Hemorrhagic Cyclops Syndrome after Anterior Cruciate Ligament Reconstruction - A Rare Cause of Recurrent Hemarthrosis: About Two Cases and Review of the Literature.

Introduction: Cyclops syndrome is a classic complication after anterior cruciate ligament (ACL) reconstruction and usually manifests as an extension deficit. A presentation dominated by recurrent hemarthrosis has never been reported.

Case Report: We report the cases of two patients who underwent ACL hamstring reconstruction and whose post-operative recurrent hemarthrosis revealed the presence of a cyclops syndrome typical lesion.

Conclusion: Theses atypical presentations of cyclops syndrome should alert surgeons that post-operative hemarthrosis after ACL reconstruction may reveal fibrous nodule at the tibial insertion of the graft by a cyclops lesion and that a puncture should be performed to bring back hemorrhagic fluid. It is imperative that treatment should include coagulation of this hypervascularization to avoid any recurrence.