Clinical and operative characteristics of cyclops syndrome after double-bundle anterior cruciate ligament reconstruction.

Purpose: The purpose of this study was to investigate the clinical and operative characteristics of cyclops lesion in a consecutive series of patients with anterior cruciate ligament (ACL) double-bundle reconstruction.

Methods: Included were 387 patients who underwent an ACL double-bundle reconstruction with quadriceps or hamstring tendons and were followed up at 6 weeks and 3, 6, and 12 months for clinical examination. When a persistent extension deficit was observed 3 months postoperatively, magnetic resonance imaging was performed to eventually diagnose a cyclops syndrome, and arthroscopic removal of the nodule was performed in these cases.