Meniscus Tears: A Guide to the Six Types
A meniscus tear is damage to the C-shaped cartilage in the knee that acts as a shock absorber. The treatment approach depends heavily on which of six tear patterns you have.
A meniscus tear is an injury to one of the two C-shaped cartilage pieces in the knee joint. Each knee has a medial meniscus on the inner side and a lateral meniscus on the outer side. Together they act as shock absorbers and help stabilize the knee by distributing load across the joint.
Meniscus tears are painful and can make it difficult to work, exercise, or do everyday activities. Fortunately, the treatment is highly specific to the type of tear — and an orthopedic evaluation determines which one you have.
How meniscus tears happen
The most common mechanism is a twisting or rotational force applied to the knee — sudden stops, pivots, or changes of direction during sports, or lifting a heavy object awkwardly. Meniscus tears can also develop gradually as part of age-related wear and tear (degenerative tears).
Symptoms to watch for
Symptoms vary by tear type and location. Common features include knee pain localized to the inner or outer joint line, swelling, difficulty fully straightening or bending the knee, a sense of catching or locking, popping or clicking sounds with movement, instability or "giving way," reduced range of motion, and discomfort walking on uneven surfaces.
When a tear is caused by a sudden twisting injury, symptoms typically peak about 24 hours later. Degenerative tears usually present with a slower onset.
The six types of meniscus tears
Imaging plus exam typically identifies which of six patterns you have. The pattern guides everything about treatment.
1. Radial tears
Radial tears extend from the inner edge of the meniscus toward the outer edge, like the spokes of a wheel. They are the most common type. Unfortunately, they sit in the avascular zone of the meniscus — the area without a blood supply — so they generally do not heal on their own and often require surgical management.
2. Intrasubstance tears
Intrasubstance tears (sometimes called incomplete tears) occur within the substance of the meniscus and may not extend to the outer edges. They are typically a sign of degenerative change and are considered stable injuries. Conservative management — rest, activity modification, PT for strength and stability, and anti-inflammatory medication — usually provides the desired relief.
3. Horizontal tears
Horizontal tears occur parallel to the surface of the meniscus and can divide the meniscus into two pieces. They are often associated with degenerative changes. Tears within the vascular outer portion can sometimes be sewn together by a surgeon; centrally located horizontal tears typically cannot be repaired and require removal of the damaged tissue.
4. Flap tears
Flap tears create a flap-like fragment within the meniscus that can get caught in the joint, causing pain, swelling, and locking. They are uncommon but can usually be repaired surgically with minimal tissue removal.
5. Bucket-handle tears
Bucket-handle tears are the most serious type and often occur alongside an ACL injury. They produce a large, displaced fragment within the joint that resembles a bucket handle. Urgent surgical management is typically needed so the patient can regain knee motion.
6. Complex tears
Complex tears involve multiple patterns combined — for instance, a radial plus a horizontal tear. They can be more extensive and challenging to repair. The surgeon may suture what is repairable and trim or remove what is not.
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This article is for general information and is not medical advice for your specific situation. For diagnosis and treatment, see a board-certified specialist — call 503-245-2420 to schedule.