(Fig 4-C.07) Peri-cruciate Fat Pad Inflammation

https://youtu.be/xdurrvlw_V0

https://youtu.be/EiNzQqJbmYs

 

 

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📌Peri-cruciate Fat Pad Inflammation

• Peri-cruciate fat pad inflammation commonly presents as non-specific posterior knee pain, particularly in young individuals with high physical activity levels. 
• This condition is often associated with the impingement of the fat pad during knee flexion and is considered an exclusion diagnosis.

 

✅MRI Findings:

• Poorly defined edema in the peri-cruciate fat pad on fluid-sensitive fat-suppressed sequences.
• Best appreciated on sagittal and axial images.
• The edematous fat pad enhances following contrast administration.

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📌Adhesive Capsulitis of the Knee

• Adhesive capsulitis of the knee involves a combination of synovial inflammation and capsular fibrosis. 
• The disease progresses from synovial inflammation to fibroblastic infiltration, leading to adhesion and retraction of the capsule. 
• Typically, pain presents first, followed by a progressive loss of motion; the pain then subsides, and motion may or may not be slowly restored .

 

✅ MRI Findings:

• High signal intensity on fluid-sensitive images.
• Contrast enhancement of the pericapsular tissues, especially around the anterior cruciate ligament, popliteal tendon insertion, and posteromedial and lateral capsule.
• Quadriceps fat pad involvement, with signal abnormalities most likely representing edema. 
• This overlap suggests that isolated suprapatellar fat pad signal alteration may be a forme fruste ( incomplete phenotypic expression of a condition, such that it does not meet the usual diagnostic criteria.) of adhesive capsulitis.

 

References

1. Skeletal Radiology (2020) 49:823–836
2. Magn Reson Imaging Clin N Am 22 (2014) 725–741

 

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