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J Pediatr Orthop B. 2014 Jan 8. [Epub ahead of print]

A case report: locking because of cyclops syndrome occurring after partial rupture of the anterior cruciate ligament.

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  • 1aDepartment of Orthopedic Surgery, Ehime Seikyo Hospital bDepartment of Orthopedics, Tsubasa Clinic, Matsuyama cDepartment of Bone and Joint Surgery, Ehime University Graduate School of Medicine, Toon, Ehime, Japan.


There have been a few reports of cyclops syndrome following a partial rupture of the anterior cruciate ligament (ACL) without surgical reconstruction. We have reported for the first time a case of cyclops lesion with locking symptoms after partial rupture of the ACL. A 14-year-old girl twisted her right knee when landing after a jump while playing basketball, and locking symptoms of the knee appeared. Cyclops syndrome occurred because of a partial rupture of the posterolateral bundle of the ACL was diagnosed and removed as a lump by punch. After resection of the lesion, the locking symptom was no longer observed.

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