Knee Ligament Repair

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.


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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.

Why might I need a knee ligament repair?

The ACL is located toward the front
of the knee. It is 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 is 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 is 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.


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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. 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.

How do I get ready for a knee ligament repair?

  • Your healthcare provider 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 healthcare provider if you are sensitive to or are allergic to any medicines, latex, tape, and anesthetic agents (local and general).
  • Tell your healthcare provider of all medicines (prescribed and over-the-counter) and herbal supplements that you are taking.
  • Tell your healthcare provider 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 suspect that you are pregnant, you should notify your healthcare provider.
  • You will be asked to fast for 8 hours before the procedure, generally after midnight.
  • You may receive a sedative prior to
    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 prior to 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 healthcare provider’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 healthcare provider will discuss this with you in advance.


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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 healthcare provider will make several small incisions in the knee area.
  7. The healthcare provider will do the
    surgery using an arthroscope (a small tube-shaped instrument that is inserted into a
    joint). The healthcare provider 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 healthcare provider will drill small holes in the tibia and femur where the torn ligament was attached.
  9. The healthcare provider 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.
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