Meniscal allograft transplantation is a type of surgery in which a new meniscus, a cartilage ring in the knee, is placed into your knee. The new meniscus is taken from a person who has died (cadaver).

There are two cartilage rings in the center of each knee, one on the inside (medial meniscus) and one on the outside (lateral meniscus). When a meniscus is torn, it is commonly removed by knee arthroscopy. However, some people can still have pain after the meniscus is removed, or several years after the meniscus is removed.

A meniscus transplant places a new meniscus in your knee where the meniscus is missing. This procedure is only done in cases of meniscus tears that are so severe that all or nearly all of the meniscus cartilage has to be removed. The new meniscus can help knee pain and possibly prevent future arthritis. The new meniscus is tissue taken from a cadaver (allograft).

If your doctor finds that you are a good candidate for a meniscus transplant, x-rays of your knee are usually taken to find a meniscus that will fit your knee. The allograft is tested in the lab for possible diseases.

Other surgeries, such as ligament or cartilage repairs, may be performed at the time of the meniscus transplantation or with a separate surgery.

The meniscus transplant is usually performed by knee arthroscopy. You will likely be asleep during the surgery. When arthroscopy is performed, a camera is inserted into your knee through a small poke hole, and is connected to a video monitor. First, the surgeon will check the cartilage and ligaments of your knee. Then the surgeon will confirm that a meniscus transplant is appropriate, and that you don't have severe arthritis of the knee.

The new meniscus will be prepared to fit your knee correctly. If any tissue remains from your old meniscus, it will be removed using a shaver or other instruments. An incision is made in the front of your knee to insert the new meniscus into the knee. Sutures are used to sew the new meniscus in place. Another incision may be needed to sew the meniscus in place. Screws or other devices may be used to hold the meniscus in place.

After the surgery is finished, the incisions are closed, and a dressing is applied. During the arthroscopy, most surgeons take pictures of the procedure from the video monitor to show you what was found and what was done.

Meniscus allograft transplantation may be recommended for knee problems such as:

• Knee pain
• Unstable knee
• Knee that gives way
• Inability to play sports or other activities