What might a "locking" sensation in the knee indicate?

A "locking" sensation in the knee typically indicates a meniscal tear. This sensation occurs when a fragment of the torn meniscus becomes wedged between the femur and the tibia during movement. As the knee attempts to flex or extend, the presence of the torn cartilage can effectively "lock" the joint in place, preventing it from moving freely. This is often accompanied by pain and a feeling of instability in the knee. A meniscal tear can result from acute injury or degeneration over time, particularly in athletes or individuals engaged in activities that involve twisting motions.

While healthy cartilage would not cause a locking sensation, conditions like patellar dislocation can cause different types of instability and pain but typically do not result in a locking feeling. Bursitis involves inflammation of the bursa around the knee, leading to swelling and discomfort rather than a mechanical blocking sensation. Understanding these conditions helps differentiate between the causes of knee symptoms and guides appropriate management.