02/04/2026
If you are interested in seeing the cracking event at high speed, this new blog shows the experimental setup and a video capture
Joint cracking has been debated for decades—bubbles collapsing, tissues snapping, or something else entirely.
In this post, I share what we learned from controlled joint-cracking experiments conducted at UBC, where force, sound, motion, and high-speed imaging were captured together.
The findings help explain why joints crack, why some cracks are louder than others, and why there’s a refractory period afterward—all from a fluid-mechanics perspective.
If you’re interested in how joints actually behave under load, you may find this useful. :)
Joint cracking occurs when a fluid cavity forms inside a synovial joint. Laboratory models and imaging explain why joints crack and reset.