(Fig 3-A.53) MCL Bursitis ⎜Distinguishing from Grade I MCL Injury

https://youtu.be/YI6RTE_YrMw

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✅ Anatomy of the MCL Bursa

• Located between superficial and deep portions of the MCL along the middle third of the knee joint
• May be single or multi-compartment

✅Imaging Findings of MCL Bursitis

• Well-defined fluid collection
• May extend into femoral/tibial compartments adjacent to cortex
• Anterior margin adjacent to MCL
• Posterior margin at MCL-deep capsular ligament junction
• Fine septations within bursal fluid
• Can communicate with semimembranosus-tibial bursa

 

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✅Distinguishing MCL Bursitis from Grade I MCL Injury

★ Grade I MCL Injury

• High signal edema outlining the superficial medial collateral ligament (MCL) without ligamentous disruption

★ MCL Bursitis

• Fluid-filled lesion between superficial and deep MCL
• Normal MCL thickness and signal intensity
• No surrounding edema

 

Semin Musculoskelet Radiol. 2016 Feb;20(1):12-25.

Emerg Radiol (2012) 19:489–498

MRI Web Clinic - June 2018 Medial Supporting Structures of the Knee with Emphasis on the Medial Collateral Ligament 

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