Chances are, if you participate in sports, then you know someone who
has had a torn ACL. One of the most widely recognized and dreaded
sports injuries, anterior cruciate ligament tears are a common knee
injury. Over 100,000 ACL reconstruction surgeries
annually across the United States, and this of course only counts those
individuals who undergo surgery.
ACL tears among females has been a hot topic in the media, being
featured in national publications and television.
Understanding a torn ACL and what causes this
injury can help with the prevention of these injuries, but also with
treatment and rehabilitation following injury. First let's start with
what the ACL does...
The anterior cruciate ligament is one of two ligaments found within the
. It connects the tibia
(shin bone) with the femur (thigh
bone), running in a diagonal direction within the joint. The primary
function of the ACL is to prevent anterior, or forward, translation of
the tibia in relation to the femur. In a simpler sense, it helps to
keep the knee stable.
The ACL becomes tight when your knee is fully extended (straightened)
and when it is fully flexed (bent). With this in mind, we can better
understand how the ACL is injured.
How a Torn ACL Occurs
If you talk with someone who has injured their ACL, or if you have
injured your ACL, you will probably recognize the method of injury. In
many cases, a torn acl occurs from a non-contact type of mechanism
which involves a twisting motion of the knee
times this occurs when planting the foot and turning. This type of
mechanism is common in sports that require quick changes of direction,
such as basketball, soccer, and football.
Another common way to tear the acl is to land forcefully on a fully
extended leg. As you land, the weight of your body forces your knee to
buckle, and since the ACL is already tight in extension, the force is
too great, resulting in a torn acl.
Although not as common, contact injuries can also
cause a torn ACL. Football, rugby, and other contact athletes can
suffer ACL tears, usually from some kind of force placed on the outside
of the knee while the foot is planted firmly on the ground.
In addition to tearing the ACL, these mechanisms can also cause injury
to the meniscus and the MCL. This combination of injuries is known as The Unhappy Triad.
What To Expect From
An ACL Tear
Most people who suffer from a torn ACL will describe the injury as feeling
and or hearing a "pop" in their knee
, having immediate pain,
and being unable to move the knee, or place weight on their leg. The
"pop" is a very classic sign of an ACL tear.
After an ACL tear, the knee will swell up,
generally within 30 minutes to an hour, and the swelling will be all
around the knee. Often, athletes will describe their knee as looking
like a "grapefruit", or "balloon". This swelling is called effusion,
and is contained within the knee joint. It is a result of the bleeding
caused by the tearing of the ligament.
Other signs and symptoms of an ACL tear
moderate to severe
pain, inability or unwillingness to bend or straighten the knee
completely, and loss of strength in the leg muscles.
What To Do For An ACL Tear
Much like any type of injury, the best course of treatment for a torn
acl is to follow the R.I.C.E principles
of rest, ice,
compression, and elevation. While you may not
know if you have a torn ACL or not, if you have a
significant amount of pain and swelling in your knee, you should see
your family physician or certified athletic trainer
as soon as possible.
An ACL tear is a significant knee injury, and for the best outcomes and
recovery, usually requires surgery to reconstruct the injured ACL. In
the healthy, active person, a full recovery can be achieved through
surgery and proper rehabilitation.Learn
more about ACL Reconstruction
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