What is Joint Cracking?

By Sydney CBD Osteopath Dr Abbey Davidson

What is joint cracking? , Is it bad for you? , Can it cause arthritis?

All your joint clicking, popping and cracking questions answered below!

Not up for a long read? Check out this joint cracking video by Dr Abbey Davidson (Osteopath) from our Sydney CBD location:

What is Joint cracking?

When a joint is bended or separated there can be an audible popping, clicking or cracking sound. This sound is created when pressure is released from within a synovial joint as carbon dioxide cavitation bubbles “pop”. This is often accompanied by the feeling of relaxation or satisfaction. Joint cracking is also referred to as joint manipulation, adjustments, mobilizations or HVLA.

The common misconception is that the clicking, popping or cracking sound comes from bones grinding against one another. This is not true!

The common misconception is that the clicking, popping or cracking sound comes from bones grinding or banging against one another. This is not true! Within a synovial or moving joint there is a thick egg-white like liquid called synovial fluid. This fluid lubricates joint surfaces and decreases friction. Within this fluid are various kinds of dissolved gas molecules such as carbon dioxide. By stretching the joint or separating the joint surfaces you create a decrease of pressure within the joint. This pressure change pulls what were dissolved gases out of the synovial fluid into bubbles which pops. The popping of the bubbles is the audible sound made when you crack joints such as your knuckles.

Because a “joint crack” is created by gases within the joints synovial fluid it takes roughly 20 minutes for replenishment. This means that you cannot repetitive crack a joint over and over. The sensations of multiple clicks, cracks or pops is generally due to a tendon flicking over a boney protuberance.

Can Joint cracking cause arthritis?

Because a “joint crack” is created by gases within the joints synovial fluid it takes roughly 20 minutes for replenishment

No long term medical research has been able to show a link between cracking your joints and arthritis.

There is a very famous slightly unorthodox study to disprove the wives’ tale about the relationship between joint cracking and arthritis. Dr. Donald Unger cracked joints on just one of his hands for 60 years. After this time imaging of his hands showed absolutely no difference between the cracked hand and the non-cracked hand.

Why do Chiropractors/Osteopaths/Physiotherapists crack joints?

A health professional will sometimes use “joint cracking” or joint manipulation as a therapeutic tool to help with various aches and pains. Popping a joint causes a temporary enlargement or separation of joint surfaces (increases size of joint cavity by 15%). This disengagement aims to decrease any restriction or poor positioning of the joint. This will also provide a sensation of relaxation which can be beneficial when a client is experiencing pain and tightness.

Benefits of Joint Manipulation:

Generally joint manipulation provides the following benefits:

  • Reduction in pain
  • Increased range of motion or flexibility
  • Return to physical activity
  • Decreased intake of pain medication
  • Decreased participation in surgical intervention

The benefits you receive from joint manipulation will vary between person to person. It will depend on the specific region, other medical conditions present, general health, age, re-aggravation, how long the symptoms have been present and your specific circumstances.

Is it bad to crack yourself?

Is Joint cracking safe? Can it cause arthritis

While it is tempting to crack yourself it is not recommended.

Osteopaths, Chiropractors and Physiotherapists spend many years at university learning the specific signs for when it is indicated or when not safe to manipulate someone. They are also well practiced and rehearsed at joint manipulation. When they perform a joint manipulation (or “crack”) they target the specific joint they want to manipulate and get moving. Often when you “crack” yourself you are moving a joint which is not restricted; leaving the restricted joint just above or below “un-cracked”. This is why the sensation of relief from getting the “crack” yourself doesn’t quite resolve feelings of discomfort.  See a health professional to have the area assessed and to have the underlying problem addressed.

What is HVLA?

When you come to see an osteopath or physiotherapists the specific “cracking” technique they use is called HVLA or High Velocity Low Amplitude. This means that techniques apply a low amount of force to the joint in a speedy way to achieve a “popping sound”.  HVLA is used on synovial joints all over the body most commonly to the spinal joints.

Is it having your joints cracked dangerous? Is spinal manipulation safe?

Current available evidence cannot agree on whether there is a direct relationship between neck adjustments and stroke.

Like with any treatment there are possible risks. 

Physiotherapists, Osteopaths and Chiropractors are highly trained health professional and spend a considerable amount of time at university learning to identify risk factors associated with joint manipulation. They continually to develop and practice their technique to be able to provide direct and specific manipulation.

If you have concerns about joint manipulation you are welcome to talk to your practitioner about the specific benefits and risks of the technique to you and your specific set of circumstances (region of the body, co-existing medical conditions, age, etc.). They should be able to answer all your questions/concerns, provide you with appropriate information/sources and discuss alternate therapies available. A manipulation technique will never be performed without your consent and a practitioner will always ask you prior to the technique be performed.

Nerissa D'Mello​​

Clinical Lead Physiotherapist
Nerissa’s interest in physiotherapy began after experiencing multiple injuries growing up. Being in and out of clinics sparked her curiosity about how the body heals and inspired her to help others return to what they love. Early hands-on experience with a Scottish rugby club during her masters strengthened her passion for musculoskeletal and orthopaedic rehabilitation.
 
Now the Clinical Lead Physiotherapist at Quay Health, she has a strong interest in helping patients recover without surgical intervention when possible. Her treatment style combines hands-on techniques with exercise prescription, grounded in the latest research to promote lasting recovery.
 
Some of the techniques Nerissa uses are dry needling, VALD ForceDecks and Dynamo for data-driven rehab, taping, and shockwave therapy for stubborn tendon injuries.
 
She enjoys treating a broad range of patients, regardless of age, fitness, or background, and is currently expanding her expertise in women’s health.
 
Patients can expect a thorough, personalised approach focused on understanding their goals, hands-on treatment, and education in a supportive environment.
 
Outside work, you can find Nerissa training for her first full marathon, playing tennis, smiling at your dog, and trying to keep up with all her downloaded podcasts.
 
Clinical interests include:
 
  • Shoulder injuries, including rotator cuff and instability
  • Ankle sprains
  • Tennis and racquet sports injuries
  • Neck and upper back pain
  • Rehab from postoperative hip and knee replacements
  • Women’s health 
 
Languages spoken other than English: Conversational Hindi
 
Nerissa is available at Quay Health. Call 1300 782 943 to make an appointment or book online.

Riccardo Erba​

Senior Physiotherapist

Riccardo’s passion for physiotherapy started while working with patients recovering from strokes, multiple sclerosis, and brain injuries. Seeing how vital movement is inspired him to explore the connection between the brain and body. Over seven years, he developed a holistic approach combining manual therapy, education, and sport-focused rehab.

His treatment style is evidence-based and tailored, blending hands-on therapy with corrective exercises and advanced technologies. Riccardo believes every patient deserves a personalised plan that balances pain relief and long-term improvement.

He uses techniques including spinal manipulation, mobilization with movement, dry needling, Class IV lasers, shockwave therapy, and VALD ForceDecks.

Riccardo enjoys helping clients who want to understand their bodies, relieve pain, prevent injury, and improve performance.

Outside work, he loves hiking, climbing, and following ball sports of all kinds.

Clinical interests include:

  • Headaches and neck pain
  • Shoulder and elbow conditions
  • Hip and knee rehab
  • Shockwave and laser therapy

Languages spoken other than English: Italian

Riccardo is available at Quay Health. Call 1300 782 943 to make an appointment or book online.