Inverted Cyclops Lesion without Extension Block: A Case Report and Literature Review

Area of Science:

• Orthopedics
• Sports Medicine
• Knee Surgery

Background:

• The Cyclops lesion, a fibrous proliferation from the anterior cruciate ligament (ACL) graft's tibial insertion, typically causes knee extension blockage.
• Inverted Cyclops lesions, originating from the femoral side of the ACL graft, have been recently described, also usually associated with extension deficits.

Observation:

• An 18-year-old female presented with a painful inverted Cyclops lesion arising from the femoral notch, 20 months post-arthroscopic ACL reconstruction using a hamstring autograft.
• Notably, this lesion did not restrict her knee's range of motion, deviating from the typical presentation.

Findings:

• This case report details a unique instance of a painful inverted Cyclops lesion.
• The lesion's origin from the femoral notch and absence of extension block represent atypical features.

Implications:

• This case expands the understanding of inverted Cyclops lesion presentations and their potential clinical manifestations.
• It underscores the importance of considering atypical presentations in diagnosing ACL reconstruction complications.
• Further research into the pathogenesis and varied clinical outcomes of these lesions is warranted.