What is the acl, and what does it do in the knee?

Main knee stabilizer. The anterior cruciate ligament (acl) is one of the main stabilizing ligaments of the knee joint. It allows us to safely perform cutting sports without the knee feeling like it will collapse or buckle. The ACL originates on the femur (thigh bone) and inserts on the tibia (leg bone).
Knee ligament. Acl stands for anterior cruciate ligament. This ligament limits anterior translation and medial rotation of the tibia in respect to the femur and it limits hyperextension of the knee. Functionally it provides stability of the knee when decelerating when running r jumping or "cutting" while running.
Ligament. The acl is one of 4 major ligaments that support the knee. It is commonly torn with a non contact twisting injury. It helps to control front to back motion and rotation of the shin bone (tibia) on the thigh bone (femur). It is important for stability with twisting and cutting movements. It is commonly surgically reconstructed in active patients.

Related Questions

What is the bucket handle in the knee? My husband tore his ACL & rcl and has a flipped bucket handle what does this mean?

The . The knee has 2 "compartments" between the thigh bone (femur) and shin bone (tibia). The bones are covered with end cartilage--the smooth, hard cartilage that makes the joint glide. Between these 2 bones is the shock-absorber cartilage, called the meniscus. There is a meniscus for each of these compartments. When the mensicus is torn, it can have different patterns of injury. The "bucket handle" tear is when the meniscal cartilage tears around the edge, creating an inner and outer portion. The inner portion can then flip up into the joint, like a bucket handle. It can block knee motion and damage the joint cartilage. It sounds like your husband had a pretty significant injury to his knee. I'm not sure what you mean by "rcl"--the other ligaments in the knee are the posterior cruciate ligament, medial collateral ligament, and lateral collateral ligament. The acl is the anterior cruciate ligament and is commonly torn in twisting injuries. If he has injury to the acl, the mensicus, and one of the collateral ligaments, it is called an "unhappy triad" and usually is the result of a high impact injury to the side of the knee. He should be seen by an orthopaedic surgeon with sports medicine training. Depending on his age and activity level, he may or may not require ligament repair/reconstruction, but an unstable mensicus tends to be problematic and require surgery. Read more...
Big tear . It means that the tear is very big and can cause the knee to lock up and be painful. In your husbands case the year is so big that the torn portion flipped from its normal position and lodged itself in the middle if the knee joint. He will probably need surgery. Read more...

Does having a ACL problem cause you to have slipping in the knee and instability?

Yes. Acl functions to stabilize the forward backward motion of the knee (upper leg to lower leg) thus a tear can result in instability in that plane of movement. The decision for repair depends on several issues but primarily on your age, health and activity level. Read more...
Yes it can. If you have a complete tear in the anterior cruciate ligament you may feel as though your knee is slipping of shifting due to the lack of stability from that ligament. The stabillity of the other knee ligaments and quad and hamstring stability determine the amount of instability. Read more...
Yes. An acl tear can result in knee instability. The lower leg (tibia) can slide forward and rotate relative to the thigh (femur). This can result in near dislocation events and can lead to further damage of the cartilage and meniscus. In younger patients who want to remain active in sports, a torn acl should be reconstructed by an orthopaedic surgeon. Read more...
Yes. A torn ACL can lead to knee instability. With each episode of instability, you run the risk of doing further damage to the joint, specifically meniscus/cartilage tears. This can lead to arthritis at a later age. See a knee orthopedic sports medicine surgeon, for the correct treatment. Read more...

Have swelling and pain in the knee, but not like the pain when I ripped my acl. What should I do? Should I exercise it right away?

Maintian Your Motion. Keep your knee moving. If your knee is repeatedly swelling this might represent a meniscus tear. These are not uncommon with acl injuries. You should see your doctor a MRI might be indicated to make a diagnosis. Read more...

Can the age of a damaged ACL in the knee be determined by a MRI scan.

Not really. The MRI is very good at saying it's torn. As with many things, not when it occurred. Read more...
Maybe. If the ACL tear is acute, then there is edema and some frayed ends in and around the ligament. After a while, there is some healing. If there is a chronic tear, but accompanied by a significant joint effusion and synovitis, then it is difficult to determine the age. An ACL tear without much effusion or edema can be classified as remote. Physical exam will confirm the diagnosis of ACL tear. Read more...
Yes. Hi Jamie, excellent ?. Diagnosing ACL tear is the first step on the MRI. They can be partial or full thickness. They can be acute or chronic (remote). MRI can make the diagnosis and should be able to make the distinctions above. It may depend on how good the MRI is and on how experienced the radiologist is, but that distinction is possible. good luck. Read more...

Had ACL reconstruction 8 months ago. Due to pain, I now need to get scar tissue reduced. How can I prevent rebuild up of scar tissue in the knee?

Scar tissue. Scar tissue develops as a result of injury to affected area, infection or surgery. Performing surgery for the sake of scar removal is often time not very helpful. It's possible that the knee has been re-injured which is causing the pain. Surgical technique is the best way to reduce scar tissue but is still a literal and figurative "double edged" sword. Read more...

Does liquid in the knee hurt? I have extreme swelling in the knee along with popping and slipping of the kneecap. I also I have pain along the acl?

Water on the knee. There are basically two kinds of situations with water on the knee. Acute injury to the knee joint or cartilage causes inflammation and swelling which is associated with pain. Chronic arthritis of the knee joints can cause acute, large, painless swelling at times when the knees are not painful. Popping slipping of the knee cap suggests a tendency to subluxation, but is not usually assocated w swel. Read more...
Yes. The liquid, which we call synovial fluid can build up pressure and hurt. The liquid is there because of the surrounding structures, cartilage that may be slipping, a torn meniscus, a torn ligament. You evalaution will look at this and you will need imaging: x-ray, ultrasound or MRI or all three to help clarify. An orhtopedic surgeon may need to do arthroscopy to see insie the knee. Read more...

What does chondrocalcinosis mean? Where are the medial collateral ligament fibers in the knee? What does it mean there is an abnormal focal region acl

Read below. Chondrocalcinosis is abnormal deposits of calcium typically at the meniscus. The medial collateral ligaments (mcl) fibers are on the inside part of the knee. An abnormal focal region of the acl means that the acl has degenerated a bit. This can happen with age (unfortunately) or it can happen after an injury. Read more...