Diagnosis and symptoms6 min read
Meniscus tear symptoms: which findings distinguish it
The meniscus is the crescent-shaped cartilage that cushions and distributes load in the knee. When it tears, the resulting picture is separated from other knee problems by several distinct findings.
Distinguishing symptoms
The most typical finding is sharp, pinpoint pain when the knee is twisted while bent. It is felt along the joint line on the inner or outer edge of the knee.
When a torn fragment catches in the joint, the knee will not fully straighten or bend; patients describe this as 'locking'. Locking is a fairly specific finding for a meniscus tear.
Swelling usually develops gradually, hours after the injury. Rapid, tense swelling at the moment of injury points more toward a ligament injury or bleeding into the joint.
Mechanism of injury and age
In young, active people meniscus tears usually occur during a sudden twist. The body rotating while the foot is planted creates the typical knee-twisting mechanism.
Over the age of forty, a tear can appear without notable trauma. With age the meniscus dries and loses elasticity, and an ordinary movement such as squatting or picking something off the floor can be enough.
This distinction directly affects the treatment decision. Traumatic and degenerative tears are managed differently, and in the second group the contribution of surgery is markedly more limited.
How the diagnosis is made
Diagnosis rests primarily on history and clinical examination. Joint-line tenderness, twisting tests and restriction of full extension or flexion are assessed together.
MRI shows the location, type and size of the tear. An MRI finding alone does not determine treatment, however: a significant proportion of people over forty have meniscus tears with no symptoms at all.
What is decisive in assessment is therefore not the tear on the image but the limitation the person experiences. The decision comes from interpreting the two together.
Key points
- The most typical finding is sharp joint-line pain on twisting.
- Locking is a fairly specific finding for a meniscus tear.
- Meniscal swelling usually develops slowly over hours.
- Over forty, a tear can appear without notable trauma.
- A tear on MRI alone does not determine the treatment decision.
Frequently asked questions
Does a meniscus tear heal on its own?
The outer rim of the meniscus has a blood supply and tears there can heal. The inner zone has none, so tears there do not repair themselves, though symptoms can recede markedly as the surrounding muscles strengthen.
If I can walk, is there no tear?
Being able to walk does not exclude a tear. Walking is possible in most meniscus tears; symptoms appear more with squatting, stairs and twisting.
Is knee clicking a sign of a meniscus tear?
Not on its own. Painless clicking is common in the joint and not considered significant. If clicking comes with pain, catching or locking, assessment is required.
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This content is for information only and does not replace medical diagnosis or treatment. Response to treatment varies between individuals. Please consult a healthcare professional about your symptoms.