What Is Osteoarthritis?
Osteoarthritis is the most common form of arthritis in the world, affecting an estimated 528 million people globally as of 2019 growing more than double the number recorded in 1990. You may hear doctors call it "degenerative joint disease," but in plain terms, it is a condition where the protective cushioning inside your joints gradually wears away, causing your bones to rub against each other.
To understand it better, think of your joints. Where two bones meet, each bone end is coated in a layer of tough, slippery tissue called cartilage. Cartilage acts like a two-in-one shock absorber and lubricant, it allows your bones to glide smoothly and painlessly past each other every time you move. In osteoarthritis, this cartilage slowly breaks down. Over time, without that protective cushion, movement becomes painful, stiff, and difficult.
Importantly, osteoarthritis does not only affect the cartilage. It also damages the bone, the tendons, the ligaments, and the lining of the joint itself. In advanced stages, small bony growths called bone spurs (or osteophytes) can form around the edges of affected joints, and tiny bits of bone or cartilage can even break off and float inside the joint space, causing further damage.
Types of Osteoarthritis
Doctors generally recognise 2 forms of the disease:
Primary osteoarthritis — This is the most common type. It develops gradually over time due to normal wear and tear on the joints throughout your life. There is no single injury or event that triggers it, it simply accumulates.
Secondary osteoarthritis — This has a more direct cause. It occurs when something specifically damages a joint such as a sports injury, a fall, a car accident, or another form of arthritis like rheumatoid arthritis or gout, and that damage eventually leads to osteoarthritis in that joint.
Who Gets Osteoarthritis?
Anyone can develop osteoarthritis, but it is far more common in older adults. Studies show that more than 80% of adults over the age of 55 have some degree of osteoarthritis, even if many of them never notice symptoms. About 60% of those living with osteoarthritis experience symptoms they can feel.
Around 73% of people with osteoarthritis are over 55 years old, and approximately 60% are women. Women are more likely to develop osteoarthritis particularly after menopause though the exact reason is not fully understood.
Younger people can also develop the condition, usually as a result of a joint injury, an abnormal joint structure, or a genetic predisposition.
Which Joints Are Most Commonly Affected?
Osteoarthritis can affect any joint in the body, but it most frequently develops in:
● Knees — the most commonly affected joint worldwide, with an estimated 365 million people affected.
● Hips
● Hands — particularly the ends of the fingers and the base of the thumbs
● Neck (cervical spine)
● Lower back (lumbar spine)
Each of these joints can present slightly differently. In the knees, you may hear a grinding or scraping noise when you walk, and over time the knee may feel unstable. In the hips, pain often radiates to the groin, inner thigh, or buttocks. In the hands, the finger joints may develop visible bony enlargements and change shape over time. In the spine, narrowing discs and bone spurs can lead to spinal stenosis, which causes its own set of complications.
What Are the Symptoms?
Osteoarthritis symptoms typically develop slowly and worsen gradually over time. The most common ones include:
Pain — usually felt during or after using the affected joint. In the earlier stages, rest relieves the pain, but in later stages, some people feel pain even when resting or at night.
Stiffness — most noticeable in the morning or after a period of inactivity. Importantly, osteoarthritis related stiffness usually lasts less than 30 minutes, which helps distinguish it from other forms of arthritis.
Swelling — caused by inflammation in the soft tissues around the joint, especially after prolonged activity.
Reduced range of motion — the joint may not move as far as it used to, making everyday tasks like stepping up stairs, rising from a chair, or gripping objects more difficult.
A grating or grinding sensation — you may feel or hear popping, cracking, or scraping when using the joint.
Joint instability — the joint may feel loose or unreliable underfoot.
Joint deformity — over time, the joint may look visibly different from how it once did.
Beyond the physical symptoms, the chronic pain and reduced mobility of osteoarthritis can lead to fatigue, disturbed sleep, depression, and anxiety.
People often become less physically active to avoid pain, which in turn weakens the muscles around the joint creating a cycle that places even more stress on the joint over time. Reduced activity also increases the risk of other serious conditions such as heart disease, diabetes, and obesity.
What Causes Osteoarthritis?
The exact trigger that starts cartilage breakdown is not fully understood. What researchers do know is that it is not simply a matter of "using your joints too much." Rather, changes in the tissues of the joint influenced by a combination of factors set off a slow, progressive breakdown process.
As the damage develops, it affects all parts of the joint: the cartilage, tendons, ligaments, the synovial lining (the membrane that lubricates the joint), and the bone itself. The joint gradually loses its normal shape, and eventually bone spurs may form. In some cases, the joint can become barely functional.
What Are the Risk Factors?
Several factors are known to increase your likelihood of developing osteoarthritis:
Age — the older you are, the higher the risk. Most cases occur in people over 55.
Being female — women are more likely than men to develop osteoarthritis, especially after the age of 50 or following menopause.
Obesity — excess body weight puts extra mechanical stress on weight-bearing joints like the hips and knees. Fat tissue also produces proteins that promote inflammation in and around the joints, making obesity a double risk factor.
Previous joint injuries — fractures, sprains, or surgical procedures on a joint increase the risk of osteoarthritis developing in that joint later in life, even decades afterward.
Repetitive joint stress — jobs or sports that involve repeated movements of the same joint over many years can accelerate wear on that joint.
Genetics — a family history of osteoarthritis increases your risk of developing it yourself, suggesting an inherited susceptibility.
Abnormal joint structure — being born with malformed joints or defective cartilage increases susceptibility.
Metabolic conditions — diseases such as diabetes, high cholesterol (hyperlipidemia), and hemochromatosis (too much iron in the body) are associated with a higher risk of OA.
Other types of arthritis — inflammatory forms of arthritis, including rheumatoid arthritis, gout, and psoriatic arthritis, can damage cartilage enough to cause secondary osteoarthritis.
How Is Osteoarthritis Diagnosed?
If you are experiencing persistent joint pain or stiffness especially if it does not improve within a few days, you should see a healthcare provider. The earlier osteoarthritis is identified, the better the chances of slowing its progression and preserving joint function.
Diagnosis typically involves:
● A physical examination of the affected joints, along with a discussion of your symptoms and when they began.
● X-rays, which can reveal cartilage loss, bone spurs, and joint space narrowing.
● MRI or CT scans for a more detailed look at the joint tissues.
● Blood tests to rule out other conditions that cause similar symptoms (such as rheumatoid arthritis).
Can Osteoarthritis Be Treated?
There is currently no cure for osteoarthritis, and once cartilage has been lost, it cannot be regrown. However, the good news is that symptoms can be managed effectively, and the right combination of treatments can significantly improve quality of life. The goal of treatment is to reduce pain, maintain joint function, and slow down further damage.
Exercise and physical therapy — regular movement is one of the most important tools. Low-impact activities like swimming, water aerobics, walking, and weight training help strengthen the muscles around affected joints, reduce stiffness, and support mobility. A physiotherapist can design a safe and effective programme for your needs.
Medications — over-the-counter pain relievers and anti-inflammatory drugs (NSAIDs) can help manage pain and inflammation. These may be taken by mouth or applied directly to the skin as creams or patches. Note that most guidelines do not recommend opioid analgesics, glucosamine supplements, or visco-supplementation therapies for osteoarthritis, as evidence for their effectiveness is insufficient.
Heat and cold therapy — applying a warm pad or cold compress to an affected joint can ease pain and stiffness.
Supportive devices — shoe inserts, joint braces, walking aids, or adaptive tools (such as jar-opening grips) can take pressure off painful joints and help you carry out daily activities more safely and comfortably.
Weight management — maintaining a healthy body weight reduces mechanical stress on weight-bearing joints and lowers systemic inflammation, slowing the progression of osteoarthritis.
Complementary therapies — some people find relief through acupuncture, massage, tai chi, or meditation. Always discuss these with your doctor before starting.
Low-dose radiation therapy (LDRT) — an emerging option for people with early-stage osteoarthritis who wish to avoid surgery or medication, using small amounts of radiation to reduce joint inflammation.
Surgery — most people do not require surgery. However, for those with severe symptoms that have not responded to other treatments, joint replacement surgery (arthroplasty) most commonly performed on the hip and knee can effectively relieve pain, restore movement, and dramatically improve quality of life.
Working with an occupational therapist can also be valuable, helping you adapt your home and work environment, learn safe techniques for daily tasks, and manage flare-ups.
Can Osteoarthritis Be Prevented?
While osteoarthritis is not an inevitable part of aging, certain lifestyle choices can significantly reduce your risk or slow the condition's progression if you already have it.
● Stay physically active with regular low-impact exercise
● Maintain a healthy weight to reduce stress on your joints
● Protect your joints by wearing proper safety equipment during sports and physical work
● Avoid repetitive overuse of any single joint where possible
● Eat a nutritious diet that supports a healthy weight and reduces inflammation
● Don't smoke — tobacco use is harmful to overall health and can worsen inflammatory conditions
● Always wear your seatbelt to reduce the risk of joint injuries in accidents
● See your doctor regularly, especially if you notice any changes in your joints.
Living with Osteoarthritis
Most people with osteoarthritis will need to manage their symptoms over the long term. This does not mean a lesser quality of life, it means building a lifestyle that works alongside the condition.
Staying as active as possible is crucial. When joint pain makes this difficult, speak to your healthcare provider promptly rather than waiting. New treatments or adjustments to your existing plan can often help.
Of the 344 million people worldwide whose osteoarthritis is moderate to severe, most could benefit significantly from a personalised rehabilitation strategy. Early diagnosis and a tailored care plan involving doctors, physiotherapists, occupational therapists, and the patient themselves remain the best approach.
The condition can affect not just your body but your mood, your sleep, your relationships, and your ability to work and socialise. It is important to address these impacts openly with your healthcare team, and to know that psychological support is a valid and important part of managing osteoarthritis.
When Should You See a Doctor?
As soon as you notice symptoms. Even mild, persistent joint pain can be a sign that osteoarthritis is beginning to develop. Every day of untreated progression is cartilage that cannot be recovered. Early treatment can slow the disease and protect your joints for longer.
Also return to your doctor if:
● Your symptoms are becoming more frequent or more severe
● Your current treatments no longer seem to be working
● The pain or stiffness is significantly interfering with your daily life or sleep
The Bottom Line
Osteoarthritis is a very common, progressive joint condition that affects hundreds of millions of people around the world. It cannot be cured or fully reversed, but it can absolutely be managed. With the right combination of exercise, weight control, medication, supportive tools, and professional care, most people with osteoarthritis can live active, fulfilling lives.
The most important step you can take is to seek help early, stay informed, and stay moving.
