ACL Tear vs. Meniscus Tear: Symptoms, Treatment and Recovery
Knee injuries can happen in an instant. You plant your foot, twist, land awkwardly, or stop suddenly—and right away, something feels wrong.
Maybe you heard a pop. Maybe your knee started swelling almost immediately. Or you can still walk, but now the joint catches, locks, or feels as if it might give way.
Two common injuries can cause these kinds of symptoms: an ACL tear and a meniscus tear. They often feel similar at first, but they affect very different parts of the knee.
An ACL tear involves a ligament that helps keep your knee stable. A meniscus tear damages one of the pieces of cartilage that cushions the knee joint. ACL tears often cause rapid swelling and instability. Meniscus tears are more likely to cause pain along the joint line, catching, or locking.
There’s also some overlap. In fact, the ACL and meniscus can be injured at the same time.
If you’re not sure what happened, an orthopedic evaluation can help identify the injured structures and determine which treatment makes sense for you.
At Arthritis & Sports Orthopaedics, our knee specialists provide nonsurgical and surgical care for ACL tears, meniscus injuries, and other sports-related knee problems in Sterling and South Riding, Virginia.
Key Takeaways
The ACL is a ligament that helps keep the knee stable.
The meniscus is cartilage that cushions the joint and helps spread pressure across the knee.
A pop, rapid swelling, and a knee that gives way may point toward an ACL tear.
Joint-line pain, catching, or locking are more commonly associated with a meniscus tear.
The ACL and meniscus can be injured during the same accident.
Symptoms alone usually aren’t enough to tell which structure is injured.
Not every ACL or meniscus tear requires surgery.
Recovery depends on the injury, treatment, other damage inside the knee, activity level, and personal goals.
At a Glance: ACL Tear vs. Meniscus Tear
What to Compare | ACL Tear | Meniscus Tear |
What is injured? | A ligament that helps stabilize the knee | Cartilage that cushions and distributes pressure in the knee |
Common injury pattern | Pivoting, cutting, sudden stopping, or awkward landing | Twisting, pivoting, or deep bending; may also develop gradually with age-related wear |
Pop at the time of injury | Common | Possible |
Swelling | Often develops quickly after the injury | May develop more gradually |
Where it hurts | Pain may be difficult to pinpoint | Often along the inner or outer joint line |
Knee giving way or instability | More characteristic | Can happen, but is less typical |
Catching or locking | Less characteristic | More common |
Trouble fully straightening the knee | Possible because of pain or swelling | May occur, especially with certain tears that cause mechanical blocking |
Can you still walk? | Often, especially after initial swelling improves | Often |
Can both injuries happen together? | Yes | Yes |
Does it always require surgery? | No | No |
How is it diagnosed? | History, physical exam, and sometimes MRI | History, physical exam, and sometimes MRI |
Recovery | Depends on nonsurgical care vs. ACL reconstruction | Depends greatly on nonsurgical care, meniscus repair, or partial meniscectomy |
Dr. David Goodwin, an orthopedic sports medicine surgeon at Arthritis & Sports, explains: “Patients often come in asking whether they tore their ACL or meniscus based on one symptom. There are clues that point us in one direction, but the history, examination, and sometimes imaging all work together to give us the answer.”
ACL vs. Meniscus: What’s the Difference?
The ACL and meniscus are both important to a healthy knee, but they don't do the same job.
The anterior cruciate ligament, or ACL, is one of the knee's main stabilizing ligaments. It helps control movement, particularly when you turn, pivot, or change direction.
The menisci are two pieces of strong, flexible cartilage that sit between the thighbone and shinbone. They cushion the joint and help spread pressure across it.
What Is an ACL Tear?
The ACL connects the thighbone to the shinbone inside your knee. It helps control forward and rotational movement and becomes especially important during cutting, pivoting, and quick changes in direction.
The ligament may be stretched, partially torn, or completely torn.
ACL injuries are common in sports that involve jumping, sudden stops, or fast changes in direction. They're not limited to sports, though. Falls and other accidents can injure the ACL, too.
What Does an ACL Tear Feel Like?
Some people hear or feel a pop as the injury happens.
Other symptoms may include:
Rapid swelling
Knee pain
Difficulty putting weight on the leg
Loss of motion
A feeling that the knee is unstable
Buckling or giving way
Once the initial pain and swelling begin to settle, instability may become the bigger issue.
You might feel fairly comfortable walking in a straight line, for example, but notice that the knee doesn't feel reliable when you turn, pivot, or change direction quickly.
Learn more about ACL injuries.
What Is a Meniscus Tear?
There are two menisci in each knee: one on the inside of the joint and one on the outside.
These pieces of cartilage help spread force across the knee while protecting the surfaces of the joint.
A meniscus may tear during a sudden twisting movement. Sports are a common setting for these injuries, but they can also happen during normal daily activities.
As meniscus tissue changes with age, it may become more vulnerable to tearing as well.
What Does a Meniscus Tear Feel Like?
It depends on the tear.
Possible symptoms include:
Pain along the joint line
Swelling
Stiffness
Clicking or catching
A feeling that something is moving inside the knee
Difficulty fully bending or straightening the knee
Pain with twisting, squatting, or pivoting
Locking of the knee
It's possible to keep walking with a torn meniscus, particularly soon after the injury.
Being able to walk doesn't necessarily mean the injury is minor.
Where Does a Meniscus Tear Hurt?
Meniscus pain is often felt along the joint line, where the thighbone meets the shinbone.
If the medial meniscus on the inside of the knee is injured, that's often where the pain is felt. A lateral meniscus tear may cause more discomfort along the outside of the knee.
Location can give your doctor a useful clue. By itself, though, it can't confirm a tear.
How Can You Tell If You Tore Your ACL or Meniscus?
Usually, you can't know for certain from symptoms alone.
There are patterns that make one injury more likely than the other, but there's enough overlap that a physical examination is often needed.
Rapid Swelling and Instability May Point Toward the ACL
An ACL tear often causes swelling relatively soon after the injury.
The knee may also feel unreliable when you turn or change direction. That sense that you can't quite trust it is an important clue.
Not every ACL injury follows the textbook pattern, however.
Joint-Line Pain, Catching, or Locking May Point Toward the Meniscus
A meniscus tear commonly causes pain along one side of the knee joint.
Some people also notice clicking, catching, or locking.
If your knee actually gets stuck and you can't fully straighten it, it should be evaluated promptly.
A Pop Can Happen With Either Injury
A pop doesn't automatically equal an ACL tear.
ACL injuries are well known for causing a popping sound or sensation, but other knee injuries—including meniscus tears—can do the same thing.
It's one piece of the story, not the diagnosis.
Dr. Matthew Griffith, an orthopedic sports medicine surgeon at Arthritis & Sports, explains: “A pop gets people’s attention, but it doesn’t tell us exactly what was injured. What happened next—how quickly the knee swelled, where it hurts, whether it locks, and whether it feels unstable—can tell us much more.”
Can You Tear Your ACL and Meniscus at the Same Time?
Yes. The ACL and meniscus can tear during the same knee injury.
A strong twisting or pivoting force doesn't necessarily stop at one structure.
The meniscus, cartilage covering the knee joint, or other ligaments can sometimes be damaged along with the ACL.
When more than one structure is injured, it may change:
The symptoms you experience
Whether surgery is recommended
Which surgery is performed
Restrictions during early rehabilitation
Your overall recovery plan
That's why an orthopedic specialist evaluates the knee as a whole rather than trying to match a single symptom to a single injury.
Which Is Worse: an ACL Tear or a Meniscus Tear?
Neither one is automatically worse.
A complete ACL tear that leaves the knee unstable can have a major impact on sports and activities that require cutting or pivoting.
Some meniscus tears can be significant, too—particularly when the knee locks or an important portion of the meniscus is damaged.
How serious either injury is depends on several factors:
The type and severity of the tear
Whether other structures in the knee are injured
Your symptoms
Your age
Your activity level
Your sport or occupation
What treatment you need
Your goals
The name of the injury matters. How that injury affects your life matters just as much.
How Are ACL and Meniscus Tears Diagnosed?
The evaluation usually begins with a simple question: What happened?
Your orthopedic specialist may ask:
Were you running, cutting, or pivoting?
Did another person or object hit your knee?
Did you hear or feel a pop?
How quickly did the swelling start?
Where does the knee hurt?
Does it catch or lock?
Does the knee feel unstable?
Can you fully bend and straighten it?
Next comes the physical examination.
Physical Examination
Your provider may check:
Range of motion
Swelling
Areas of tenderness
Knee stability
Strength
Movements that reproduce your symptoms
Orthopedic specialists also use specific examination techniques to assess the ACL and meniscus.
No single finding tells the entire story. The results are considered together.
Do You Need an MRI for an ACL or Meniscus Tear?
Not every knee injury needs an MRI.
Your symptoms and physical examination usually help guide the first steps.
An MRI may be recommended when your doctor needs a clearer view of the ACL, meniscus, cartilage, or other soft tissues inside the joint. It can also help identify injuries that occurred at the same time.
What Do Knee X-Rays Show?
An X-ray can't directly show a torn ACL or meniscus.
What it can show are things such as:
Fractures
Arthritis
Changes within the joint
Other bone-related problems
Your orthopedic specialist will decide which type of imaging, if any, is appropriate for your injury.
Do ACL Tears and Meniscus Tears Need Surgery?
Not always.
Seeing the word “tear” on an MRI can sound alarming, but a torn structure doesn't automatically need to be surgically repaired or reconstructed.
Treatment depends on the injury and the person who has it.
Does Every ACL Tear Need Surgery?
No.
Some people can manage an ACL injury with rehabilitation, particularly if the knee becomes stable enough for the activities they want to return to.
Nonsurgical treatment may include:
Physical therapy
Strengthening
Swelling control
Restoring knee motion
Balance and stability training
Activity changes when needed
Bracing in selected situations
ACL reconstruction may be considered if the knee continues to feel unstable or if you want to return to sports and activities that put significant demands on knee stability.
Other injuries inside the knee can influence the decision as well.
Factors may include:
Whether the tear is partial or complete
The amount of knee instability
Other meniscus or cartilage injuries
Age
Activity level
Sport
Occupation
Personal goals
The needs of a young athlete hoping to return to a cutting sport can be very different from those of someone whose main activities are walking, cycling, or straight-line exercise.
Does Every Meniscus Tear Need Surgery?
No.
Many meniscus tears are treated without surgery at first.
Treatment may involve:
Activity changes
Physical therapy
Strengthening
Medication when appropriate
Time followed by a gradual return to activity
Whether surgery enters the conversation depends on the tear itself.
Your doctor may consider:
Whether the tear happened suddenly or developed over time
Its location
Tear pattern
Size
Tissue quality
Your symptoms
Whether the knee locks
How you've responded to nonsurgical treatment
Other injuries in the knee
The goal is to treat the patient, not just the MRI.
Dr. Goodwin notes:“An MRI can show us that something is torn, but that’s only part of the decision. We also need to know whether the knee is stable, what symptoms the patient has, and what they need that knee to do.”
Learn more about our approach to sports medicine.
What Is the Difference Between Meniscus Repair and Meniscectomy?
If a meniscus tear does require surgery, “meniscus surgery” can mean more than one thing.
Two common approaches are meniscus repair and partial meniscectomy.
Meniscus Repair
With a meniscus repair, the surgeon works to preserve the torn tissue by securing it so it has a chance to heal.
Not every tear can be repaired.
Whether repair is possible depends on factors such as the location and pattern of the tear, its blood supply, tissue quality, and whether other structures are injured.
Because the meniscus itself needs time to heal, rehabilitation after a repair is usually more protective than recovery after damaged tissue is trimmed.
Partial Meniscectomy
During a partial meniscectomy, damaged or unstable tissue is trimmed while leaving as much healthy meniscus as possible.
Recovery is often faster than after a repair because the remaining tissue doesn't need to heal back together.
Preserving healthy meniscus matters whenever possible. The meniscus plays an important role in protecting the knee joint.
ACL Tear vs. Meniscus Tear Recovery: How Long Does It Take?
There's a wide range.
Recovery depends not only on whether the ACL or meniscus was injured, but also on how the injury is treated.
How Long Is Recovery After ACL Reconstruction?
ACL reconstruction comes with a long rehabilitation process.
Early on, the priorities are controlling swelling, regaining knee motion, and rebuilding muscle control.
As recovery progresses, rehabilitation begins to work toward:
Strength
Balance
Running
Jumping
Cutting
Sport-specific movement
Getting back to sports shouldn't depend only on how many months have passed since surgery.
Strength, movement quality, stability, confidence in the knee, and sport-specific testing all matter.
How Long Is Recovery After a Meniscus Tear?
There's no single recovery timeline for a torn meniscus.
A patient treated without surgery may recover very differently from someone who has an operation.
Even among surgical patients, the timeline changes depending on whether the meniscus was repaired or partially trimmed.
A repair generally requires more protection because the tissue needs time to heal. Recovery after a partial meniscectomy is usually quicker.
If an ACL injury is being treated at the same time, the plan may change again.
When Can You Return to Sports After an ACL or Meniscus Tear?
Returning to your sport isn't as simple as reaching a certain date on the calendar.
Before clearing you to return, your orthopedic and rehabilitation team may consider:
Pain
Swelling
Range of motion
Strength
Knee stability
Balance
Movement quality
Sport-specific movements
Confidence in the knee
The demands of the sport matter, too.
Getting back to straight-line jogging is very different from returning to soccer, basketball, football, or another activity that involves cutting, pivoting, or contact.
Our physical therapy team works with patients throughout rehabilitation to rebuild strength, movement, and function safely.
When Should You See an Orthopedic Sports Medicine Specialist?
A sore knee after a workout doesn't always mean you need to see an orthopedic specialist.
A sudden injury followed by certain symptoms is different.
Consider scheduling an evaluation if you have:
Significant knee swelling
Pain that isn't improving
Difficulty putting weight on the leg
A knee that repeatedly gives way
Trouble fully bending or straightening the knee
Catching or locking
Symptoms that continue instead of improving
Difficulty returning to your normal activities
When Does a Knee Injury Need Prompt Medical Care?
Seek prompt medical evaluation if:
Your knee is locked and you can't straighten it
You're unable to bear weight after a significant injury
Swelling is severe or rapidly getting worse
The knee looks deformed
You develop numbness in the leg or foot
Your foot becomes cold, pale, or changes color
You experienced significant trauma
If you're not sure how serious the injury is, an evaluation can help determine what should happen next.
ACL and Meniscus Treatment in Sterling and South Riding, VA
Arthritis & Sports Orthopaedics provides comprehensive knee and sports medicine care for athletes and active patients throughout Loudoun County and Northern Virginia.
Our orthopedic surgeons treat ACL injuries, meniscus tears, cartilage problems, and other knee conditions with both nonsurgical and surgical approaches.
Sports Medicine and Knee Care in Sterling, VA
Matthew H. Griffith, MD is a board-certified orthopedic surgeon with fellowship training in sports medicine and shoulder surgery.
Dr. Griffith treats athletic and traumatic knee injuries, including ligament injuries, meniscus tears, and other conditions that may require knee arthroscopy.
He sees patients at our Sterling, Virginia office.
Sports Medicine and Knee Care in South Riding, VA
David S. Goodwin, MD is a board-certified orthopedic surgeon with fellowship training in sports medicine.
He provides nonsurgical and surgical treatment for knee and sports injuries, including ligament, meniscus, and cartilage conditions.
Dr. Goodwin sees patients at our South Riding, Virginia office.
Understanding Your Knee Injury Is the First Step
ACL tears and meniscus tears often happen in similar ways, and some of their symptoms overlap. That makes it hard to know exactly what happened based on swelling, pain, or a popping sensation alone.
And a tear doesn't automatically mean surgery.
A careful evaluation can identify which structures are injured, show how the injury is affecting your knee, and help you understand the treatment options that fit your needs and goals.
If your knee is swollen, unstable, locking, or keeping you from doing the things you enjoy, request an appointment with an Arthritis & Sports Orthopaedics knee specialist in Sterling or South Riding, VA.
Frequently Asked Questions About ACL and Meniscus Tears
How can you tell if you tore your ACL or meniscus?
An ACL tear often causes rapid swelling and a sense that the knee is unstable or may give way. A meniscus tear is more likely to cause pain along the joint line, catching, or locking. There's plenty of overlap, though, and both structures can be injured at the same time. A physical examination and, when appropriate, imaging can help confirm the diagnosis.
Can you tear your ACL and meniscus at the same time?
Yes. A twisting or pivoting force strong enough to tear the ACL may also injure the meniscus, cartilage, or other ligaments in the knee. When injuries occur together, they can affect the treatment plan, the surgery performed, and the restrictions used during early rehabilitation.
Which is worse, an ACL tear or meniscus tear?
Neither one is automatically worse. A complete ACL tear may cause major instability, while some meniscus tears can lead to locking or damage important cushioning tissue in the knee. How serious the injury is depends on the type of tear, other damage inside the knee, symptoms, activity level, and treatment needed.
Can you walk with a torn ACL?
Yes. Many people can walk with an ACL tear, particularly once the first wave of pain and swelling improves. Being able to walk doesn't mean your ACL is intact. Instability may become much more noticeable when you turn, cut, or do other activities that place greater demands on the knee.
Can you walk with a torn meniscus?
Many people can. Symptoms depend on the type and location of the meniscus tear. Pain, swelling, catching, or trouble fully moving the knee may become more noticeable as you stay active.
Do you need an MRI for an ACL or meniscus tear?
Not always. Your orthopedic provider will generally start with the story of your injury and a physical examination. An MRI may be recommended to confirm an ACL or meniscus injury, better understand the tear, or look for damage to other structures when that information will affect treatment.
Which takes longer to recover from, an ACL tear or meniscus tear?
It depends on both the injury and the treatment. ACL reconstruction generally involves rehabilitation over many months. Meniscus recovery varies more: recovery after a partial meniscectomy is often quicker, while a meniscus repair requires more time for the tissue to heal. Treating an ACL and meniscus together can change the timeline again.
