Grinding

Crackling

Clicking

Popping

These sounds are sometimes called crepitus.

Not every clicking or popping sound means that the knee is damaged. Healthy joints can also make noises.

The concern is greater when unusual sounds occur together with pain, swelling, stiffness, or reduced movement.

5. Reduced Range of Motion

As knee problems progress, movement can become increasingly difficult.

You may find it harder to fully bend or straighten your leg.

Simple activities such as getting out of a chair, climbing stairs, or getting into a car may become uncomfortable.

Loss of mobility can then create another problem: reduced physical activity.

When people move less because of knee pain, the muscles surrounding the joint can become weaker. That weakness can make everyday movement even more difficult.

6. Changes in the Way You Walk

Severe knee problems can affect your gait.

A person may begin favoring one leg because putting weight on the painful knee is uncomfortable.

Over time, this can change how forces are distributed through the hips, ankles, and opposite knee.

Walking differently doesn't necessarily mean that a person has osteoarthritis, but a persistent change in gait should be discussed with a healthcare professional.