The meniscus is a meniscus-shaped cartilage pad within the knee joint, one on the inside and one on the outside, called the medial meniscus and the lateral meniscus, respectively. The functions of the meniscus include load transmission, shock absorption, joint stabilization, proprioception, etc. It is one of the important structures of the knee joint. Meniscal tears can result in knee pain and swelling, joint interlocking, and limited extension and flexion activities. Meniscal injuries tend to be traumatic tears in younger people and degenerative in older people. A meniscal injury requires a magnetic resonance imaging (MRI) examination of the knee to confirm the diagnosis. A fresh meniscal injury has the potential for repair, and delayed treatment may further increase the extent of the meniscal injury, while an injured meniscus can accelerate degeneration of the articular cartilage, so a clearly diagnosed meniscal injury should be treated aggressively. Minimally invasive meniscus suturing, molding and resection can be done arthroscopically.