Sunday, June 21, 2009

Knee Surgery: Anterior Cruciate Ligament Reconstruction

By Dr. Stefan Tarlow

An Overview of ACL Reconstruction

The ACL (anterior cruciate ligament) is the stabilizer of the knee. It is torn easily because of the extent of activity and stress the knee joint is subjected to on a regular basis and the location of the ligament. Each patient must make the choice as to whether or not his or her ACL damage should be treated surgically.

It is based on such factors as how much damage the rest of the knee structure has suffered, the stability of the knee, the patients activity level, and the patients age. If surgery will allow the patient to return to the pre-injury activity level, it is usually recommended.

ACL reconstruction can stabilize the knee and prevent further damage to the articular cartilage and the cartilage cushions, known as the menisci. It can also help in preventing premature knee deterioration.

Without exception, ACL reconstruction is performed arthroscopically. I personally prefer to use an autograft-tissue graft. Autograft is a graft harvested from the patient. An allograft, which is harvested from a cadaver is another possibility.

I think that using the patients own tissue results in a more successful reconstruction that yields better long term results. Specifically, I believe that by using the patients own tissue, ACL re-injury rates are lowered. Interestingly, there have been two scientific studies conducted in the past few years that indicate a high failure rate - ten to twenty-five percent - if a young patient (under 25) receives allograft tissue and also participates in an aggressive program of rehabilitation.

Click here to learn more about knee arthroscopy.

My preference is to use a Patellar Tendon Autograft combined with interference screw fixation when dealing with patients under thirty years of age who do not have any underlying patellofemoral disease. I also prefer Hamstring Autograft (semitendinosis and gracilis combined) using rigid extra-articular fixation (Rapid Loc or Toggle Loc) on the femur along with a Washer Loc on the tibia.

If the patient is under age 25, I have been known to use an allograft as long as the patient guarantees he will not engage in aggressive, competitive sports for a full year following the surgery. This period of time gives the allograft a chance to heal. Also, I will use allografts when there is more than one ligament that needs to be reconstructed.

The knee is stabilized and stress is kept at a minimum across the knee joint by the ACL.

Excessive forward movement of the tibia (lower bone of the leg) in relation to the femur (thigh bone) is also prevented by the ACL.

Excessive knee rotation is also kept under control by the ACL.

Click here to learn more about Dr. Stefan Tarlow, a leading Phoenix Knee Doctor.

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