What Causes Ligament Tears in the Knee, and When Should It Be Evaluated by an Orthopedic Specialist in Dallas?

Knee injuries can happen in an instant. You plant your foot to change direction, land awkwardly after a jump, take a hit during a game, or simply twist your knee stepping off a curb. Sometimes the pain improves with rest. Other times, the injury involves one of the ligaments responsible for keeping the knee stable.

So, what causes ligament tears in the knee, and when should you see an orthopedic specialist?

Knee ligament tears are commonly caused by sudden twisting, pivoting, direct impact, awkward landings, or hyperextension of the knee. An orthopedic evaluation is especially important if you experience significant swelling, hear or feel a pop, cannot comfortably bear weight, or feel as though the knee is unstable or giving way.

Determining which ligament is injured—and how severely—is important for choosing the appropriate treatment and safely returning to normal activity.

What Are the Main Ligaments in the Knee?

Four primary ligaments help stabilize the knee.

Anterior Cruciate Ligament (ACL)

The ACL is located inside the knee and helps control forward movement and rotation of the shin bone.

ACL tears are particularly common in sports involving sudden changes in direction, jumping, or pivoting.

Posterior Cruciate Ligament (PCL)

The PCL is also located inside the knee and helps prevent the shin bone from moving too far backward.

PCL injuries frequently result from a strong force to the front of the knee, such as hitting the dashboard during a vehicle accident or landing directly on a bent knee.

Medial Collateral Ligament (MCL)

The MCL runs along the inside of the knee and helps protect it from forces pushing the knee inward.

MCL injuries commonly occur when the outside of the knee receives a direct blow.

Lateral Collateral Ligament (LCL)

The LCL runs along the outside of the knee and helps stabilize it against forces pushing the knee outward.

LCL injuries are less common but may occur during sports, falls, or other trauma.

What Are the Most Common Causes of Knee Ligament Tears?

Knee ligament injuries can occur during sports, work, exercise, accidents, or everyday activities.

Common causes include:

• Sudden changes in direction
• Pivoting while the foot remains planted
• Landing awkwardly from a jump
• Suddenly stopping while running
• Direct blows to the knee
• Hyperextending the knee
• Falls
• Motor vehicle accidents
• Contact sports

Football, basketball, soccer, skiing, and other activities involving rapid changes in direction can place considerable stress on the knee ligaments.

However, you don’t have to be an athlete to tear a knee ligament. A simple misstep or awkward twist can sometimes be enough.

What Does a Torn Knee Ligament Feel Like?

Symptoms depend on which ligament is injured and whether the tear is partial or complete.

You may experience:

• Sudden knee pain
• Swelling
• Bruising
• Limited range of motion
• Difficulty walking
• Tenderness
• A popping sensation at the time of injury
• Knee instability
• A feeling that the knee may buckle or give way

Some ligament injuries cause immediate symptoms, while others become more noticeable over the hours following the injury.

What Symptoms Should Not Be Ignored?

Significant swelling, instability, inability to bear weight, severe pain, loss of motion, or a popping sensation at the time of injury should be evaluated.

You should also consider seeing an orthopedic specialist if:

• The knee repeatedly gives way
• Swelling develops quickly after the injury
• You cannot fully bend or straighten your knee
• Pain isn’t improving with rest
• You cannot return to normal activities
• The knee feels unstable when walking
• Symptoms return when you attempt exercise or sports

Continuing to participate in activities on an unstable knee can potentially lead to additional injury.

Does Hearing a Pop Mean You Tore Your ACL?

Not necessarily, but a popping sound or sensation followed by swelling and instability is commonly associated with ACL injuries.

Other knee injuries can also cause popping.

The combination of symptoms and a physical examination is more useful than any single symptom for determining what happened.

Can You Still Walk With a Torn Knee Ligament?

Sometimes.

Being able to walk does not necessarily mean the ligament is intact.

Some people with partial or even complete ligament tears can still bear weight after the initial injury. However, they may notice instability, swelling, pain, or difficulty with movements that require turning or changing direction.

If the knee feels unstable despite being able to walk, an orthopedic evaluation is appropriate.

How Is a Knee Ligament Tear Diagnosed?

An orthopedic specialist will typically begin by asking how the injury occurred and reviewing your symptoms.

A physical examination may assess:

• Knee stability
• Range of motion
• Swelling
• Tenderness
• Ligament function
• Ability to bear weight

X-rays may be used to evaluate the bones and rule out certain fractures or other problems.

An MRI may be recommended when more detailed images of the ligaments, cartilage, meniscus, and other soft tissues are needed.

Are All Knee Ligament Tears the Same?

No.

Ligament injuries are commonly described according to severity.

A mild sprain may involve stretching of the ligament without significant tearing. A partial tear damages some of the ligament fibers, while a complete tear means the ligament has been torn through.

The severity of the tear is only part of the treatment decision. Your age, activity level, knee stability, associated injuries, and personal goals also matter.

Can a Torn Knee Ligament Heal Without Surgery?

Some knee ligament injuries can be successfully treated without surgery.

Nonsurgical treatment may include:

• Rest
• Ice
• Activity modification
• Bracing
• Anti-inflammatory medication when appropriate
• Physical therapy
• Strengthening and mobility exercises

Certain MCL injuries, for example, frequently respond well to conservative treatment.

The treatment of ACL and other significant ligament injuries is more individualized.

When Is Surgery Considered for a Knee Ligament Tear?

Surgery may be considered when a ligament injury causes persistent instability or prevents a patient from safely returning to desired activities.

Factors that may influence the decision include:

• Which ligament is torn
• Whether the tear is complete
• Knee instability
• Other knee injuries
• Sports or occupational demands
• Age and general health
• The patient’s goals

Some injuries involve more than one ligament or occur along with meniscus or cartilage damage, making proper diagnosis particularly important.

Can Physical Therapy Help a Knee Ligament Injury?

Yes. Physical therapy can play an important role in both nonsurgical treatment and recovery following surgery.

Rehabilitation may focus on:

• Reducing swelling
• Restoring range of motion
• Strengthening muscles around the knee
• Improving balance
• Restoring stability
• Improving movement mechanics
• Preparing for a return to work or sports

The rehabilitation program should be based on the specific ligament injury and treatment plan.

What Happens If a Torn Knee Ligament Is Left Untreated?

Not every ligament injury requires surgery, but an unstable knee should not simply be ignored.

Persistent instability can interfere with walking, exercise, sports, and everyday activities. Repeated episodes of the knee giving way may also place additional stress on other structures within the joint.

Getting an accurate diagnosis allows you to understand the injury and make an informed treatment decision.

Frequently Asked Questions

What is the most commonly injured knee ligament?

The ACL and MCL are among the most commonly injured knee ligaments, particularly during athletic activities.

Can a knee ligament tear heal on its own?

Some ligament injuries can heal or become functionally stable with appropriate nonsurgical treatment. Others may require surgical treatment depending on the ligament, severity, instability, and patient’s activity goals.

Should I see an orthopedic specialist if my knee is swollen after an injury?

Significant or rapidly developing swelling following an injury warrants evaluation, particularly when accompanied by pain, instability, or difficulty bearing weight.

Do all ACL tears require surgery?

No. Treatment is individualized. Activity level, instability, associated injuries, age, and personal goals all influence whether nonsurgical treatment or ACL reconstruction may be appropriate.

How long does a knee ligament injury take to heal?

Recovery varies considerably depending on the ligament involved, severity of the injury, treatment selected, and rehabilitation requirements.

When should I see an orthopedic specialist for knee pain in Dallas?

If knee pain follows an injury and is accompanied by significant swelling, instability, difficulty walking, loss of motion, or symptoms that aren’t improving, an orthopedic evaluation can help determine the cause.

Don’t Ignore a Knee That Feels Unstable

A knee ligament tear isn’t always obvious immediately after an injury. You may still be able to walk, and the initial pain may even improve.

Instability is an important warning sign.

If your knee buckles, gives way, remains swollen, or doesn’t feel dependable when you return to normal activities, determining which structures were injured is important.

Early diagnosis can help establish the appropriate treatment plan and give you a clearer path toward safely returning to the activities you enjoy.

Schedule a Knee Evaluation With POSMC

POSMC specializes in diagnosing and treating knee conditions for patients in the Dallas–Fort Worth area. Treatment for a knee ligament injury depends on the ligament involved, severity of the tear, associated knee damage, and each patient’s individual goals.

If you’ve injured your knee and are experiencing persistent pain, swelling, limited motion, or instability, schedule an orthopedic evaluation to determine what’s causing your symptoms and discuss your treatment options.