A knee that clicks going up stairs or crunches during a squat causes a great deal of unnecessary worry, and the noise on its own is usually meaningless — what matters is what accompanies it. Here is why knees make noise, what is benign, and where the line for checking sits.

Why Knees Make Noise

Several harmless mechanisms: the the-gas-bubbles-in-joint-fluid (the small gas releases producing audible pops from the protect-your-knees logic — the gas-bubbles), the the-tendons-moving-over-bone (the tendons and ligaments sliding over structures from the strengthening-exercises logic — the tendons-over-bone), the the-cartilage-surfaces-moving (the joint surfaces producing a grinding sensation from the squatting logic — the cartilage-surfaces), the the-it-increases-with-age-normally (the noise increasing with age without indicating damage from the strong-knees logic — the increases-normally), the the-noise-does-not-correlate-well-with-damage (the sound not reliably indicating joint problems from the protect-your-knees logic — the noise-not-damage), and the reframe (the noisy knee as usually meaningless on its own — several harmless mechanisms producing sound that does not correlate well with actual damage).

What Is Benign

Reassuring patterns: the the-noise-without-pain (the painless clicking being the reassuring pattern from the protect-your-knees logic — the noise-without-pain), the the-noise-that-has-been-there-for-years (the long-standing unchanged noise from the strong-knees logic — the long-standing), the the-clicking-on-first-movement (the noise on initial movement after sitting from the stairs logic — the first-movement-clicking), the the-symmetrical-noise-in-both-knees (the both knees behaving similarly from the protect-your-knees logic — the symmetrical), the the-no-swelling-or-instability (the absence of swelling, giving way or locking from the squatting logic — the no-swelling-or-instability), the the-full-range-of-motion-retained (the movement remaining unrestricted from the strengthening-exercises logic — the full-range-retained), and the the-it-does-not-limit-what-you-do (the the noise not affecting function from the protect-your-knees logic — the does-not-limit-function).

The When-to-Check Notes

What actually warrants attention: the the-pain-accompanying-the-noise (the pain being the meaningful symptom rather than sound from the squatting logic — the pain-with-noise), the the-swelling (the joint swelling warranting assessment from the squatting logic — the swelling), the the-locking-or-catching (the the knee catching or locking being significant from the protect-your-knees logic — the locking-or-catching), the the-giving-way (the instability or the knee giving way from the strengthening-exercises logic — the giving-way), the the-a-sudden-change-in-the-noise (the a new or changed noise pattern from the protect-your-knees logic — the sudden-change), the the-noise-after-an-injury (the noise appearing after a specific incident from the squatting logic — the after-injury), the the-strengthen-rather-than-avoid (the strengthening being more useful than avoidance regardless from the strengthening-exercises logic — the strengthen-not-avoid), and the frame (the knee noise as usually benign in isolation — with pain, swelling, locking, giving way or a sudden change being what actually warrants checking, and strengthening beating avoidance either way. Noise alone is usually meaningless — get it checked if there is pain, swelling, locking or giving way, and strengthen rather than avoid. This is general information, not medical advice.)

A knee that clicks going up stairs or crunches during a squat causes a great deal of unnecessary worry, and the noise on its own is usually meaningless — what matters is what accompanies it. Knees make noise from gas bubbles in joint fluid, tendons moving over bone, cartilage surfaces moving, an increase with age that is normal, and noise that does not correlate well with damage. Benign patterns: noise without pain, noise that has been there for years, clicking on first movement, symmetrical noise in both knees, no swelling or instability, full range of motion retained, and no limitation on what you do. Check it for pain accompanying the noise, swelling, locking or catching, giving way, a sudden change, or noise after an injury — and strengthen rather than avoid either way. This is general information, not medical advice.