Meniscus tears are a very common cause of knee pain. Tears of the meniscus can vary by location, type, size and the amount of pain they produce. The most common location for a meniscus tear in the knee is the posterior horn of the medial meniscus.
The meniscus is a “c”-shaped cartilage disk that’s found in the knee. We have two menisci in either knee. We have the medial meniscus on the inner side of the knee and the lateral meniscus on the outer side of the knee. The menisci serve a critical function in the knee as a shock absorber or cushion. This helps to minimize the stress on another type of cartilage that we have in the knee which we call the articular cartilage. The articular cartilage coats the ends of our bones within a joint. If the articular cartilage wears away, arthritis will occur. By protecting the articular cartilage, the meniscus helps prevent the onset of arthritis.
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Causes of Posterior Horn Meniscus Tears
People can suffer tears of the meniscus because of trauma, sports injuries or the meniscus can tear simply because it wore out. By far, the most common location for a tear is in the back, and on the inner or medial side of the knee — that is the area we call the posterior horn of the medial meniscus.
The posterior horn is also the most common area for degenerative tears of the meniscus where the tissue simply wore out … and it is a very common cause of pain in runners.
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Treatments for Meniscus Tears
Just because something is torn, doesn’t always mean that it needs to be “fixed”. Surgery for meniscus tears is not always necessary. (Click to Tweet this fact to your friends) This is particularly true for a “degenerative” posterior horn medial meniscus tear. On the other hand, “Flap tears”, “bucket-handle tears” and other larger tears of the meniscus are more than likely to lead to surgery because of the persistent pain and mechanical symptoms such as popping, locking and instability. Posterior horn medial meniscus tears in children tend to lead to a recommendation to consider surgery since these tears are usually repairable. In addition, children have much more regenerative or healing potential. If a meniscus tear is repaired, then the risk of developing arthritis drops significantly.
Generally speaking, the treatment options for meniscus tears include rest, physical therapy, activity modification and occasionally a surgery we refer to as an arthroscopy.
Arthroscopy for Medial Meniscus Tears
An arthroscopy involves placing a small fiberoptic camera into the knee through a 1/4 inch incision. The camera is used to visualize the meniscus and other structures within the knee. During an arthroscopy, we have the choice of either repairing the meniscus tear or removing the torn piece. The decision to repair or remove the torn portion is made at the time of surgery. We need to see whether or not the meniscus is repairable based on its quality, location and size. Preference is given to repair posterior horn medial meniscus tears, if possible, to help preserve the meniscus and minimize the risk of developing arthritis.
This video of the normal knee anatomy will help orient you and show you where the posterior horn of the medial meniscus is located.
Additional Reading on Meniscal Tears: