You walk up the stairs and at every step you hear it: snap, snap, snap. Or you sink through your knees for a squat and it sounds like there is gravel in your joint. The sound of a creaking knee can be quite disconcerting. Many people we see at Fysio Fitaal worry that their joint is ‘worn out’ or that something is breaking with every movement.
Fortunately, this is rarely the case. A creaking knee often sounds worse than it is. In most cases, it is a harmless phenomenon that comes with moving the human body. However, when the sound is accompanied by pain or swelling, it is wise to be alert. In this article, we explain exactly what these sounds are and when to take action.
In the medical world, we call the creaking, crackling or snapping of a joint ‘crepitus’. This word is derived from the Latin crepitare, which means rattling or creaking. It is a collective term for all the sounds your joints make during movement. It can feel like a slight vibration under your hand when you put it on your knee while bending, or sound like a loud ‘pop’. It is important to note that crepitus in itself is not a diagnosis, but a symptom or phenomenon that can have several causes.
There are several reasons why your knee makes noise, and most of them are purely mechanical or physiological. A common cause is the so-called cavitation effect. The synovial fluid (synovia) contains dissolved gases such as nitrogen and carbon dioxide. When the pressure in the joint suddenly changes due to rapid movement, these gases form bubbles that then ‘snap’. This is the same mechanism as when you snap your fingers. This sound is completely harmless and does not hurt.
Another cause lies in the interplay between tendons and bones. Around your knee are various tendons and ligaments that slide over protruding bone parts when moving. Sometimes such a tendon slips out of place or gets caught briefly behind a bone point, only to shoot back with a ‘snap’. We often compare this to a guitar string that you tighten and release. This too is generally harmless, as long as it does not cause irritation or pain.
When the sound sounds more like ‘sand in the engine’ or scraping paper, there may be changes in the cartilage. The smooth surface of the cartilage behind the kneecap or in the joint itself may become more rough over the years. When rough surfaces slide over each other, it produces the typical crackling sound. While this is often associated with wear and tear (osteoarthritis), it does not automatically mean that you are in pain or cannot move.
This is the most frequently asked question in our practice. The short answer is: usually not. We use a simple rule of thumb here. Does your knee creak but you have no pain, no swelling and no locking symptoms (where the knee locks up)? Then it is physiological crepitus. This is normal and requires no treatment. You don't need to adjust your activities or sports for this. In fact, exercise is actually good to keep the joint lubricated.
The situation changes when the cracking is accompanied by pain. If you feel a shooting pain at the moment of the ‘snap’, or if the knee becomes thick and warm after exertion, it is a signal from the body that something is not right. We call this pathological crepitus. In this case, there may be a meniscus injury, cartilage damage or an irritated tendon. With these signals, we recommend contacting a physiotherapist for a proper diagnosis.
Many people notice the cracking especially during specific movements such as climbing stairs, squatting or lunges. This can be logically explained from biomechanics: during these movements, a lot of pressure is put on the joint between the kneecap (patella) and the upper leg (femur). If the kneecap does not track quite nicely, this can cause friction and noise.
When this is accompanied by pain at the front of the knee, we often refer to it as the Patellofemoral pain syndrome (PFPS). This is a common complaint where the alignment of the kneecap is disturbed, often due to an imbalance in the muscles of the hip or thigh. Although this can be painful and annoying, it is excellent to treat with the right physiotherapy guidance.
Are you suffering from a painful creaky knee? At Fysio Fitaal we always start with a comprehensive intake. Because we want to know what exactly is causing the creaking, we can use ultrasound if necessary. This allows us to immediately see if there is fluid accumulation, tendon irritation or bone surface abnormalities.
Treatment rarely focuses on ‘getting the knee still’, but on improving function and reducing pain. If the cause is misalignment of the kneecap, we work on strengthening the gluteal and thigh muscles (quadriceps). This improves the control of the leg and reduces the pressure behind the kneecap. For general knee problems We make a personalised plan so you can move, play sports and climb stairs with confidence again.
Is your knee creaking and you don't trust it, or are you in pain while moving? Don't keep running with it. At Fysio Fitaal, we are happy to look at it with you. Simply make an appointment at one of our locations in Tilburg (Reeshof, West, Noord or Zuid) and we'll help you get back on track quickly.
When squatting, the pressure behind the kneecap increases enormously (up to seven times your body weight). If the cartilage is a bit rougher or the kneecap does not track perfectly, you will hear it immediately during this heavy load. Without pain, this is not a problem.
No, it won't hurt. A creaking knee without pain is almost always harmless. It is not a sign that your joint is wearing out from movement. You can continue to do everything you are used to.
If there is no pain, there is no need to do anything. Is there pain or irritation, though? Then it often helps to strengthen the muscles around the knee and hip. Strong muscles cushion the blows and provide better guidance to the joint.
Osteoarthritis (wear and tear) is often accompanied by crepitus, which sounds like crackling or creaking (like gravel). However, not everyone with crepitus has osteoarthritis, and not everyone with osteoarthritis has creaky knees. Osteoarthritis is never diagnosed on the basis of sound alone.
Yes, please do! Movement creates synovial fluid, which acts as a lubricant for your knee. ‘Motion is lotion’ we often say. If you can exercise pain-free, squatting is no reason to stop.
Especially with knee problems, it is imperative to get a good picture of the...
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