ACL Tear vs Meniscus Tear: Symptoms, Differences and Treatment
An ACL tear and a meniscus tear are two common knee injuries that can occur during sports, sudden twisting movements or accidents. Although both conditions may cause knee pain, swelling and difficulty with movement, they affect different structures inside the knee joint. The anterior cruciate ligament (ACL) helps stabilise the knee, while the meniscus is a cartilage structure that cushions the bones and helps distribute weight. Some symptoms may overlap, and both injuries can occur together. A clinical examination and imaging tests, when required, can help identify the injury and guide treatment decisions.
| Comparison Factor | ACL Tear | Table Header |
|---|---|---|
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What is it? |
An injury involving a partial or complete tear of the anterior cruciate ligament, which helps stabilise the knee joint. |
A tear in one of the two menisci, the cartilage structures that cushion the thigh bone and shin bone. |
|
Structure affected
|
The anterior cruciate ligament (ACL), located inside the knee joint. |
The medial or lateral meniscus, located between the femur and tibia. |
|
Common causes |
Sudden changes in direction, pivoting, awkward landings after jumping, sudden stops or direct impact during sports. |
Twisting or rotating the knee while the foot is planted, sports injuries, direct impact or age-related tissue changes. |
|
Common symptoms |
Knee pain, swelling, a popping sensation at the time of injury and a feeling that the knee may give way. |
Knee pain, stiffness, swelling, clicking, catching or locking sensations and restricted knee movement. |
|
Swelling pattern |
Swelling may develop rapidly, often within the first few hours after an injury. |
Swelling and stiffness may develop gradually over two to three days, although the pattern can vary. |
|
Knee stability |
The knee may feel unstable, particularly during turning, pivoting or sudden changes in direction. |
The knee may feel uncomfortable or catch during movement. Some people may also experience a giving-way sensation. |
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Knee movement |
Bending or straightening the knee may be difficult due to pain and swelling. |
Movement may be restricted, particularly if a torn portion of the meniscus interferes with normal joint movement.
|
|
Diagnosis |
A medical history and physical examination, including ligament stability tests such as the Lachman test, may help identify an ACL injury |
A medical history and physical examination, including joint-line tenderness and tests such as the McMurray test, may help identify a meniscus injury. |
|
Imaging tests |
MRI is commonly used to assess the ACL and check for associated injuries. X-rays may be used to assess bone injuries. |
MRI is generally the preferred imaging test for diagnosing an acute meniscus tear. X-rays may help identify other causes of knee pain but do not show the meniscus itself. |
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Treatment options |
Treatment may include activity modification, rehabilitation and physiotherapy. ACL reconstruction may be considered depending on instability, activity level and associated injuries. |
Treatment may include rest, activity modification, pain management and physiotherapy. Selected tears may require arthroscopic repair or removal of damaged tissue. |
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Recovery and rehabilitation |
Recovery depends on injury severity and treatment. Rehabilitation after ACL reconstruction commonly takes several months and involves restoring movement, strength and knee stability. |
Recovery depends on the tear pattern and treatment. Rehabilitation after meniscus repair generally takes longer than after partial meniscectomy. |
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Can both injuries occur together?
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Yes. An ACL tear may occur with a meniscus tear or damage to other knee structures.
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Yes. A meniscus tear can occur alongside an ACL injury, particularly during sports-related knee trauma. |