(Fig 4-C.14) Medial Synovial Fold of the PCL

https://youtu.be/UjTqbJmheoI

https://youtu.be/EiNzQqJbmYs

 

 

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📌 Medial Synovial Fold of the PCL

 

• The medial synovial fold of the posterior cruciate ligament (PCL) is a normal anatomical variant that can occasionally produce symptoms. 
• This fold can be classified into three types based on its morphology and potential for causing impingement.

 

✅ Classification of Medial Synovial Folds

1️⃣ Type A

• No definite medial synovial fold.
• Least likely to cause issues.

 

2️⃣ Type B (Inferior-Short Type)

• Small synovial protrusion at the medial border.
• Generally short, less likely to cause impingement or symptoms.

 

3️⃣ Type C (Inferior-Long Type)

• Longer fold extending beyond an imaginary line from the medial tibial spine to the posterolateral aspect of the medial femoral condyle.
• Significantly associated with PCL impingement and symptoms.

✅ Clinical Implications

• While PCL synovial folds are generally normal structures, they can sometimes cause pain if they become entrapped. 
• This condition may necessitate surgical excision to alleviate the symptoms. 
• In cases of vague, unexplained knee pain, careful observation of the PCL fold on MRI is crucial to identify any potential issues.

References

1. J Comput Assist. Sep-Oct 2016;40(5):799-802
2. Arthrosc Orthop Sports Med 2020;7:12-15

 

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