Types of meniscus repair surgery
Different surgical approaches are used for meniscus repair. The extent and location of the meniscus tear is often a key factor in determining which procedure to use. Your surgeon will consult with you on the best technique for your case, which typically involves one of these approaches:
- Repair of torn cartilage tissue
- Regrowth of your own cartilage tissue to repair the damaged cartilage
- Transfer of cartilage tissue from a healthy area of your body (or from a donor) to the damaged area
Sometimes a torn meniscus is mild enough to be repaired with suturing tools, enabling a surgeon to stitch together the healthy parts of a meniscus. This procedure is performed using a minimally invasive arthroscopy.
A person can sometimes grow their own new cartilage cells to repair the damage caused by a torn meniscus.
- Autologous chondrocyte implantation (ACI): ACI is a two-step procedure in which new cartilage cells are grown outside of the body, and then re-implanted in the damaged cartilage. In the first step, cartilage is retrieved from your knee through two small incisions. This cartilage is sent to a lab where they grow millions of your own cells. In the second step, the new cartilage cells are implanted into the knee using conventional surgery. The cells mature over time—as long as 18 months—and become cartilage. This procedure is recommended for younger, active patients with meniscus damage that is less than two centimeters in diameter.
- Microfracture: This technique stimulates the growth of cartilage by creating a new blood supply. It’s achieved by creating tiny fractures in the bones in the knee joint, allowing marrow to reach the joint surface to create cells that form the new cartilage. This procedure can be done arthroscopically and is most effective for active people with limited cartilage damage.
Some meniscus damage is repaired by using cartilage from a healthy part of your body or from a donor and using it in place of the damaged tissue.
- Osteochondral autograft transfer: This procedure retrieves cartilage from a healthy, non-weight bearing part of the knee and transfers it to the damaged area of the knee joint. The size of the healthy tissue is matched to the affected area and put into place, leaving a smooth surface. It’s used to treat small meniscus damage and may be performed arthroscopically.
- Osteochondral allograft transplantation: This procedure is used for people who have larger, more disabling meniscus injuries or knee or ankle disease. It retrieves healthy cartilage tissue from a donor, matching its size and shape to fit the damaged area. Once in place, the healthy tissue is pressed to conform to the affected area. This technique is most effective for younger, more active people.
- Meniscal allograft transplantation: In this procedure, a meniscus is taken from a cadaver and implanted into a patient’s knee joint. This technically demanding surgery requires specialized expertise and is performed arthroscopically. It can help lessen knee pain, improve mobility, and possibly prevent arthritis. It’s only performed in cases where most of the meniscus cartilage must be removed.