(Fig 3-B.07) Mild Proximal LCL Injury

https://youtu.be/F4ygtkuoNzw

https://youtu.be/6WOItzqJj1g

 

🧐 Case Presentation

• Focal hyperintense area and mild swelling at the insertion of the lateral collateral ligament
• Suggestive of mild injury of the proximal lateral collateral ligament (LCL)

 

✅ Point 1: Less Edema and Hemorrhage in LCL Injuries

• In LCL injuries, edema and hemorrhage are less frequent compared to medial injuries involving the medial collateral ligament (MCL)
• Even a grade 1 MCL injury, characterized by subcutaneous edema adjacent to an intact MCL, can demonstrate more surrounding soft tissue edema than an LCL injury
• In a grade 2 MCL injury, there is proximal MCL intraligamentous hyperintensity and thickening due to a partial tear of the superficial fibers

 

✅Point 2: Increased Signal in Proximal LCL

• The proximal LCL can sometimes show increased signal intensity
• This increased signal could be mistaken for a partial tear
• However, it may correspond to normal connective tissue mucin, especially in cases without a clear trauma history
• This possibility should be considered when interpreting such findings

 

Stoller's Orthopaedics and Sports Medicine: The Knee

J Ultrasound Med. 2022 Apr;41(4):827-834

 

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