Meniscus surgery is a procedure performed to repair a torn, damaged, meniscus. The meniscus is a fibrocartilage disc that sits between the femur (thighbone) and tibia (shinbone). The meniscus acts as a shock absorber in the knee. Each knee has two menisci: one is located on the inside of the knee (medial) and one is on the outside of the knee (lateral). The meniscus can be damaged during forceful rotation, pivoting, squatting and twisting. Meniscus injuries are common in adults over 30 years old, however, these injuries can occur in anyone and at any age. Many meniscus tears can be treated without surgery. Meniscus surgery may be a necessary to reduce pain, weakness, and instability in the knee when a tear is symptomatic.