ACL Injury (Anterior Cruciate Ligament Tear)

The Anterior Cruciate Ligament (ACL) is one of the strongest ligaments inside the knee joint.
It keeps the knee stable during walking, running, jumping and movements that involve sudden turns, pivoting or change of direction.
That is why ACL injuries are especially common in people who play sports.

Where Is the ACL Located?

The ACL lies deep inside the knee joint and connects the tibia (shin bone) to the femur (thigh bone).
It has two parts — the anteromedial (AM) and posterolateral (PL) bundles.
These bundles work together to control forward movement of the tibia and stabilize the knee during rotation.

What Does the ACL Do?

The ACL prevents the tibia from sliding forward beyond its normal limit.
It also keeps the knee steady when the body rotates or changes direction.
Because of this role, the ACL is vital in sports like football, basketball, badminton and athletics.

How Does an ACL Tear Happen?

An ACL tear usually occurs due to a twisting force on a slightly bent knee.
It often happens without direct contact.

Common causes include:

• Sudden change of direction while running
• Landing awkwardly after a jump
• A fall where the knee turns unexpectedly
• Sudden stop while sprinting
• Playing sports like football, basketball, badminton
• Road accidents, especially skidding on a two-wheeler

Some patients hear a “pop” or feel the knee giving way at the time of injury.

What Are the Symptoms?

Symptoms may start immediately or appear weeks later.
People often describe:

• A feeling that the knee suddenly “gives way”
• Instability on stairs or uneven surfaces
• A buckling or twisting sensation while walking
• Pain and swelling after the injury
• Reduced confidence in the knee during daily tasks

In some cases, pain may be mild but the knee feels weak or unreliable.

What Should You Do If You Suspect an ACL Tear?

See an orthopedic specialist as early as possible.
The doctor will examine the knee and perform specific tests like:

• Lachman Test
• Anterior Drawer Test

If an ACL tear is suspected, an MRI scan is advised to confirm the diagnosis and look for related injuries such as meniscus tears or cartilage damage.

Treatment Options

Treatment is planned based on the extent of the tear, your activity level, and how much instability you feel.

Non-Surgical Care

Mild ACL sprains may improve with:

• Rest and temporary splintage
• Pain relief and swelling control
• Physiotherapy to strengthen muscles
• Activity modification
• Ultrasound guided PRP might be helpful in mild cases

This approach is suitable when the knee remains stable and daily activities are not affected.

Surgical Treatment (ACL Reconstruction)

Partial or complete tears often need surgery, especially if:

• The knee feels unstable
• You play sports
• You want to return to an active lifestyle

The procedure is a keyhole surgery (arthroscopy) called Arthroscopic ACL Reconstruction, where the damaged ACL is replaced using a graft to restore strength and stability.

Key Message

ACL injury is common among young and active individuals.
Early diagnosis and the right treatment — whether structured rehabilitation or arthroscopic surgery — help restore confidence in the knee and allow safe return to daily activities and sports.

Timely treatment also protects the knee from future damage, especially to the meniscus and cartilage, which leads to knee osteoarthritis later on.