Think of synovial fluid as the lubricant that exists between two joints.
While research from 1971 suggested the popping sound was due to the collapse of pre-existing bubbles in joints’ synovial fluid, this finding confirms a 1947 study that found it’s actually the creation of bubbles in the synovial fluid that causes the noise. RELATED: How To Get Younger-Looking Hands The cracks were caught on MRI video so researchers could investigate what was going on, and each happened in the space of one frame (a.k.a.
A cable attached to the finger’s tip then slowly pulled until a knuckle cracked. A team of University of Alberta researchers had a study participant place his fingers into a tubular finger trap one at a time.
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