Overview
A meniscus tear is injury to the cartilage cushion inside the knee. It can occur with twisting injuries or degenerative changes.

Symptoms
Pain along the joint line, swelling, locking, catching, or limited motion.

Diagnosis
Physical exam and MRI if needed.

Treatment
Rest, ice, physical therapy, and activity modification for many tears. Arthroscopic surgery may be needed for displaced tears or persistent symptoms.

When to seek care
Locking, instability, or significant swelling should be evaluated.