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Cysts of the medial meniscus. Arthroscopic diagnosis and management



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Abstract

We report the clinical and arthroscopic findings in 20 cases of medial meniscal cyst with a mean follow-up of 20 months. These were studied prospectively from a series of 7435 knee arthroscopies in which there were 1246 stable non-arthritic knees with medial meniscal tears. The diagnosis on referral was incorrect in seven, and incomplete in seven. There was coexistent meniscal injury in 17 (85%), but in the other three no tear was visible at arthroscopy. Ten knees had additional intra-articular abnormalities. Treatment of the cyst was by open resection in 12 and arthroscopic evaluation at meniscectomy in seven. In one case the cyst resolved after arthroscopic partial meniscectomy alone. Meniscal tears were treated by arthroscopic partial medial meniscectomy. Medial meniscal cysts are an important but under-diagnosed cause of knee pain and are frequently related to arthroscopically diagnosable and treatable meniscal pathology. Treatment should be directed towards both the meniscus and the cyst, which may require open surgery.

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