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A member asked:
Why do knees crack ( like cracking finger knuckles)?
2 doctors weighed in across 2 answers
This cracking sound is fairly common, it can happen at all ages, made by the movement of the periarticular structures such as the ligament rubs against a bony prominence when you walk up stair or bend your knee.
Answered 10/18/2021
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Air is being pushed out of the joint
Answered 10/22/2021
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