What is knee ligament repair?

Ligaments are bands of tough, elastic connective tissue that surround a joint to give support and limit the joint's movement.

When ligaments are damaged, the knee joint may become unstable. Ligament damage often happens from a sports injury. A torn ligament severely limits proper knee movement. This results in the inability to pivot, turn, or twist the leg. Surgery is a choice to fix a torn ligament if other treatment does not work.

The ligaments in the knee connect the femur (thighbone) to the tibia (shin bone). There are 4 major ligaments in the knee:

  • Anterior cruciate ligament (ACL). This ligament controls rotation and forward movement of the tibia (shin bone).
  • Posterior cruciate ligament (PCL). This ligament controls backward movement of the tibia (shin bone).
  • Medial collateral ligament (MCL). This ligament gives stability to the inner knee.
  • Lateral collateral ligament (LCL). This ligament gives stability to the outer knee.

Front view of knee joint showing ligaments.

Why might I need a knee ligament repair?

The ACL is located toward the front of the knee. It's the most common ligament to be injured. The ACL is often stretched or torn during a sudden twisting motion (when the feet stay planted one way, but the knees turn the other way). Skiing, basketball, and football are sports that have a higher risk of ACL injuries.

The PCL is located toward the back of the knee. It's also a common knee ligament to be injured. But the PCL injury usually happens with sudden, direct impact, such as in a car accident or during a football tackle.

The MCL is located on the inner side of the knee. It's injured more often than the LCL, which is on the outer side of the knee. Stretch and tear injuries to the collateral ligaments are usually caused by a blow to the side of the knee, such as when playing hockey or football.

Early medical treatment for knee ligament injury may include:

  • Rest
  • Ice pack application (to reduce swelling that happens within hours of the injury)
  • Compression (from an elastic bandage or brace)
  • Elevation
  • Pain relievers

A knee ligament tear may be treated with the following:

  • Muscle-strengthening exercises
  • Protective knee brace (for use during exercise)
  • Activity limitations

Knee ligament repair is a treatment for a complete tear of a knee ligament that results in instability in the knee. This repair is done by an orthopedic surgeon, a surgeon who specializes in treating bone, muscle, joint and tendon problems. People with a torn knee ligament may be unable to do normal activities that involve twisting or turning at the knee. The knee may buckle or “give-way.” If medical treatments are not satisfactory, ligament repair surgery may be an effective treatment.

The surgery to correct a torn knee ligament involves replacing the ligament with a piece of healthy tendon. A tendon from the kneecap or hamstring, for example, is grafted into place to hold the knee joint together. The tendon graft may come from the person (autograft) or from an organ donor (allograft).

There may be other reasons for your healthcare provider to recommend a knee ligament repair.

What are the risks of knee ligament repair?

As with any surgery, complications can happen. Some possible complications are:

  • Bleeding
  • Infection
  • Blood clots in the legs or lungs

Some people may experience pain, limited range of motion in the knee joint, and occasional swelling in the knee after surgical ligament repair. Others have increased motion in the knee joint as the graft stretches over time.

There may be other risks depending on your specific health condition. Talk about any concerns with your surgeon before the procedure.

How do I get ready for a knee ligament repair?

  • Your  surgeon will explain the procedure to you and offer you the chance to ask any questions that you might have about the procedure.
  • You will be asked to sign a consent form that gives your permission to do the procedure. Read the form carefully and ask questions if something is not clear.
  • In addition to a complete medical history, your healthcare provider may perform a complete physical exam to ensure you are in good health before undergoing the procedure. You may undergo blood tests or other diagnostic tests.
  • Tell your  surgeon if you are sensitive to or are allergic to any medicines, latex, tape, and anesthetic agents (local and general).
  • Tell your  surgeon of all medicines (prescribed and over-the-counter) and herbal supplements that you are taking.
  • Tell your surgeon if you have a history of bleeding disorders or if you are taking any anticoagulant (blood-thinning) medicines, aspirin, or other medicines that affect blood clotting. It may be necessary for you to stop these medicines before the procedure.
  • If you are pregnant or think you could be, you should notify your surgeon.
  • You will be asked to fast for 8 hours before the procedure, generally after midnight.
  • You may receive a sedative before the procedure to help you relax. Because the sedative may make you drowsy, you will need to arrange for someone to drive you home.
  • You may meet with a physical therapist before your surgery to discuss rehabilitation.
  • Arrange for someone to help around the house for a week or two after you are discharged from the hospital.
  • Based on your health condition, your healthcare provider may request other specific preparations.

What happens during a knee ligament repair?

Knee ligament repair may be done on an outpatient basis or rarely as part of your stay in a hospital. Procedures may vary depending on your condition and your surgeon's practices.

Knee ligament repair may be performed while you are asleep under general anesthesia, or while you are awake under spinal anesthesia. If spinal anesthesia is used, you will have no feeling from your waist down. Your surgeon will discuss this with you in advance.

Generally, knee ligament repair surgery follows this process:

  1. You will be asked to remove clothing and will be given a gown to wear.
  2. An intravenous (IV) line may be started in your arm or hand.
  3. You will be positioned on the operating table.
  4. The anesthesiologist will continuously monitor your heart rate, blood pressure, breathing, and blood oxygen level during the surgery.
  5. The skin over the surgical site will be cleansed with an antiseptic solution.
  6. The surgeon will make several small incisions in the knee area.
  7. The surgeon will do the surgery using an arthroscope (a small tube-shaped instrument that is inserted into a joint). The surgeon may reattach the torn ligament or reconstruct the torn ligament by using a portion (graft) of the patellar tendon (that connects the kneecap to the tibia), the hamstring tendon (from the back of the thigh), or other autografts. The tendon graft may come from the person (autograft) or from an organ donor (allograft).
  8. The surgeon will drill small holes in the tibia and femur where the torn ligament was attached.
  9. The surgeon will thread the graft through the holes and attach it with surgical staples, screws, or other means. Bone eventually grows around the graft.
  10. The incision will be closed with stitches or surgical staples.
  11. A sterile bandage or dressing will be applied.

What happens after a knee ligament repair?

After the surgery, you will be taken to the recovery room for observation. Your recovery process will vary depending on the type of anesthesia that is given. Once your blood pressure, pulse, and breathing are stable and you are alert, you will be taken to your hospital room or discharged to your home. Knee ligament repair is usually done on an outpatient basis.

You may be given crutches and a knee immobilizer before you go home.

Once you are home, it's important to keep the surgical area clean and dry. Your healthcare provider will give you specific bathing instructions. The stitches or surgical staples will be removed during a follow-up office visit.

Take a pain reliever for soreness as recommended by your surgeon. Aspirin or certain other pain medicines may increase the chance of bleeding. Be sure to take only recommended medicines.

To help reduce swelling, you may be asked to elevate your leg and apply an ice bag to the knee several times per day for the first few days. Your healthcare provider will arrange for an exercise program to help you regain muscle strength, stability, and range of motion. Physical therapy is a key part of recovery.

Tell your surgeon if you have any of the following:

  • Fever or chills
  • Redness, swelling, bleeding, or other drainage from the incision site
  • Increased pain around the incision site
  • Numbness or tingling in the leg
  • Calf swelling or tenderness

You may resume your normal diet unless your healthcare provider advises you differently.

Because of the limited mobility, it may be hard for a few weeks to resume your normal daily activities. You may need someone at home to assist you. You should not drive until your healthcare provider tells you to. Other activity restrictions may apply. Full recovery from the surgery and rehab may take several months.

Your surgeon may give you additional or alternate instructions after the procedure, depending on your particular situation.

Next steps

Before you agree to the test or the procedure make sure you know:

  • The name of the test or procedure
  • The reason you are having the test or procedure
  • What results to expect and what they mean
  • The risks and benefits of the test or procedure
  • What the possible side effects or complications are
  • When and where you are to have the test or procedure
  • Who will do the test or procedure and what that person’s qualifications are
  • What would happen if you did not have the test or procedure
  • Any alternative tests or procedures to think about
  • When and how you will get the results
  • Who to call after the test or procedure if you have questions or problems
  • How much you will have to pay for the test or procedure

Treating ACL Injuries

Treating Anterior Cruciate Ligament (ACL) Injuries

The ACL (anterior cruciate ligament) is a band of tough, fibrous tissue that stabilizes the knee. Injuries to the ACL are very common, especially among athletes. Treatment for your injury may or may not involve surgery. Treatment depends on the severity of the injury and how active you hope to be in the future. Treatment also depends on the type of activities you wish to participate in. Your healthcare provider can discuss your treatment options with you. Front view of knee joint showing tear in anterior cruciate ligament.

Reduce pain and swelling

Whether or not you have surgery, you can help reduce pain and swelling with rest, ice, compression, and elevation. Rest with your knee elevated above heart level. Put ice on your knee  3 to 5 times a day for  10 to 15 minutes at a time. Keep a thin cloth between the ice and your skin. A compressive wrap may also help reduce swelling. Take any medicines that are prescribed and follow any other instructions you’re given.

Use crutches

Crutches can help you get around during your recovery. They reduce stress on your knee. Follow your healthcare provider’s advice about the use of crutches and  how much weight to put on your injured leg. Use crutches or a brace for as long as advised.

If you need surgery

For severe ACL injuries, you may need a procedure called ACL reconstruction. This is surgery that uses a graft (new tissue) to replace a torn ligament. If surgery is needed, your healthcare provider can give you more information about it.


Whether or not you have surgery, rehabilitation exercises are important. Exercise is needed to strengthen the muscles that support your knee. It will also help you regain flexibility, reduce pain, and prevent other knee problems in the future. Your healthcare provider can show you the best exercises for your knee. They will also tell you how long and how often to exercise.

When to call your healthcare provider

Call your healthcare provider right away if you have any of these:

  • Severe or increasing pain in your knee or leg
  • Swelling in your entire leg
  • Redness or warmth in your leg
  • Heat, swelling, or tenderness in your calf
  • Fever that lasts more than 24 hours

Treating MCL Problems

Treating Medial Collateral Ligament (MCL) Problems

Treatment for an MCL injury can be nonsurgical or surgical. Nonsurgical treatment is used much more often. With either one, rehab will be part of your treatment.

Front view of knee showing the medial collateral ligament.

Nonsurgical treatment

This treatment starts with rest, ice, and elevation. This eases pain and swelling. In the next stage, you start exercises to improve your knee’s range of motion, strength, and flexibility. You may need a brace for weeks after your injury. Using crutches or a brace rests your joint, helping it to heal.


Surgery is seldom used to fix an MCL injury. But sometimes it is advised, especially if some other part of your knee is hurt. Open surgery is used to screw or stitch the MCL back into place. If fixing the original MCL is not possible, an MCL graft may be used. Based on their location, other knee injuries may be fixed using arthroscopy. With arthroscopy, a tiny camera lets your healthcare provider see inside the joint. Tools are put in through small cuts to fix the joint.

Pre-op checklist

  • Stop taking aspirin and other medicines 7 days before surgery, or as your healthcare provider directs.

  • Arrange to get correctly sized crutches to use as you heal.

  • Don’t eat or drink 10 to 12  hours before surgery (or as your healthcare provider directs).

  • Arrange for someone to drive you home after surgery.

After surgery

Right after surgery, you’ll spend a few hours in a recovery unit. Your knee will be bandaged. Ice will be applied, and your leg raised. Depending on the surgery performed, physical therapy may start shortly after. A brace and crutches are often used after surgery. You may have limits on weight bearing and activity while you heal.