Cyst between Femoral Attachments of Cruciate Ligaments: Unusual Cause of Knee Pain and Review of Literature

INTRODUCTION: Cysts associated with the cruciate ligaments are rare with an incidence of less than 1%. Most are asymptomatic and detected as incidental findings, but some are symptomatic presenting with knee pain and restricted range of motion. Case report. A 33-year-old female presented with pain and restriction of terminal flexion at the knee. No history of trauma was present. Clinically no diagnosis could be established. MRI showed a cyst located between the femoral attachments of cruciate ligaments which was further confirmed by diagnostic arthroscopy. Rupture of the cyst was done arthroscopically. Postoperatively, patient was relieved of the pain. There were no subsequent recurrences. CONCLUSION: Cysts between the cruciate ligaments must be kept as a differential while dealing with a patient of knee pain, with no antecedent history of trauma and where clinically no diagnosis can be made. Arthroscopic excision or rupture has a good success rate with no recurrences.