I recently had surgery on my ankle and have started walking again. I find when I stretch or move it, it cracks and pops a lot more then it ever did before. This doesn’t cause pain, and sometimes even feels nice, but what makes the noise?
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Finger joint popping, back popping and most other “popping”, almost always synovial fluid. However, post surgical joints, aging knees, elbows and shoulders: might be crepitus. Crepitus is the grinding noise of bone/cartilage along rough areas or cartilage. It can be painful. In short: “pop” probably nitrogen bubbles in synovial fluid (not to be confused with “the bends”, “grinding” probably crepitus.
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