Knee Care
ACL and meniscus injuries: symptoms and treatment.
ACL and meniscus injuries commonly occur during twisting, pivoting, landing, or contact. Because these structures serve different roles—and may be injured together—treatment begins with an accurate diagnosis and a clear understanding of your activity goals.
When to schedule an evaluation
- A pop followed by swelling after a twisting injury
- The knee gives way or feels unstable
- Joint-line pain, catching, or locking
- Difficulty fully bending or straightening the knee
- Pain or swelling that limits sports or daily activity
Understanding the Injury
Two important structures with different jobs.
The anterior cruciate ligament, or ACL, helps control forward movement and rotation of the knee. An ACL tear can lead to instability, particularly with cutting, pivoting, or sudden changes of direction.
The menisci are two C-shaped pads of cartilage that distribute load and help protect the knee. A meniscus tear may cause pain, swelling, catching, or restricted motion. ACL and meniscus injuries can occur during the same event.
Common Patterns
How ACL and meniscus injuries may present.
ACL tear
Athletes may feel or hear a pop, develop swelling, and experience instability or giving way when changing direction.
Meniscus tear
Symptoms may include pain along the joint line, swelling, catching, locking, or discomfort with squatting and twisting.
Combined injury
An ACL tear may occur with meniscus, cartilage, or other ligament damage. Identifying associated injuries is important when planning treatment.
Evaluation
Evaluation includes a review of the injury, swelling, instability, mechanical symptoms, and activity goals. The examination assesses motion, ligament stability, areas of tenderness, and meniscus signs.
X-rays help evaluate the bones and joint. MRI may be recommended to confirm an ACL or meniscus tear and identify cartilage or additional ligament injuries when the result will affect treatment.
Early treatment
Initial care may include activity modification, ice, compression, medication when medically appropriate, and physical therapy to reduce swelling and restore motion and strength.
Prompt evaluation is particularly important when the knee remains locked, swelling is substantial, weight bearing is difficult, or the knee repeatedly gives way.
ACL Treatment
Nonsurgical care or reconstruction.
Some people with an isolated ACL injury can function well with rehabilitation and activity modification, especially when the knee is stable during desired activities. Reconstruction may be considered for athletes returning to pivoting sports, patients with recurrent instability, and people whose work or activities require a stable knee.
ACL reconstruction uses a graft to replace the torn ligament. Graft choice, associated injuries, age, sport, and individual goals are discussed as part of shared decision-making.
View the ACL reconstruction animation →Meniscus Treatment
Protecting healthy meniscus tissue.
Not every meniscus tear requires surgery. Symptoms, tear pattern and location, age, activity level, arthritis, and the presence of an ACL injury all influence treatment.
When surgery is appropriate, preserving meniscus tissue is preferred whenever the tear has a reasonable opportunity to heal. Repair can protect the meniscus but requires a more protective rehabilitation. When a symptomatic torn fragment cannot be repaired, limited trimming may be considered.
View meniscus procedure animations →Recovery and Return to Activity
Rehabilitation is individualized.
Recovery depends on the structures injured and the treatment performed. Rehabilitation progresses through swelling control, restoration of motion, strength, balance, running, agility, and sport-specific activity. After ACL reconstruction, return-to-sport decisions should consider healing, strength, movement quality, functional testing, confidence, and the demands of the sport—not time alone.
Meniscus repair usually requires more protection early than a partial meniscectomy because the repaired tissue needs time to heal. Your specific weight-bearing, motion, work, driving, and sports restrictions will be reviewed after treatment.
Frequently Asked Questions
Common questions about ACL and meniscus injuries.
Does every ACL tear require surgery?
No. The decision depends on knee stability, associated injuries, activity demands, age, and personal goals. Rehabilitation is important with either surgical or nonsurgical treatment.
Does every meniscus tear require surgery?
No. Some tears can be observed or treated with rehabilitation. Persistent mechanical symptoms, certain acute tears, and associated ligament injuries may make surgery more appropriate.
Can the ACL and meniscus tear together?
Yes. The force that tears the ACL can also injure a meniscus, cartilage, or another ligament. The complete injury pattern guides treatment.
When can I return to sports?
Return varies by injury and treatment. Clearance is based on healing, strength, motion, functional testing, movement control, and readiness for the demands of the sport.
Additional Patient Education
Trusted independent resources.
Knee pain or instability keeping you from being active?
Call for appointment scheduling and location information.
Medical review: Michael C. Stanton, M.D. · September 2026
This information is for general educational purposes and does not replace an evaluation or individualized medical advice.