The cyclops lesion after bicruciate-retaining total knee replacement

Area of Science:

• Orthopedic Surgery
• Sports Medicine
• Biomedical Engineering

Background:

• The cyclops lesion is a common complication after anterior cruciate ligament (ACL) reconstruction, characterized by localized anterior arthrofibrosis.
• It typically forms at the ACL insertion site, causing an extension block due to impingement within the femoral intercondylar notch and tibial plateau.

Observation:

• This report details two cases, involving three knees, where cyclops lesions manifested atypically after bicruciate-retaining total knee replacement (TKR).
• One patient developed lesions in both knees following bilateral TKR, and another occurred in an active sportswoman.

Findings:

• All three observed cyclops lesions, though unusual in this context, were successfully treated with arthroscopic debridement.
• The study highlights the atypical presentation of cyclops lesions post-bicruciate-retaining TKR.

Implications:

• These findings suggest that clinicians should consider cyclops lesions in the differential diagnosis for extension block after bicruciate-retaining TKR.
• Understanding the diagnosis, treatment, and prevention of these atypical lesions is crucial for optimizing patient outcomes after knee replacement surgery.