Knee arthroplasty in patient with a giant medial meniscal cyst: case report

Giant meniscal cysts are quite rare. Clinical manifestations of the medial meniscal cyst are frequently either asymptomatic or with a mild pain. The most reliable diagnostic method is magnetic resonance imaging (MRI) or computed tomography (CT). Single cases of observation and surgical treatment of giant cysts were reported in the literature. Long course of the disease leads to degenerative changes in the knee and development of osteoarthritis. The article presents an outcome of successful treatment of a patient with grade III knee osteoarthritis and a giant medial meniscal cyst. The formation gradually grew in the knee area for 9 years. The dimension of the cyst was over 11 cm in diameter. The surgical treatment which included the excision of the meniscal cyst followed by knee arthroplasty provided a good clinical result.