The meniscus is an important structure within the joint that supports weight, lubricates, stabilizes and nourishes the joint surface. When meniscal injury occurs, it mainly manifests as joint pain and swelling with limited movement; however, when meniscal degeneration exists with increasing age, many people in the elderly may experience meniscal injury in their daily lives even without a significant history of sprain and trauma. Magnetic resonance imaging is a non-invasive technique that can accurately evaluate meniscal tears. Non-surgical treatment of acute meniscal injuries includes protective weight bearing, reduced activity, ice, and anti-infective medications. The goal of treatment is to reduce swelling and increase range of motion, making sure to reduce flexion and squatting movements during this time. After 1 to 2 months of conservative treatment, if the patient continues to feel pain, swelling and weakness in the affected knee, surgical treatment is necessary. Meniscus surgery’s include meniscectomy, meniscus repair, and meniscus transplantation. The principle of meniscectomy is to remove the unstable part of meniscus to make the contour smooth and keep it stable. Meniscal sutures need to take into account the time since the tear, the extent of the tear, the morphology, the localization or zoning of the tear, and whether there is a combined injury to the cruciate ligament. Meniscal transplantation is appropriate for patients under 45 years of age who have persistent pain after 6 months of non-surgical treatment following meniscectomy and who require concomitant cruciate ligament reconstruction if there is a comorbid cruciate ligament injury. However, long-term follow-up studies are lacking, and many doubt whether allograft meniscus transplantation can reduce arthritis due to meniscectomy.