Knee Clicking With No Pain: What It Means and What to Do
If your knee clicks, cracks or crunches but does not hurt, swell or give way, it is usually normal. The NHS says painless clicking is normal, and large reviews of the research agree. The sound only becomes a reason to book an assessment when it comes with pain, swelling, locking or a feeling that the knee gives way. This guide explains why knees click, what the evidence says about age and arthritis, which signs matter and how to keep your knees healthy.
TL;DR
Clicking without pain, swelling or instability is common and usually harmless. The medical term is knee crepitus.
A 2025 review found that 36% of pain-free people have noisy knees, so the sound alone says little about joint health.
Get the knee checked if clicking is painful, or comes with locking, giving way, swelling or an injury. Call NHS 111 for severe symptoms.
Regular aerobic and strengthening exercise and a healthy body weight are the best-supported ways to look after a noisy knee.
If pain develops, a physiotherapy assessment at our clinics costs £76.
Table of Contents
Is knee clicking without pain normal?
Yes, in the great majority of cases. Knee clicking, popping and crunching are very common, and on their own they do not point to damage. A Royal Wolverhampton NHS patient leaflet states that creaking or clicking knee joints are common in people without knee pain and rarely a sign of harm.
The same leaflet makes a second point that surprises many people. X-rays and scans often show meniscal tears, joint narrowing and osteoarthritis in people who have no knee pain at all. A finding on a scan, like a noise from the joint, does not automatically explain how a knee feels or works.
Three features describe a harmless noisy knee:
There is no pain when the knee clicks.
There is no lasting swelling, and the knee does not feel unstable.
You can bend and straighten it fully and walk, climb stairs and squat as normal.
If all three describe your knee, the sound is most likely physiological crepitus. It is part of how a moving joint behaves.
How common are noisy knees?
More common than most people expect. A 2025 systematic review and meta-analysis in the British Journal of Sports Medicine pooled 103 studies covering 36,439 people. It found knee crepitus in 41% of the general population, and in 36% of people without knee pain. In people with knee osteoarthritis the figure was 81%.
Those numbers show two things. Clicking is very ordinary in healthy, pain-free knees. It is also more frequent in knees with osteoarthritis, which is why the combination of noise and pain deserves attention while noise alone does not.
The same review found a low-to-very-low certainty link between crepitus and osteoarthritis on X-ray. That wording matters: researchers are cautious about reading much into the sound.
Why does my knee click?
The honest answer is that nobody can pinpoint one cause. Researchers Jamon Couch and Adam Culvenor write in The Conversation that the evidence is not yet sufficient to confirm where knee crepitus comes from. The main explanations are:
Gas bubbles in the joint fluid. Movement changes pressure inside the joint, and small bubbles can form and pop.
Tendons or ligaments moving over bone. A tendon can pass over a bony prominence and make a snapping or clicking sound as the knee bends.
Changes in the cartilage surface. Slightly rougher cartilage can create a grating or crunching sensation, without necessarily causing symptoms.
Two other factors play a part. Joint hypermobility affects 10 to 20% of people and is hereditary, which may explain why clicking joints run in families. The same article notes that tendons snapping over bone become more frequent with age, as muscles lose elasticity and tendons stiffen.
Why does my knee click when I squat or stand up?
Squatting, stairs and standing up all load the knee while it bends, which is when the kneecap glides over the thigh bone and tendons shift across the joint. That makes these movements the usual moments for a click.
Harvard Health notes that joints are more likely to make noise after long periods of sitting or staying still. Its suggestion is simple: get up and move about more. If your knee clicks on the first few steps after a long meeting or car journey and then settles, that pattern fits an ordinary, harmless noise.
Does a clicking knee mean arthritis?
Not by itself. Joints can get noisier as we age, but according to Harvard Health, if they do not hurt when they pop, crack or creak, you need not be overly concerned.
The longer-term data are reassuring. The Conversation cites a study of 3,495 older adults, average age 61, in which two-thirds of those who said they always had knee crepitus did not develop symptomatic osteoarthritis over the next four years. RTE, reporting on the same research, adds that there is no strong evidence that cracking joints causes osteoarthritis. So clicking your knee will not wear it out.
Crepitus does matter as part of a wider picture. European guidance on diagnosing knee osteoarthritis lists crepitus, restricted movement and bony enlargement among the most useful clinical signs, alongside persistent knee pain, short-lived morning stiffness and reduced function, in adults aged 45 and over. The key word is alongside. A click with none of the other signs is not a diagnosis of anything.
If you are over 45 and are developing pain and stiffness as well as noise, our guide to physiotherapy for knee osteoarthritis explains what a typical course of treatment looks like.
When knee clicking needs checking
The line between harmless and worth checking is whether the click comes with something else. Painless, intermittent clicking is not an emergency. The signs below change that.
Book a physiotherapy or GP assessment if:
clicking is painful, or pain has started to accompany it
the knee catches or locks, or you cannot fully bend or straighten it
it gives way, or feels unstable when you pivot or go downstairs
swelling keeps coming back, or stiffness is affecting daily life
the clicking began after a twist, fall or sports injury
The Conversation advises consulting a health professional when noisy knees come with pain, swelling, instability or locking, or with other signs of arthritis such as stiffness, redness or reduced mobility. A clinician may recommend physiotherapy, advice on weight management or anti-inflammatory medication.
A click linked to one specific moment of a movement, particularly after an injury, deserves more attention than a general crunch. It can be a sign that a structure inside the knee, such as the meniscus, is involved. A hands-on assessment can tell the two apart.
Call NHS 111 or seek urgent help if:
The NHS advises calling 111 if the knee is very painful, cannot be moved or bear weight, is badly swollen or has changed shape, locks, gives way or painfully clicks. It gives the same advice if you have a very high temperature with redness or heat around the knee.
If you have had a significant injury, or the knee swells quickly, a hot, red, swollen knee with a fever should always be treated as urgent. For a fuller walk-through of knee pain warning signs and when to contact a clinician or NHS 111, this guide for recreational players is a good companion read.
What to do about a knee that clicks without pain
There is no effective treatment for crepitus on its own, and none is needed when it is painless. Couch and Culvenor’s advice is regular aerobic and resistance-based exercise and a healthy body weight. That is good news, because the same habits protect the joint in general.
Movement matters for a reason. RTE explains that cartilage has a very limited blood supply and depends on regular compression and release to receive nutrients. The article adds that exercise is the first treatment recommended in national and international guidelines for conditions such as osteoarthritis.
Practical steps:
Stay active. Walking, cycling and swimming keep the joint loaded in a comfortable way.
Strengthen the muscles around the knee. Strong thighs and hips share the load. Squats to a chair, step-ups and bridges are common starting points.
Break up long sitting. Stand and walk for a minute or two regularly if your knee clicks after being still.
Build up gradually. Increase running distance, hill work or gym load in small steps rather than sudden jumps.
Do not force the noise. There is no need to click or crack the knee on purpose, and no need to avoid movements that click without pain.
If you are active, our article on knee injury prevention for active adults goes into training load, footwear and warm-ups. For a controlled, low-impact way to build strength and movement control, see our guide to Pilates for knee pain.
Does worrying about the noise make it worse?
Possibly, in how it feels. RTE reports that people with knee osteoarthritis and noisy joints tend to report slightly more pain and reduced function than those without crepitus, yet there is no difference in walking speed or muscle strength between the groups. That points to a psychological effect of hearing the noise. Understanding that clicking is common can help you keep moving with confidence.
Our perspective on noisy knees
Most people who come to us worried about a clicking knee are relieved to hear the same thing: a click without pain, swelling or instability is very common, and it is not something to fix. What we do care about is the story around the noise. When did it start? Was there a twist or a fall? Does the knee catch, lock or feel unsure on stairs? Those answers, together with a hands-on examination of the knee, the way the kneecap moves, and how the hip and foot share the load, tell us far more than the sound itself. Our multidisciplinary team has treated musculoskeletal problems in Bedfordshire and Buckinghamshire since 1986. If your knee is simply noisy, we will say so and give you a strengthening and activity plan to keep it that way. If something more is going on, we can treat it early, and where imaging would help we can arrange a referral quickly. Strength, movement and graded exercise are the foundations of what we do. That is why we encourage people to keep moving rather than guard a knee that clicks. Ivan
What a knee assessment involves
A good assessment starts with your history: what happened, when the noise began, what makes it better or worse and what you want to be able to do. The knee is then examined for swelling, tenderness, alignment, range of movement and stability, and how the kneecap tracks. Hip movement, walking pattern and muscle strength are also checked, because they influence how the knee is loaded.
The outcome is usually a clear explanation and a plan. For a harmless click, that means reassurance and exercises. For pain, swelling or catching, it may mean a course of physiotherapy treatment or an image referral for a scan.
If you have had surgery and the knee clicks as you recover, our post-surgery knee strengthening guide sets out a step-by-step progression. Your surgeon’s or physiotherapist’s advice always comes first.
Book a knee assessment at Parks Therapy Centre
If your knee clicks and you would like it looked at, or if pain has begun to join the noise, our physiotherapists can assess it and set out a plan. We treat patients across our clinics in Bedfordshire and Buckinghamshire, and we accept private payment and health insurance.
Our published prices include a physiotherapy assessment at £76 and follow-up physiotherapy treatment at £67. If you need imaging, an image referral letter is £10 and an image results review is £67. Pilates group sessions are £9 per class, a useful option for building knee strength and control. You can see every price and book online on our prices page.
FAQ
Why can I feel my knee clicking?
You feel it because the kneecap, tendons and joint surfaces move against each other as the knee bends, and gas bubbles in the joint fluid can pop. This is common: a 2025 review found noisy knees in 36% of people without pain. If there is no pain, swelling or giving way, it is normally harmless.
Do knees get weaker with age?
Joints tend to get noisier with age, as cartilage changes and muscles and ligaments can lose some strength and elasticity. RTE notes this in its report on why joints crack and pop. Regular strengthening and aerobic exercise help you keep the muscles that support your knees working well.
Does painless knee clicking mean I will get arthritis?
No. Clicking without pain is common in healthy knees, and in one study of older adults two-thirds of people who always had crepitus did not develop symptomatic osteoarthritis within four years. See a clinician if pain, stiffness or swelling begin to appear alongside the noise.
Should I stop squatting if my knee clicks?
If the click is painless, there is no need to stop. Squatting and other loaded movements keep the muscles around the knee strong and the cartilage nourished. Stop and get the knee assessed if squatting becomes painful, the knee catches or locks, or it feels as though it might give way.
Is a clicking knee after an injury different?
Yes. A new click or pop that began with a twist, fall or sports injury, particularly with pain, swelling or instability, should be assessed promptly. The NHS advises calling 111 if the knee is very painful, badly swollen, cannot bear weight or locks.
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