
  • Radiographs  
    • medullary lesion of sheet-like central lucency surrounded by sclerosis with a serpiginous border  
      • "smoke up the chimney"
  • MRI 
    • key feature is that central signal remains of normal marrow 
    • T1 weighted images
      • peripheral low signal due to grannulation tissue and to lesser extent sclerosis
      • periphery may enhance post gadolinium
    • T2 weighted images
      • acute infarct may show ill-defined non-specific area of high signal
      • intense inner ring of granulation tissue and a hypointense outer ring of sclerosis
  • Bone Scan
    • cold in early phases
    • hot in late resorptive and revascularisation phase
  • Nonoperative
    • observation
      • indications
        • usually asymptomatic and do not require treatment


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Qbank (1 Questions)

(OBQ08.167) A 45-year-old female twists her knee suddenly while playing tennis. She denies any history of knee pain in the past. Radiographs are shown in Figure A. What is the diagnosis? Topic Review Topic
FIGURES: A          

1. Bone infarct
2. Osteonecrosis
3. Metastatic carcinoma
4. Osteosarcoma
5. Enchondroma


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