Have you ever noticed your knee making a clicking, cracking or popping sound when you walk, squat or climb stairs? These noises can be surprising and sometimes worrying, especially if they’re new or accompanied by pain.
The good news is that knee noises are common and, in many cases, are not a cause for concern. However, if the sounds are associated with pain, swelling or instability, they may indicate an underlying knee condition that should be assessed.
At PJS Orthopaedics, we evaluate a wide range of knee conditions and provide personalized treatment recommendations based on each patient’s symptoms, lifestyle and goals.
Why Does My Knee Make Clicking or Cracking Sounds?
The medical term for joint noises is crepitus.
Crepitus refers to sounds or sensations such as clicking, cracking, popping or grinding that occur during joint movement. These noises may originate from several structures within the knee, including cartilage, ligaments, tendons or the movement of gas bubbles within the joint fluid.
Not all knee noises indicate damage, and many people experience occasional clicking without any underlying problem.
Common Causes of Knee Clicking, Cracking or Popping
Gas Bubbles in the Joint
Your joints contain synovial fluid, which helps lubricate movement. Tiny gas bubbles can form within this fluid and may collapse during movement, creating a popping or cracking sound.
This is generally harmless and similar to cracking your knuckles.
Tendons or Ligaments Moving Over Bone
As your knee bends and straightens, tendons and ligaments can move slightly over nearby bony structures before returning to their normal position.
This movement may produce an occasional clicking sensation without causing pain.
Cartilage Wear (Osteoarthritis)
As cartilage gradually wears down, the joint surfaces become less smooth.
People with knee osteoarthritis may experience:
- Grinding sensations
- Clicking or cracking
- Stiffness
- Swelling
- Pain during activity
These symptoms often develop gradually over time.
Meniscus Tears
The meniscus is a piece of cartilage that cushions the knee joint.
A torn meniscus may cause:
- Clicking
- Catching
- Locking
- Pain
- Swelling
- Difficulty twisting or squatting
If clicking is accompanied by pain or your knee feels as though it catches during movement, further assessment may be recommended.
Patellofemoral Pain Syndrome
The kneecap (patella) moves within a groove at the front of the knee.
Changes in the way the kneecap tracks during movement may lead to clicking or grinding sensations, particularly when:
- Climbing stairs
- Squatting
- Standing after prolonged sitting
- Running
Previous Knee Injury
A previous ligament injury or fracture may alter the mechanics of the knee joint, increasing the likelihood of clicking or popping during movement.
When Is Knee Clicking Normal?
Occasional painless clicking is often considered normal.
You generally do not need to worry if:
- The clicking is painless
- There is no swelling
- Your knee feels stable
- You have full movement
- Daily activities are unaffected
Many healthy knees make noise without indicating a serious problem.
When Should You See an Orthopaedic Specialist?
Arrange an assessment if knee clicking is accompanied by:
- Persistent pain
- Swelling
- Locking
- Catching
- A feeling that the knee gives way
- Reduced range of motion
- Difficulty walking or exercising
- Symptoms following an injury
These symptoms may suggest an underlying condition that requires further evaluation.
How Are Knee Problems Diagnosed?
Your orthopaedic specialist will begin with a detailed medical history and physical examination.
Depending on your symptoms, further investigations may include:
- X-rays to assess the bones and signs of arthritis
- MRI to evaluate cartilage, ligaments and the meniscus
- Additional imaging when clinically appropriate
A thorough assessment helps identify the underlying cause and guide appropriate management.
Treatment Options
Treatment depends on the diagnosis and severity of symptoms.
Options may include:
- Physiotherapy
- Strengthening and flexibility exercises
- Activity modification
- Weight management where appropriate
- Pain management strategies
- Bracing in selected cases
- Surgical assessment if conservative treatments are unsuccessful or if significant structural damage is present
Your treatment plan should always be tailored to your individual needs and diagnosis.
Can Knee Clicking Be Prevented?
While not all knee noises can be prevented, maintaining healthy joints may reduce your risk of developing painful knee conditions.
Helpful strategies include:
- Staying physically active
- Strengthening the muscles around the knee
- Maintaining a healthy weight
- Wearing supportive footwear
- Warming up before exercise
- Avoiding sudden increases in activity
Frequently Asked Questions
Is it normal for my knees to crack every time I squat?
If there is no pain, swelling or instability, occasional cracking during squats is often considered normal. Persistent or painful symptoms should be assessed by a healthcare professional.
Does knee clicking always mean arthritis?
No. Knee clicking has many possible causes, and many people without arthritis experience occasional joint noises.
Can exercise make knee clicking worse?
Not necessarily. Appropriate exercise is important for maintaining joint health. However, if exercise consistently causes pain or swelling, medical assessment is recommended.
Should I stop exercising if my knee clicks?
If the clicking is painless, it is often safe to continue exercising. If the clicking is associated with pain, instability or locking, seek advice from your healthcare provider before continuing high-impact activities.
Book an Orthopaedic Consultation
If your knee clicking or popping is accompanied by pain, swelling or instability, a comprehensive assessment can help determine the underlying cause.
Dr Parminder J. Singh provides assessment and management of a wide range of hip and knee conditions, offering personalised treatment plans based on each patient’s individual needs.
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