What happens inside your knee when it cracks

Added: 2026-06-01

[00:00:00]Why does your knee crack? [music] The moment it does, pressure shifts rapidly inside the joint capsule.

[00:00:06]Dissolved gases [music] come out of solution and form a bubble in the synovial fluid. That bubble collapses [music] instantly, releasing the sharp pop you hear and feel. Mechanoreceptors [music] in the surrounding ligaments fire immediately, sending a signal up the spinal cord. No [music] damage, no alarm. The fluid resets, gas dissolves back in, and [music] the joint returns to silence, ready to crack again within minutes.