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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.
📌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
- Skeletal Radiology (2020) 49:823–836
- Magn Reson Imaging Clin N Am 22 (2014) 725–741
"Visualizing MSK Radiology: A Practical Guide to Radiology Mastery"
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#PeriCruciateFatPadInflammation, #PosteriorKneePain, #YoungAthletes, #KneeFlexion, #DiagnosisOfExclusion, #MRI, #Oedema, #AdhesiveCapsulitis, #SynovialInflammation, #CapsularFibrosis
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