EURORAD ESR

Case 10959

Lipohaemarthrosis in knee fracture: the FBI sign

Author(s)
Matteo Revelli, Davide Orlandi

University of Genova,
School of Radiology
 
Patient
female, 74 year(s)
 
 
  • Figure 1
    Plain radiograph
     

    Antero-posterior (AP) plain radiographic examination of the left knee, showing a cortical disruption on the medial femoral condyle (arrow).

     
    Area of Interest: Musculoskeletal system; Imaging Technique: Plain radiographic studies; Procedure: Diagnostic procedure; Special Focus: Trauma;

    Latero-lateral (LL) plain radiographic examination of the left knee, revealing a level in the suprapatellar pouch (arrow), in keeping with a fat/blood interface.

     
    Area of Interest: Musculoskeletal system; Imaging Technique: Plain radiographic studies; Procedure: Diagnostic procedure; Special Focus: Trauma;
     
     
  • Figure 2
    CT
     

    CT axial image of the left knee with bone window, showing a cortical interruption on the medial side of the distal femur (arrow).

     
    Area of Interest: Musculoskeletal system; Imaging Technique: CT; Procedure: Diagnostic procedure; Special Focus: Trauma;

    CT coronal reformatted image of the left knee with bone window, confirming the fracture of the medial femural condyle (arrow).

     
    Area of Interest: Musculoskeletal system; Imaging Technique: CT; Procedure: Diagnostic procedure; Special Focus: Trauma;

    CT axial image with soft tissue window, showing FBI sign with three different layers: a fat level on the top (^), a serum/synovial fluid level on the middle (~) and a blood layer on the bottom (*).

     
    Area of Interest: Musculoskeletal system; Imaging Technique: CT; Procedure: Diagnostic procedure; Special Focus: Trauma;
     
     
  • Figure 3
    Drawing

    Drawing representing the double fluid/fluid level (black/red interface) in case of a prominent suprapatellar plica (in green). Legend: f: femur; p: patella; t: tibia.

     
    Area of Interest: Musculoskeletal system; Imaging Technique: Image manipulation / Reconstruction; Procedure: Education; Special Focus: Trauma;
     
     
Antero-posterior (AP) plain radiographic examination of the left knee, showing a cortical disruption on the medial femoral condyle (arrow).
 
Latero-lateral (LL) plain radiographic examination of the left knee, revealing a level in the suprapatellar pouch (arrow), in keeping with a fat/blood interface.
 
CT axial image of the left knee with bone window, showing a cortical interruption on the medial side of the distal femur (arrow).
 
CT coronal reformatted image of the left knee with bone window, confirming the fracture of the medial femural condyle (arrow).
 
CT axial image with soft tissue window, showing FBI sign with three different layers: a fat level on the top (^), a serum/synovial fluid level on the middle (~) and a blood layer on the bottom (*).
 
Drawing representing the double fluid/fluid level (black/red interface) in case of a prominent suprapatellar plica (in green). Legend: f: femur; p: patella; t: tibia.
 
 
 
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