Why does knee osteoarthritis cause knee clicking and grinding?

Most people with Knee Osteoarthritis notice knee clicking and grinding when uneven joint surfaces and altered movement create sounds during bending. Knee Clicking and Grinding is a very common presentation of Knee Osteoarthritis.

Cartilage helps the knee move with low friction. With osteoarthritis, cartilage and the shape of the joint surfaces can change. As the knee bends or straightens, these surfaces may move less smoothly, producing a crunching or rubbing sensation called crepitus. Tendons and ligaments can also shift over nearby structures and make a click. Sound alone does not show how much discomfort or joint change a person has. The more useful clues are pain, swelling, loss of movement, locking, or a change in function.

Notice when the sound occurs and whether it comes with pain, swelling, or catching. Keep the knee moving with comfortable activities, and avoid repeatedly forcing a painful bend. Physiotherapy can address thigh and hip strength, flexibility, movement habits, and load management. A clinician can review footwear, exercise technique, and whether another cause should be considered. Do not try to force the joint to click or use vigorous manipulation when it hurts.

Book an assessment if new sounds are accompanied by ongoing pain, swelling, reduced movement, or difficulty using the leg. Seek urgent care after a twisting injury if the knee becomes locked, gives way repeatedly, swells quickly, or cannot bear weight. Fever with a hot, red, swollen knee also needs prompt medical attention.

Ask whether your sounds are consistent with osteoarthritis, which movements are safe, and whether physiotherapy could improve function. Ask what symptoms would warrant imaging or a faster review.