What Are the Symptoms of a Meniscus Injury?

Meniscal injuries commonly present with symptoms such as knee pain, joint swelling and effusion, catching or locking during flexion/extension accompanied by audible popping, weakness in lower-limb strength, and restricted joint mobility. These injuries are typically caused by cartilage damage resulting from joint wear-and-tear or external trauma (e.g., direct impact), which persistently interferes with normal walking and movement of the lower limb. Frequent episodes of knee discomfort significantly impair mobility; prompt medical evaluation—including imaging studies—is therefore essential.

1. Knee Pain: Pain arises when the injured area is compressed or subjected to friction. It intensifies markedly during activities involving squatting, ascending slopes, or twisting the knee. Discomfort is mild during slow walking on level ground and only temporarily alleviated by rest. Pain recurs sharply upon weight-bearing or exertion.

2. Joint Swelling and Effusion: Cartilage damage triggers intra-articular fluid accumulation. Swelling gradually develops within several hours post-injury; palpation reveals fullness and tension over both sides of the knee. Accumulated fluid elevates the knee’s contour and impedes normal flexion and extension.

3. Catching, Locking, and Popping: During knee movement, damaged cartilage surfaces rub against each other, producing distinct popping sounds. In severe cases, the joint may suddenly lock, rendering it immobile until gentle oscillation of the leg “unlocks” it—often accompanied by sharp, stabbing pain that prevents normal force generation.

4. Lower-Limb Weakness: Compromised cartilage reduces joint stability, causing the leg to feel unstable or “give way” during stair climbing or walking. Patients often avoid bearing weight on the affected leg, leading over time to mild atrophy of the thigh muscles and insufficient unilateral support during ambulation.

5. Restricted Joint Mobility: Severe injury may prevent full knee flexion or extension. Large-range movements—such as deep squatting, rising from a seated position, or twisting—are difficult to perform. Forced stretching of the joint further stresses the torn meniscus, exacerbating internal wear and pain, thereby limiting daily functional capacity.

To promote recovery and minimize further damage, avoid high-load activities such as deep squatting or stair climbing. When walking, consider using a knee brace for joint stabilization. Limit prolonged standing or walking, and consistently perform gentle straight-leg raises to strengthen supporting musculature, protect cartilage, and slow down joint degeneration.