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Clicking or popping in the knees when we are bending or straightening them is quite a common occurrence. Medically, this clicking of the knees is known as knee crepitus, which means a noisy joint. Some of the common causes of knee clicking when you bend or straighten them include stress or injury to the knee joint or the leg, gas bubbles, ACL or MCL injury, arthritis, chondromalacia patella, runners knee etc . Depending on the cause of knee clicking and the extent of injury, treatment is done.