EURORAD ESR

Case 9401

Focal herniation of Hoffa’s fat pad through a retinaculum defect

Author(s)
Diogo Rocha 1, Rui Ramos 2, José Campos 1, Daniela Pinto 1, Madalena Pimenta 1

1) Radiology Department, Hospital São João, Porto, Portugal
2) Radiology Department, Hospital Distrital de Santarém, Portugal
 
Patient
male, 14 year(s)
 
 
  • Figure 1
    Knee flexion - Ultrasound

    Longitudinal view of the lateral knee in flexion showing herniation of Hoffa’s pad (yellow star) through a focal defect in the lateral retinaculum (white arrows)

     
    Area of Interest: Musculoskeletal soft tissue; Imaging Technique: Ultrasound; Special Focus: Hernia;
     
     
  • Figure 2
    Knee extension - Ultrasound

    Longitudinal view of the lateral knee in extension showing a smaller herniation of Hoffa's fat pad (yellow star).

     
    Area of Interest: Musculoskeletal soft tissue; Imaging Technique: Ultrasound; Special Focus: Hernia;
     
     
  • Figure 3
    Knee anatomy - Parasagittal T1 weighted MRI.

    Knee anatomy. Parasagittal T1 weighted MR centered in the anterolateral aspect of the infrapatellar region.

     
    Area of Interest: Anatomy; Imaging Technique: MR;
     
     
  • Figure 4
    Knee flexion - Parasagittal T1 weighted MRI.

    MR T1 weighted image. As the knee bends the images depict a progressive disruption of the fibres of the retinaculum with subsequent herniation of Hoffa's fat pad (yellow arrow).

     
    Area of Interest: Musculoskeletal soft tissue; Imaging Technique: MR; Special Focus: Hernia;
     
     
  • Figure 5
    Knee extension - Parasagittal T1 weighted MRI.

    MR T1 weighted image. During knee progressive extension the defect of the retinaculum becomes smaller and herniation of Hoffa's fat pad almost disappears. The yellow arrow indicates the fat pad herniation.

     
    Area of Interest: Musculoskeletal soft tissue; Imaging Technique: MR; Special Focus: Hernia;
     
     
Longitudinal view of the lateral knee in flexion showing herniation of Hoffa’s pad (yellow star) through a focal defect in the lateral retinaculum (white arrows)
 
Longitudinal view of the lateral knee in extension showing a smaller herniation of Hoffa's fat pad (yellow star).
 
Knee anatomy. Parasagittal T1 weighted MR centered in the anterolateral aspect of the infrapatellar region.
 
MR T1 weighted image. As the knee bends the images depict a progressive disruption of the fibres of the retinaculum with subsequent herniation of Hoffa's fat pad (yellow arrow).
 
MR T1 weighted image. During knee progressive extension the defect of the retinaculum becomes smaller and herniation of Hoffa's fat pad almost disappears. The yellow arrow indicates the fat pad herniation.
 
 
 
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