Anterior Cruciate Ligament information

Anterior Cruciate Ligament is one of the main intracapsular ligament which is most commonly get injured in sports or in other traumatic events.

To understand ACL injury or problems, you have to understand ligament anatomy better. So let us start with anatomy.

If you have not gone through knee anatomy pages like knee muscles, bones, ligaments then please go through those pages first.

Assuming you know about knee anatomy I will tell you in detail about ACL here.

Anterior Cruciate Ligament Anatomy

Anterior Cruciate Ligament

Knee joint is made up of following knee bones.

  • Lower end of femur
  • Upper end of tibia

The ACL originates from distal femur's deep notch.The proximal fibres of ACL fans along the medial wall of lateral femoral condyle, deep within the intercondylar notch.

It runs inferiorly, medially and anteriorly to attach on tibial plateau. At insertion it attach with anterior horn of medial meniscus.

ACL has two bundles —the anteromedial and the posterolateral, named according to their insertion on tibial plateau.

The ACL has a length variations from 28-45 mm but 38 mm is an average length.

Width is around 10 mm although range is 7-13 mm.

Tibial nerve is the source of nerve supply to the ligament along with blood supply from genicular artery which is branch of femoral artery.

It has proprioceptive receptors which helps in sending joint sensation to the brain and thus increasing movement awareness to the person.

Bio-mechanics of Anterior Cruciate ligament

As we know ACL has two bands:

  • Small anteromedial band- tight in flexion
  • Large posterolateral band- tight in extension

The main function of ACL is to prevent excessive anterior transition of tibia over femur.

Not only they prevent excessive anterior transition but also tibial medial and lateral rotation. They also prevent excessive medial and lateral forces on knee joint.

Along with knee joint muscles they help in lower limb stabilization during weight bearing position.

Thus combined action of knee joint muscles and Ant cruciate ligament helps in proper alignment and correct weight bearing by person.

This is enough basic information for you to understand knee injury related to ACL.

Go back to Knee Anatomy from Anterior Cruciate Ligament.

Go back to Knee replacement from Here.


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