Cyclops lesion

A cyclops lesion is a bunched up area of scar tissue in the notch of the femur, usually seen as a complication of anterior cruciate ligament reconstruction.

cyclops lesion after ACL reconstruction cyclops cartoon  
A cyclops lesion filling the notch of the femur anterior to the reconstructed anterior cruciate ligament (ACL). The original cyclops of mythology was a one-eyed monster.  

 

Extension deficit as a result of a cyclops lesion

The bunched up tissue causes problems with achieving full extension. There may be a complete inability to achieve full extension, or it may be possible with an uncomfortable clunk.

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Related Content

Cyclops lesion after ACL Reconstruction

A discussion about problems with regaining extension after ACL reconstruction because of a Cyclops Lesion.

Complications of cruciate reconstruction

Important information to read.

ACL graft failure due to graft impingement

ACL reconstruction failure and revisions - Part 5b - by Dr Frank Noyes.

2000 - Results of Arthroscopic Treatment of Symptomatic Loss of Extension Following Anterior Cruciate Ligament Reconstruction

An 'interpretation'of an article from 2000 describing the possible causes of loss of full extension in the knee after cruciate ligament reconstruction, how it is managed, and highlighting the importance of rehabilitation in preventing loss of full range of movement in the first place.

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CLINICAL PUBLICATIONS

Case Series: Cyclops lesion - extension loss after ACL reconstruction. Dhanda S, Sanghvi D and Pardiwala D. Indian J Radiol Imaging. 2010 Aug; 20(3): 208–210.

The cyclops lesion after bicruciate-retaining total knee replacement. Klaassen MA and Aikins JL. Arthroplast Today. 2017 Dec; 3(4): 242–246.

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