Is it really safe to crack your knuckles!?

Cracking knuckles is a common habit that many people indulge in. Whether you’re a habitual knuckle cracker or just curious about the science behind it, let’s explore the effects of this intriguing behavior.

1. Does Knuckle Cracking Cause Arthritis?

The myth that cracking your knuckles leads to arthritis has been widely circulated. However, scientific evidence suggests otherwise. A review published in the Swiss Medical Journal found no link between knuckle cracking and arthritis¹. Additionally, a doctor who experimented on himself over a 50-year period reported no signs of arthritis in either hand, despite cracking the knuckles on his left hand frequently¹. So, rest assured, your joints are safe from arthritis due to knuckle cracking.

2. Why Do People Crack Their Knuckles?

People crack their knuckles for various reasons:

• Sound: Some enjoy the satisfying sound that knuckle cracking produces.
• Sensation: Cracking may create a feeling of increased joint mobility, although there’s no scientific evidence to support this.
• Nervousness and Stress: Like twirling hair or wringing hands, knuckle cracking can be a way to cope with nervousness or stress.
• Habit: Once you start, it’s easy to continue unconsciously, leading to habitual knuckle cracking.

3. The Science Behind the Pop

The exact cause of the popping sound when you crack your knuckles isn’t fully understood. However, recent studies shed light on the phenomenon. Using MRI scans, researchers discovered that a cavity forms due to negative pressure when the joint is pulled apart quickly. This cavity collapse creates the audible sound². Interestingly, it takes about 20 minutes for the cavity to fully collapse, which explains why you can’t crack the same knuckle immediately after doing it once.

4. Possible Side Effects

While knuckle cracking doesn’t cause arthritis, there are some potential side effects:

• Joint Swelling: Habitual knuckle crackers may experience hand swelling.
• Reduced Grip Strength: A study found that those with a knuckle cracking habit had less grip strength in their hands³.
• Other Issues: In rare cases, excessive knuckle cracking could indicate underlying nerve illnesses⁴.

5. Conclusion

In summary, cracking your knuckles occasionally is generally harmless. However, if you find yourself cracking them excessively, consider breaking the habit. Your joints will thank you!

Remember, while the pop might be satisfying, moderation is key. So go ahead and crack your knuckles, but do it mindfully!