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Why do my knees make so much noise?!?

May 12, 2017

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Why do my knees make so much noise?!?

May 12, 2017

 

As we age our body starts to make strange popping, clicking, and other such noises as we move. Many patients we see at Haven Physical Therapy have wondered what the noise is and if it’s a bad thing.

 

The noise of popping/clicking of the joints is known as “crepitus” in the medical field.

 

Crepitus is a poorly understood symptom that creates negative emotions, inaccurate beliefs about what it is and what causes it and ultimately leads to altered behaviour such as avoiding squatting or kneeling.

 

A study in Musculoskeletal Science and Practice found that most people who have cracking of the joints have a negative experience with healthcare professionals…. Which is unfortunate because at Haven Physical Therapy we want you to feel better about your body, not worse.

 

Is crepitus a bad thing?

NO! Crepitus is a normal part of being human. Studies have shown that up to “99% of a cohort of subjects with no pain had patellofemoral crepitus” (Mccoy et al 1987).

 

How fascinating!! 99% of people in the study who had no pain had positive clicking of the knee. This shows that just because your knees make noise this isn’t a bad thing!


If pain occurs along with the crepitus then we are here to help! You can get a free injury consultation to help you better understand what the problem may be (or if there is even a problem).

 

Click HERE to book you Free Consultation.

 

The actual noise of the crepitus may be caused by several different things.

 

One source may be the tendons moving over bony protuberances. This noise is usually more hollow but don’t worry about the tendon becoming damaged as it rolls over the bone because this rarely is an issue.

 

Crepitus can also cause a loud noise similar to when you pop your knuckles. This is theorized to be caused by the collapse of gas bubbles inside the joint.

**the good news is that knuckle cracking doesn’t cause arthritis! **

(Read the study here: Castellanos and Axelrod, 1990)

 

A clunk noise can be explained by slip-stick phenomenon. Stick-slip can be described as surfaces alternating between sticking to each other and sliding over each other. A good example of the stick-slip phenomenon occurs when musical notes are played with a glass harp by rubbing a wet finger along the rim of a crystal wine glass.

 

The most common source of crepitus we are asked about occurs when someone is bending the knee with some weight on it (for example when you go from sitting to standing). This sounds more like a fine grating crepitus. This noise is caused by normal fluid flow through slightly rough retropatellar (behind the knee cap) surface.

 

As you can see, your body is actually normal if it pops and clicks as you move throughout your day. Just because you make noise doesn’t mean you are “getting too old” for physical activity.

 

If you’re struggling to do the things you used to love doing, we are here to help.

 

Book your Free Consultation Today