โœ… Knee MRI Mastery/Chap 5E. Other

(Fig 5-E.13) Lipohemarthrosis and Intra-Articular Gas

MSK MRI 2024. 8. 4. 22:54

https://youtu.be/quOCphxv3Ic

 

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๐Ÿ“ŒLipohemarthrosis

 

โœ…Cause and Association 

  • Lipohemarthrosis results from an intra-articular fracture with leakage of fat and blood from the bone marrow into the joint space. 
  • It is most frequently observed in the knee and is associated with tibial plateau fracture. 

โœ… Earliest Findings 

  • The earliest findings of lipohemarthrosis include the presence of several fluid-fluid levels with entrapment of globules of fat. 
  • The classic double fluid level can be expected several hours after injury. 

๐Ÿ“ŒHemarthrosis

  • Hemarthrosis most often occurs due to trauma but can also be seen with bleeding disorders and coagulopathy.

 

โœ… Imaging Characteristics 

  • Subacute blood products (e.g., methemoglobin) are intrinsically T1 hyperintense and often T2 hyperintense depending on the chronicity of the hemorrhage. 

๐Ÿ“ŒIntra-articular Gas

โœ… Susceptibility Effects 

  • Intra-articular gas can be identified by the susceptibility effects of air bubbles, which appear as focal rounded hypointense areas with adjacent thin hyperintense rims.

 

References

  1. Semin Musculoskelet Radiol 2009;13:303โ€“325.
  2. Radiographics. 2023 May;43(5)
    .

 

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#Radiology, #Lipohemarthrosis, #Hemarthrosis, #IntraArticularGas, #MRI, #Musculoskeletal, #KneeInjuries, #TibialPlateauFracture, #TraumaImaging,