Yes, a meniscus can be replaced, but replacement is not the first choice for most people

A meniscus replacement is a surgical procedure in which a damaged meniscus — the cartilage pad in your knee — is removed and replaced with either a synthetic implant or a transplant from a donor. The surgery exists and is performed, but it is not routine. Most people with a torn meniscus either have the torn piece removed (called a meniscectomy) or have the tear repaired if the damage is in the right location and the tissue is healthy enough to stitch.

Replacement is typically considered only when the meniscus is severely damaged, when repair has already failed, or when you are young enough that losing the entire meniscus would leave you at high risk for arthritis later. Your surgeon will examine the tear location, your age, your activity level, and the overall health of your knee before recommending replacement over the other options.

Key Takeaways

  • Meniscus replacement is performed but is not the standard first treatment for a torn meniscus.
  • Repair (stitching the tear) and meniscectomy (removing the torn piece) are more common and less invasive than replacement.
  • Replacement uses either a synthetic scaffold or a donor meniscus, depending on your age, the tear pattern, and surgeon preference.
  • Recovery from replacement surgery takes longer than repair or meniscectomy, typically four to six months before returning to normal activity.
  • Long-term outcomes for synthetic replacements are still being studied; donor meniscus transplants have a longer track record but require a match.

When repair is possible instead of replacement

If your tear is in the outer third of the meniscus — the part with blood supply — your surgeon will usually try to repair it by stitching the tear closed rather than removing or replacing tissue. A repaired meniscus preserves the cartilage you have, which is the goal whenever possible. Repair works best on tears that are relatively fresh, on people under 40, and on tears that run in a specific pattern (called a vertical or longitudinal tear).

Repair is done arthroscopically, meaning the surgeon uses a small camera and thin instruments inserted through tiny cuts. Recovery is faster than replacement, and you keep your own meniscus. The downside is that not all tears can be repaired — if the tear is in the inner two-thirds of the meniscus where there is no blood supply, or if the tear is complex or old, repair will not hold.

Meniscectomy: removing the torn piece

If repair is not possible, the surgeon removes only the torn portion of the meniscus, leaving the healthy tissue behind. This is called a partial meniscectomy and is one of the most common knee surgeries. It is less invasive than replacement, recovery is faster (usually two to four weeks), and it works well for many people in the short term.

The trade-off is that removing meniscus tissue, even a small amount, changes how your knee distributes weight and absorbs shock. Over time — sometimes years, sometimes decades — this can increase your risk of arthritis in that knee. Meniscectomy is still the right choice for many people, especially those over 50 or those with less demanding activity levels. But for younger, active people, surgeons may recommend replacement to preserve the knee's long-term function.

Synthetic meniscus implants

A synthetic meniscus replacement is a scaffold made from materials like polyurethane or collagen that is shaped like a meniscus and implanted into your knee. The idea is that your own tissue will grow into and around the scaffold, creating a new meniscus over time. The most widely used synthetic implant in the United States is called Actifit.

Synthetic implants have advantages: there is no waiting for a donor match, the surgery can be done relatively quickly, and the implant is designed to be durable. However, the long-term outcomes are still being tracked. Some people report good results years after surgery; others experience pain or the implant breaking down. Synthetic replacement is often recommended for people in their 30s and 40s who are active and want to preserve knee function, because they have decades of life ahead and the risk of arthritis from meniscus loss is high.

Recovery from synthetic implant surgery typically takes four to six months before you return to normal activities, and six to twelve months before you can return to high-impact sports.

Meniscus transplant from a donor

A meniscus transplant uses a meniscus from a deceased donor, matched to your knee size and blood type. This is a real meniscus, not a scaffold, so it functions more like your original tissue. Transplants have been performed for decades and have a longer track record than synthetic implants.

The main limitation is availability. Finding a matched donor meniscus takes time, and not all hospitals have access to a transplant program. Transplants are also more expensive than synthetic implants or meniscectomy. You will need to take immunosuppressive medication to prevent your body from rejecting the donor tissue, which carries its own risks and side effects.

Meniscus transplants are often recommended for younger people (typically under 50) with severe meniscus damage who want the best chance of preserving the knee long-term. Recovery is similar to synthetic replacement — four to six months for normal activity, longer for sports.

What the surgery involves and recovery timeline

Meniscus replacement surgery is performed arthroscopically, using a camera and small instruments. The surgeon removes the damaged meniscus and implants the replacement (synthetic or donor) in its place. The procedure usually takes one to two hours. You go home the same day or the next day.

In the first two weeks, you will use crutches and ice the knee to manage swelling. Physical therapy begins within the first week and continues for several months. At four to six weeks, most people can walk without crutches and return to light activities. Returning to sports or heavy exercise typically takes six to twelve months, depending on the type of replacement and your healing.

Pain and swelling are normal in the first month. Some people experience persistent swelling or stiffness that takes months to resolve. Your surgeon will give you specific restrictions on movement and weight-bearing during the healing phase.

Cost and what insurance covers

Meniscus replacement is more expensive than meniscectomy or repair because it involves implant costs and longer surgical time. A synthetic implant replacement typically costs between $15,000 and $30,000 total (surgery, implant, anesthesia, facility), though this varies by hospital and region. A meniscus transplant is usually more expensive because of the cost of procuring and preserving donor tissue.

Most insurance plans cover meniscus replacement when it is recommended by your surgeon and deemed medically necessary. Medicare covers it. However, some plans may require pre-authorization or may have limits on which implants they will cover. Check with your insurance company before surgery to understand your out-of-pocket costs.

Frequently Asked Questions

Can you live without a meniscus?

Yes, many people live without a meniscus after meniscectomy and function well. However, the knee absorbs shock less effectively, and arthritis risk increases over time. This is why replacement is considered for younger, active people who would otherwise lose the meniscus.

How long does a synthetic meniscus implant last?

Long-term durability data is still being collected because synthetic implants are relatively newer. Some implants have performed well for 10+ years, but some have failed or degraded sooner. Your surgeon can discuss the specific implant's track record.

Is meniscus transplant better than synthetic replacement?

Neither is universally "better" — it depends on your age, activity level, and what is available. Transplants use real tissue and have a longer track record, but require a donor match and immunosuppression. Synthetic implants are more readily available but have less long-term data. Your surgeon will recommend based on your situation.

Can a meniscus tear heal on its own?

Some very small tears in the outer part of the meniscus (where blood supply exists) may heal partially on their own with rest and physical therapy. However, most tears do not fully heal without surgery because the inner meniscus has no blood supply. An MRI can show whether your tear is healing or needs intervention.

What happens if you don't have meniscus surgery?

If you have a torn meniscus and do not have surgery, the tear may stay the same, get worse, or cause the meniscus to slip and lock your knee. You may experience pain, swelling, and instability. Over time, an untreated tear can lead to arthritis. Surgery is usually recommended if the tear is causing symptoms or if imaging shows it is unstable.