6 doctors weighed in:
What is the acl, and what does it do in the knee?
6 doctors weighed in

Dr. Thomas Deberardino
Orthopedic Surgery
2 doctors agree
In brief: 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).

In brief: 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).
Dr. Thomas Deberardino
Dr. Thomas Deberardino
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1 comment
Dr. Ron Jones
Great adding the image. Nice touch.
Dr. Thomas Kennedy
Orthopedic Surgery
1 doctor agrees
In brief: 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.

In brief: 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.
Dr. Thomas Kennedy
Dr. Thomas Kennedy
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Dr. John McDonald
Orthopedic Surgery
In brief: 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.

In brief: 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.
Dr. John McDonald
Dr. John McDonald
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