Menisci are fibrocartilaginous anatomical structures with a crescent shape located inside the joint cavity, with an emphasis on the knee joint. They play an extremely important role in the biomechanics of the knee, the protection of the articular cartilage and in the stability of the knee. Lesions of the meniscus represent the most common knee injury and are also the most common reason for knee surgery. The diagnostic procedure for meniscal lesions consists of anamnesis, clinical examination, clinical tests, MRI and arthroscopy. Treatment of meniscal lesions can be conservative or operative. Conservative treatment involves the use of physical therapy, weight reduction and lifestyle changes. Operative treatment of meniscal lesions today is performed arthroscopically, and includes meniscal suturing, partial or total meniscectomy, reconstruction and meniscal transplantation. Partial and total meniscectomy are rarely performed today, and when they are performed, these procedures are as sparing as possible due to the proven accelerated development of OA after meniscectomy. Suturing of the meniscus is the method of choice in the operative treatment of meniscus lesions in order to preserve its integrity. There are three main methods of suturing: from the inside out, from the outside in and all in. The choice of suturing method depends on the type, location, extension and appearance of the lesion. Meniscus reconstruction and transplantation represents the installation of synthetic biodegradable supports or cadaveric meniscus that replace a partially or totally resected meniscus. The most commonly used synthetic supports are collagen and polyurethane.