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Menisco-meniscal ligaments in knee joint are known as four variants, anterior and posterior transverse meniscal ligament, medial and lateral oblique menisco-meniscal ligament. The ligament which originates from the anterior horn of the meniscus and attached to the posterior horn of the same meniscus, so-called unilateral menisco-meniscal ligament is extremely rare in English literature. The authors experienced a case of medial unilateral menisco-meniscal ligament with posterior horn tear of the medial meniscus in a 49-year-old man. We report this case with a review of literature.