How movement affects joint and cartilage health

Regular movement is generally beneficial for joints: it maintains muscle strength, mobility, coordination, and the joint's ability to withstand everyday stress. The idea that every step, squat, or run gradually wears down articular cartilage is overly simplistic. With normal physical activity, a healthy joint adapts to mechanical stress, and in osteoarthritis, properly selected exercises are a key treatment method, not a cause of further joint destruction. [1]

However, not every load, no matter the volume, is beneficial. Heavy, repetitive professional workloads, long-term high-level sports, training with a poorly recovered injury, or a sudden increase in exercise volume create a completely different mechanical context. Injuries to ligaments, menisci, and cartilage are particularly important: previous joint trauma is a well-established factor in subsequent osteoarthritis. [2]

If a joint already hurts due to osteoarthritis, completely avoiding movement is usually not the right strategy. NICE recommends individually tailored therapeutic exercises for all people with osteoarthritis and specifically warns that pain or discomfort may temporarily increase at the beginning of exercise. Regular exercise improves function and reduces symptoms over the long term. [3]

However, a sudden hot and severely swollen joint, a high fever, a severe injury, a joint deformity, or the inability to bear weight on it are no longer a situation for independent training. In such cases, a medical assessment is required first. [4]

Why does a joint need mechanical load at all?

A joint is more than just two bones separated by a layer of cartilage. Its function involves articular cartilage, subchondral bone, synovial membrane, ligaments, tendons, muscles, and the nervous system. Therefore, joint health is determined by more than just the thickness of the cartilage. Osteoarthritis, for example, is now considered a disease of the entire joint, in which changes can affect multiple tissues simultaneously. [5]

Movement creates mechanical signals for these tissues. During walking, the joint is periodically loaded and unloaded; during strength training, muscle force and pressure in the joint change; during balance exercises, the nervous system learns to more precisely control the position of the limb. This variable mechanical stimulus is part of the normal physiology of the musculoskeletal system. [6]

Therefore, the usefulness of a load doesn't mean that "the more pressure you put on a joint, the healthier it will become." Biological tissues adapt within a certain range of loads. If the mechanical stress significantly exceeds the tissue's ability to recover—for example, after an injury or with a sharp increase in training volume—the risk of injury increases.

On the other hand, chronic avoidance of movement leads to other problems: decreased muscle strength, impaired physical performance, and a person's ability to use the full range of motion less and less. In osteoarthritis, this strategy can create a cycle of "pain → less movement → weaker muscles and worse function → normal activity becomes more difficult." This is why modern recommendations make exercise a central part of treatment. [7]

What happens to articular cartilage during movement?

Cartilage is designed to withstand mechanical stress. It temporarily deforms under pressure, and after unloading, its shape returns to normal; such short-term changes are not the same as damage or "wearing out."

Articular cartilage contains virtually no blood vessels. The exchange of small molecules between the cartilage and the surrounding environment occurs primarily by diffusion, primarily through the synovial fluid; the transport of substances is also influenced by the structure of the cartilage itself and the mechanical state of the tissue. [8]

Modern magnetic resonance imaging reveals that immediately after running, the thickness and volume of some areas of knee cartilage decrease slightly. A systematic review of 24 studies found that these changes were small and mostly short-lived; cartilage composition indicators returned to baseline levels after rest, and existing defects did not increase after a single run. The authors interpreted the result as a natural tissue response to stress, rather than evidence of tissue destruction. Confidence in some of this data remains low due to the small and heterogeneous nature of the studies. [9]

A larger systematic review of 43 studies came to a similar conclusion: there are temporary changes in cartilage volume, thickness, and some magnetic resonance properties after running, but these are not maintained; moderate data also showed no formation of new cartilage defects following repeated running.[10]

Therefore, the loss of cartilage thickness immediately after exercise cannot be compared to the wear of a shoe sole. A significant portion of the immediate change is due to fluid movement within the tissue.

"Movement nourishes cartilage" is true, but not quite as it is often explained.

A popular formula goes something like this:

With each step, the cartilage contracts like a sponge, old fluid comes out, new fluid comes in and brings nutrients.

It's convenient, but too mechanical.

Cartilage does not have its own proper vascular network, and its cells rely on the transport of substances from the environment. Mechanical loading alters the fluid content and movement in the matrix and affects cartilage cells through mechanical signals. [11]

But even in an experiment on human articular cartilage, researchers directly tested the "pump" hypothesis: the tissue was subjected to cyclic loading, simulating walking. For small molecules, including compounds comparable in size to essential nutrients, cyclic loading did not significantly accelerate transport. For larger molecules, the effect was more pronounced. [12]

Therefore, a more precise formulation is this: movement creates a natural mechanical environment for cartilage, changes fluid exchange and cellular signals, but cartilage nutrition cannot be reduced to a simple “squeezing and sucking out synovial fluid.”

This is one of those cases where a simplified metaphor is useful for understanding, but should not be converted into a literal physiological explanation.

What does synovial fluid do?

Synovial fluid is found within most moving joints and helps lubricate the contacting surfaces. In a normal joint, very low friction is ensured by a complex system that includes the cartilage itself, synovial fluid, hyaluronic acid, lubricin, and other components of the articular surface. [13]

During movement, the pressure distribution and contact between the articular surfaces change. Therefore, the colloquial expression "to work out the joint" has a physiological meaning in relation to motor skills and the sensation of stiffness, but the assertion that a few knee rotations literally "pump lubrication into the joint" would also be an oversimplification.

This effect is particularly noticeable subjectively in people with osteoarthritis: after prolonged sitting or morning rest, the joint may feel stiff, but after a few minutes of movement, the stiffness improves. NIAMS indeed describes brief stiffness after a period of immobility as a typical feature of osteoarthritis and recommends physical activity to improve function and mobility. [14]

Muscles are one of the main reasons why movement is good for your joints.

Strong muscles help the joint do its job better.

The knee joint depends not only on the condition of the cartilage but also on the strength of the quadriceps, gluteal muscles, hamstrings, and other lower limb muscles. They create and control movement, contribute to limb stabilization, and allow a person to more easily stand, walk, climb stairs, and maintain balance.

NIAMS therefore includes strength training exercises with weights or elastic bands in the standard recommendations for people with osteoarthritis: their goal is to strengthen the muscles that support the affected joints. [15]

An updated systematic review of 27 studies with 1,712 participants found that strength training for knee or hip osteoarthritis improved muscle strength, physical function, and reduced pain on average.[16]

This doesn't mean the muscle becomes a "shock absorber" that completely relieves the cartilage of stress. During a vigorous movement, joint forces can, on the contrary, sometimes be significant. The main benefit lies in the increased functional capacity of the entire system: the person becomes stronger, has better control over movement, and can more easily handle the necessary daily activities.

The movement maintains range of motion

When a joint is used regularly within a comfortable range, a person is better able to perform flexion, extension, and other necessary movements.

NIAMS specifically highlights range of motion exercises and stretching as a way to maintain joint mobility in osteoarthritis.[17]

This is especially important for someone who, due to pain, begins to bend their knee less, extend their hip less, or avoid shoulder movement. Gradually, the limitation may become permanent not only due to the initial pain, but also due to weakness, fear of movement, and decreased functional range.

However, stretching cannot mechanically "restore worn cartilage." Its purpose is to maintain muscle and joint mobility and facilitate movement.

Movement improves control and balance

Joint health depends not only on strength, but also on how accurately the nervous system controls movement.

So-called neuromuscular exercises train coordination, balance, knee or hip control, and movement quality. This principle is used, for example, in the GLA:D program for people with knee and hip osteoarthritis: the program combines patient education and controlled neuromuscular exercises. [18]

The American College of Rheumatology also includes walking, muscle strengthening, neuromuscular training, and aquatic exercise as possible exercise options for osteoarthritis, without establishing a universal hierarchy in which one method is considered best for everyone.[19]

For older adults, this part is especially important because balance exercises help reduce the risk of falls. The World Health Organization recommends that older adults combine aerobic exercise, muscle strengthening, and exercises aimed at functional balance. [20]

What happens if you move too little?

Complete rest is rarely a good long-term strategy for common chronic joint disease.

Lack of movement doesn't necessarily directly "destroy cartilage," but rather refers to a deterioration in the functional state of the entire musculoskeletal system. A person loses muscle strength and endurance, everyday activities require increasing effort, and the fear of pain further limits activity.

This is especially noticeable in osteoarthritis. Pain causes a person to walk less; muscles become weaker; then getting up from a chair or climbing stairs becomes more difficult, and the person further reduces their activity. Therefore, therapeutic exercise should break this cycle gradually, rather than requiring the patient to ignore severe pain.

NICE specifically recommends that patients be advised that regular physical activity is beneficial for their joints, even if some discomfort occurs in the first weeks of exercise therapy.[21]

This is why modern advice for chronic joint pain usually sounds not like "save the joint and use it less," but rather like "select a tolerable load and gradually increase the ability of the joint and muscles to handle it."

Does movement really wear out joints?

Normal physical activity and mechanical destruction of the joint are not the same thing.

NIAMS specifically notes that the development of osteoarthritis cannot be explained simply by "wear and tear." Age, body weight, previous injuries, joint structure, heredity, and certain repetitive stress factors influence the disease. [22]

If routine mechanical work automatically destroyed articular cartilage, osteoarthritis would inevitably be more common in people who walk or jog regularly. The data don't show this.

A 2023 meta-analysis included 12,273 people and found no higher prevalence of knee osteoarthritis in runners compared to controls. Even when dividing running volume to more than 48 km per week, no statistically significant increase in prevalence was found. However, most of the included studies were observational and had a significant risk of bias, so this result demonstrates the absence of a convincing signal of harm rather than the absolute safety of any running regimen. [23]

In a study of people over 50 years of age with pre-existing knee osteoarthritis, self-selected running was not associated with faster radiographic disease progression or the development of new, frequent pain during the follow-up period. This finding is also observational and does not mean that running is appropriate for everyone with osteoarthritis. [24]

Therefore, the correct formula is much more accurate:

Joints need load, but the load must correspond to the ability of the tissues to bear it.

Where does payload end and overload begin?

The problem is usually determined not by the name of the exercise, but by a combination of intensity, volume, frequency, recovery, and the condition of the joint itself.

A 5km run by someone who is used to running and the same distance by someone who has been practically inactive for several years have completely different effects.

Likewise, squatting with weights alone can't be called either "good" or "bad for the knees." One person can perform squats with appropriate loads after several months of training, while another starts with a weight significantly beyond their current fitness level.

Osteoarthritis data clearly illustrate this difference. Moderate recreational physical activity in most studies does not demonstrate a simple "more movement = more osteoarthritis" relationship, but very high cumulative physical activity has been associated with a higher risk in some observational analyses compared with moderate activity. A causal role is difficult to establish because high activity is often associated with injuries, occupational factors, and other factors. [25]

This is especially evident in professional workloads. Long-term work involving frequent deep squats or kneeling is associated with an increased risk of knee osteoarthritis. This is a completely different type of impact than a few sets of squats in a gradually progressing workout. [26]

Why is injury more dangerous for a joint than regular exercise?

One of the most serious long-term threats to a joint is not the physical activity itself, but injury.

Injuries to the anterior cruciate ligament, meniscus, articular cartilage, dislocations, and some fractures significantly increase the likelihood of subsequent post-traumatic osteoarthritis. The OPTIKNEE consensus systematic review found moderate certainty that various serious knee injuries are associated with increased odds of symptomatic osteoarthritis later in life. [27]

In an earlier, large meta-analysis, a history of anterior cruciate ligament injury was associated with an approximately fourfold increased odds of knee osteoarthritis, and a meniscus injury or associated injury was associated with an even higher association. These figures reflect relative odds from observational data and do not mean that every patient will develop osteoarthritis.[28]

The practical implication here is different from the call to avoid sports. It's to reduce the risk of injury and recover properly: gradually increase the load, practice technique, use appropriate equipment, take fatigue into account, and avoid returning to high-intensity sports until function has recovered.

NIAMS also includes injury prevention—warm-up, proper footwear and protective equipment, and recovery from intense activity—in its recommendations for maintaining joint health.[29]

Is walking good for your joints?

For most people, yes. Walking is an affordable way to regularly exercise muscles and joints without requiring advanced fitness.

It is included in the NIAMS list of appropriate low-impact activities for people with osteoarthritis and is used as an exercise option in the American College of Rheumatology guidelines.[30]

If a person has been sedentary for a while, there's no need to rush into long walks. Several shorter walks may be more beneficial than one long one, especially if you're in pain or have low fitness levels.

With severe knee osteoarthritis, distance and speed must be adjusted individually. Sometimes it's more convenient to alternate walking with cycling or water exercise to increase overall activity without placing excessive strain on one painful joint.

If a specific distance regularly causes prolonged increases in pain and swelling, a helpful solution would be not to completely stop walking, but to reduce the load and, if necessary, consult a physiotherapist.

Is running good for your joints?

Recreational running itself is not considered a proven cause of knee osteoarthritis.

Systematic reviews show that short-term changes in cartilage magnetic resonance characteristics are restored after running, and available observational data do not demonstrate a higher prevalence of osteoarthritis in casual runners.[31]

But this does not mean that:

• running is suitable for any joint pathology;
• any amount of running is safe;
• you can ignore the injury;
• Professional high-volume sport is equivalent to recreational running.

The last caveat is particularly significant. In an older but large meta-analysis, recreational runners had a different risk profile than competitive athletes; the authors specifically noted the possible role of high loads and sports injuries. [32]

If you've never run before, your joints, tendons, muscles, and bones need time to adapt. A sudden transition from several thousand steps a day to intense daily jogging creates a completely different strain than a gradual increase in volume.

Bicycles and joints

Cycling allows you to repeatedly bend and extend your knees and hips with relatively little impact.

NIAMS includes cycling among the low-impact aerobic exercises that can be used by people with osteoarthritis.[33]

This makes an exercise bike or a regular bicycle a convenient option for people who still find long distance walking too painful.

However, low impact doesn't mean no impact at all. Gearing that's too heavy, an incorrect saddle height, or excessive training volume can all cause knee pain. Therefore, technical adjustments and gradual increases in duration remain important.

Swimming and water exercises

Water allows for joint movement while reducing the impact of body weight on the lower limbs.

This is why NIAMS recommends aquatic exercise as an option for osteoarthritis, especially if regular land-based exercise is still painful. [34]

Water makes it easier to train endurance and range of motion without putting the same stress on the hips and knees as walking or running.

But swimming shouldn't necessarily replace other activities entirely. Muscle strength may still require additional resistance training, and activities that involve working against gravity are beneficial for bone health.

Strength training - harm or protection

Properly selected strength training is part of a modern strategy for joint health and osteoarthritis treatment.

NICE recommends individual exercise for osteoarthritis, including local muscle strengthening and general aerobic fitness.[35]

The American College of Rheumatology also strongly recommends exercise for osteoarthritis of the knee, hip, and hand. For the lower extremities, strength, aerobic, neuromuscular, and aquatic options are possible, with insufficient evidence to declare one type universally superior. [36]

An updated 2024 Cochrane review included 139 randomized trials and 12,468 participants with knee osteoarthritis. On average, exercise improved pain and physical function compared with no exercise or usual care, although the magnitude of benefit varied between studies, and for some results, the clinical significance remained uncertain. [37]

This is a more accurate description of the evidence than the categorical "exercise always relieves pain." Exercise is a basic treatment, but individual effectiveness varies.

What types of movement do joints need?

There's no universal "best exercise for joints." A comprehensive program typically combines several functions.

Type of activity	What does it give?	When is it especially useful?	What to consider
Walking	aerobic exercise, regular movement of the lower limbs	for everyday activity and endurance	increase the distance gradually
Bike	low-impact knee and hip movements	when long walks are painful	adjust the fit and resistance correctly
Swimming and water activities	movement with reduced body weight load	with painful osteoarthritis or low physical fitness	do not completely replace strength training
Strength exercises	increase muscle strength and functionality	at almost any age	gradual progression is needed
Mobility exercises	help maintain available range of motion	with stiffness and limited movement	the stretch should not cause sharp pain
Balance and neuromuscular exercises	improve motion control and stability	especially in the elderly and after certain injuries	Sometimes specialist supervision is useful
Running	aerobic exercise and adaptation to higher mechanical stress	for trained people, if well tolerated	increase volume gradually, taking into account injuries

The main distinction is not between “good” and “bad” sports, but between the load to which a person is adapted and the load that significantly exceeds his current ability to recover.

How much movement is needed?

For general health, the World Health Organization recommends adults 150-300 minutes of moderate-intensity aerobic activity per week, or 75-150 minutes of vigorous-intensity aerobic activity, or a combination of both. It is also recommended to train major muscle groups at least two days per week. [38]

These are general health guidelines, not mandatory "joint norms." Someone with severe osteoarthritis, a recent injury, or very little initial fitness may start significantly below these values.

WHO specifically emphasizes the important principle: any physical activity is better than no activity at all, and the entire recommended load should not be completed in one long session. [39]

Therefore, for someone who can only comfortably walk for ten minutes at a time, three short walks may be a more reasonable start than trying to meet the one-hour standard straight away.

From a joint perspective, regularity and gradual adaptation are usually more important than trying to quickly “meet the norm.”

Is it necessary to do joint exercises daily?

Specialized short exercises can be a convenient way to stay mobile, especially for people who sit a lot or have stiffness.

But a healthy person doesn't need to perform a complex set of rotations at each joint to prevent the synovial fluid from drying out. Everyday life already involves a variety of joint movements: walking, standing, climbing stairs, carrying objects, and working with the hands.

If a person regularly engages in walking, strength training, and other physical activity, separate "joint lubrication exercises" are not a mandatory biological ritual.

It becomes especially useful when you need to restore a specific range of motion after a period of inactivity or due to illness. In such cases, it's better to tailor exercises to the specific limitation rather than using a single, universal set of exercises for all joints.

Is it possible to exercise if the joint hurts a little?

Minor discomfort doesn't always mean an exercise is causing harm. Severe, sharp, or persistent joint pain is a signal to reduce the load and investigate the cause.

NICE specifically warns people with osteoarthritis that pain may temporarily increase when starting exercise therapy, but regular exercise usually brings long-term benefits.[40]

It's important to distinguish between normal muscle soreness after an unusual workout and worsening joint condition. Mild muscle soreness the day after a strength workout is common; sharp joint pain immediately during movement, noticeable new swelling, or severe soreness that persists the next day often means the volume or intensity should be reduced. [41]

It is practically useful to observe not only the pain during training, but also how the joint behaves after it and the next day.

If mild discomfort quickly returns to normal levels, the load is probably tolerable.

If after each workout the joint swells, the pain is significantly stronger and normal walking becomes difficult for a day or more, the workout requires adjustment.

This is not a universal diagnostic test, but it is a good way to dose the load between visits to a specialist.

What is "sufficient load" for a sore joint?

There is no single, universal exercise dose for osteoarthritis.

Even the American College of Rheumatology, while making a strong recommendation for exercise, explicitly states that there is insufficient evidence to establish one best type, intensity, frequency, and duration of exercise for all patients. [42]

New systematic analyses confirm this uncertainty. For example, a 2025 review found no simple linear relationship between the total prescribed dose of strength training and the magnitude of improvement in pain or function in knee osteoarthritis. This does not mean that dose is unimportant; rather, the outcome depends on many more factors—baseline ability, tolerance, program compliance, and exercise type. [43]

Therefore, a good plan is not built on the principle:

"Everyone, 20 squats three times a day,"

And according to the principle: current level → tolerable load → gradual increase → reaction assessment.

What to do during an osteoarthritis flare-up

An exacerbation does not necessarily require a complete cessation of all movement.

If the joint becomes noticeably more painful, it is reasonable to temporarily reduce the amount of stress that is causing the pain, for example, replacing a long walk with a shorter one or heavy exercises with lighter options.

However, prolonged complete immobility is usually undesirable. The NHS specifically recommends not to completely stop moving the joint when experiencing joint pain. [44]

If flare-ups occur frequently, are severe, or are accompanied by unusually large swelling, you should review the diagnosis and program with your doctor or physical therapist.

A suddenly hot, red, and extremely painful joint should not be automatically considered a normal “exacerbation of arthrosis”: a similar picture is possible, for example, with gout or an infection.

What if it's rheumatoid arthritis?

In inflammatory arthritis, the principle is also not limited to constant rest. NIAMS indicates that exercise helps maintain muscle strength, mobility, and flexibility in rheumatoid arthritis. [45]

But if a joint is actively inflamed, swollen, and acutely painful, the load must be adjusted. Sometimes, the intensity of a specific joint is temporarily reduced, while maintaining movement in other body parts and within an easily accessible range.

This is another reason not to apply the phrase "movement heals joints" to every condition. Physical activity is useful as part of treatment, but the type and dosage depend on the diagnosis and disease activity.

Movement after injury and surgery

After a fracture, ligament reconstruction, meniscus surgery, or joint replacement, the question is no longer whether movement is beneficial at all. What's more important is when, within what range, and with what load it is permitted.

Modern rehabilitation typically utilizes gradual restoration of motion and function, but the allowable load is determined by the specific surgery, tissue condition, and stage of healing.

Therefore, a person after surgery should not apply the program for ordinary osteoarthritis or the advice of a healthy runner.

In this situation, the recommendations of the surgeon and physical therapist take precedence over general internet advice that “joints need more movement.”

How a sedentary lifestyle affects joints

The problem with prolonged sitting isn't that after a few hours, the cartilage "stops getting nourished." The cumulative effect of inactivity is far more important.

When most of the day is spent inactive, it is more difficult for a person to maintain muscle strength, aerobic fitness, and overall motor ability.

Therefore, it's more beneficial to think not only about evening exercise but also about daily movement. The World Health Organization emphasizes that all physical activity counts—walking, cycling for transportation, household chores, and sports. [46]

For someone who works at a computer, getting up periodically and moving a little makes practical sense: it reduces the duration of continuous immobility and helps maintain the habit of regularly using joints and muscles.

Body weight and movement work together

For the knee and hip joints, body weight affects the mechanical load during walking and other movements.

Therefore, for lower extremity osteoarthritis and overweight, current recommendations typically combine exercise and weight loss rather than pit these strategies against each other.

NICE lists both physical activity therapy and weight control as the main non-drug treatments for osteoarthritis.[47]

The American College of Rheumatology also makes a strong recommendation for weight loss for people with knee or hip osteoarthritis and who are overweight or obese; the effect is enhanced when combining weight loss with exercise.[48]

But this doesn't mean a person should first lose weight and only then start exercising. These processes can usually be carried out in parallel with a load appropriate to one's current ability.

How to start moving if your joints haven't been exercised for a long time

The most common mistake is trying to immediately return to the level a person had several years ago.

If your joints and muscles haven't been stressed in a long time, it's best to start with a volume that feels manageable and increase it in small steps.

For example, someone who currently only walks for errands doesn't necessarily need to commit to an hour of brisk walking every day. A good starting point could be short walks and a few simple strength exercises using bodyweight or an elastic band.

The reaction is then assessed over the next 24 hours and the duration, resistance or number of repetitions is gradually increased.

NIAMS also recommends starting an exercise program slowly and giving your body time to adapt to the new level of activity.[49]

If pain, weakness, instability, or fear of movement significantly interfere with your ability to begin on your own, it may be more beneficial to consult a physical therapist than to put off movement indefinitely.

How to understand that the load has been selected correctly

A good workout doesn't have to be felt at all.

After classes the following is possible:

• moderate muscle fatigue;
• mild, unusual muscle soreness the next day;
• short-term moderate discomfort in a chronically painful joint.

More alarming:

• sharp or sudden pain during movement;
• noticeably increased joint swelling;
• new instability;
• inability to bear weight normally on the limb;
• impairment that persists significantly longer than the normal post-exercise response.[50]

If after a session a person feels roughly at their original level the next day, this often means that the load is being tolerated.

If each workout takes you out of your normal routine for several days, the progression is too aggressive or requires assessing another cause of the pain.

Should you be afraid of clicking and crunching sounds while driving?

The sound in the joint itself does not allow us to determine the condition of the cartilage.

Clicking, crepitus, and other sounds can occur due to tendon movement, changes in pressure in the joint, and the characteristics of the articular surfaces.

If a joint simply makes sounds, but movement is painless and there is no swelling, locking, or instability, the sound itself is usually not a reason to stop moving it.

But a new painful click after an injury, blocking of the joint, or the inability to fully bend or straighten it require a separate assessment.

So, “crunching = cartilage wearing away” is another overly simple explanation of complex joint mechanics.

When you need to temporarily limit your movement and consult a doctor

Not all joint pain needs to be worked out on its own.

The NHS recommends seeking urgent medical attention if a joint is painful, hot, and swollen, especially if the person also feels unwell or has a fever. This may be consistent with a joint infection or other acute inflammation. [51]

Following injury, more urgent evaluation is required for severe pain, inability to walk or bear weight on the joint, obvious deformity, and sensory disturbances.[52]

You should schedule a visit with a doctor or physical therapist if the pain regularly interferes with your daily life or sleep, swelling recurs, the condition worsens, or home remedies do not provide improvement.

So, the principle of "movement is beneficial" doesn't negate the need for diagnosis. It simply means that prolonged, unjustified rest shouldn't be the universal answer to any chronic joint problem.

What is often misunderstood

"Cartilage wears away with every step."

This model is not supported by the current understanding of osteoarthritis. The disease affects the entire joint and is associated with multiple biological and mechanical factors; NIAMS explicitly notes that osteoarthritis does not arise simply from normal "wear and tear." [53]

"If a joint hurts, it's best not to put any strain on it at all."

For chronic osteoarthritis, this is usually not true. Individually tailored exercises are the main recommended treatment, although they may cause some temporary increase in discomfort at first. [54]

"Running is sure to ruin your knees."

Modern systematic reviews do not show a higher prevalence of knee osteoarthritis in casual recreational runners compared to non-runners. However, this does not automatically generalize to high-volume professional sports or running after a serious injury. [55]

"Swimming is better than walking because there is no stress on the joints."

The load in water is indeed less, but that doesn't make the lack of load ideal. Strength, endurance, and adaptation to normal bodyweight loads are also beneficial for joints and the entire musculoskeletal system.

"The harder the workout, the better for the joint."

No. Very high cumulative loads, especially when combined with injuries or long-term occupational squatting and kneeling, differ from moderate physical activity and may be associated with an increased risk of osteoarthritis.[56]

"You have to move to literally drive nutrients into the cartilage."

Cartilage does indeed receive substances primarily by diffusion and responds to mechanical action, but experiments show that the transport of small nutrient molecules cannot be explained solely by the mechanical “pump” effect. [57]

A practical principle for healthy joints

For most adults, a smart strategy is not to choose one "cartilage exercise" but to combine regular daily movement with aerobic and strength training.

A person without joint disease can follow the general recommendations of the World Health Organization: 150-300 minutes of moderate aerobic activity per week and exercises for major muscle groups at least twice a week. You can start with a much smaller volume and gradually work up to these values. [58]

If osteoarthritis is already present, the core idea remains the same, but the program becomes more individualized. A good choice is a type of movement that a person can regularly perform and tolerate: walking, cycling, aquatic exercise, strength training, or neuromuscular training. Neither NICE nor the American College of Rheumatology recommends one universally best option for all patients. [59]

After an injury or surgery, the healing process must be taken into account. And if a new joint becomes hot, very swollen, or acutely painful, a diagnosis is needed first, rather than trying to "get over it."

Key points from experts

David Hunter is a professor of rheumatology at the University of Sydney, the Florence and Cope Chair of Rheumatology, and a co-director of Sydney Musculoskeletal Health. The University of Sydney acknowledges his expertise in osteoarthritis and his involvement in the development of clinical guidelines. In a public review of the Australian guidelines, Hunter articulated a principle that aligns well with current international recommendations: exercise and lifestyle changes should be central to the treatment of osteoarthritis, not postponed until medications fail. [60]

Kim Bennell is a Redmond Barry Distinguished Professor, Director of the Centre for Health, Exercise and Sports Medicine at the University of Melbourne, and a researcher in non-pharmacological treatments for osteoarthritis. Her official university profile lists exercise and physical activity among her key research areas. A 2024 Cochrane Review update, prepared by a research group she co-authored, analyzed 139 randomized trials; the authors concluded that exercise, on average, improves pain and physical function in knee osteoarthritis, although the effect size varies and the quality of evidence for all outcomes is not high. [61]

Søren T. Skou, PhD, MSc, PT, is a professor at the University of Southern Denmark, an expert in exercise therapy for osteoarthritis, and a co-developer of the GLA:D program. His university credentials reflect his long-standing expertise in exercise and physical activity in chronic diseases. The GLA:D program, which he developed together with Ewa Roos, translates clinical recommendations into practice: patient education is combined with supervised neuromuscular exercises for people with knee and hip osteoarthritis symptoms. [62]

Frequently Asked Questions

Is it necessary to walk every day for healthy joints?

Daily walking is a good option for regular activity, but there is no set number of steps specifically "for cartilage." General physical activity, strength training, and gradual adaptation are more important. [63]

Is it true that movement restores cartilage?

No, that's too strong a statement. Movement creates a normal mechanical environment for articular cartilage and improves the function of the entire joint, but regular exercise is not a proven way to restore cartilage already lost in osteoarthritis.

Is it possible to play sports if you have arthrosis?

Yes, most people with osteoarthritis are not only allowed but also recommended to exercise. The type and intensity of exercise should be tailored to their symptoms and physical fitness. [64]

What is better for sore knees - walking or cycling?

There's no universal winner. Walking is better for training bodyweight tolerance, while cycling provides a lower-impact aerobic workout. The appropriate option is the one that a person tolerates best and is able to do regularly.

Is swimming beneficial?

Yes, water exercise is recommended for osteoarthritis and is especially helpful if land exercise is still too painful. [65]

Is it possible to run after 50 years?

Age alone is not a barrier. Joint health, cardiovascular fitness, previous injuries, and the gradual increase in load are all factors. Available research does not show an automatic increase in the risk of osteoarthritis from regular recreational running. [66]

Can running make existing osteoarthritis worse?

Some people may find running difficult to tolerate, but observational data do not indicate that self-selected running necessarily accelerates the structural progression of knee osteoarthritis. The decision depends on the individual patient. [67]

Should I exercise through pain?

Minor temporary discomfort with osteoarthritis is normal, especially at the beginning of the program. Severe or sharp pain, significant swelling, or prolonged worsening of the condition indicate that the load should be reduced and, if necessary, discussed with a specialist. [68]

Are squats good for your knees?

Squatting is a normal movement pattern and an effective strength exercise when its depth, resistance, and volume are appropriate for a person's capabilities. Certain injuries or severe pain may require modification.

Are non-weight-bearing exercises necessary to "give the joint a rest"?

Sometimes, yes. Cycling and water can temporarily reduce the load on a painful joint while maintaining mobility. However, most people don't need to completely avoid weight-bearing on a permanent basis.

What is better for joints: stretching or strength exercises?

They address different objectives. Stretching and range-of-motion exercises improve mobility, while strength training increases the muscles' ability to perform and control movement. A complete program often combines several components. [69]

If your knees are crunching, should you move less?

The sound itself, without pain, swelling, blockage, or instability, is usually not sufficient reason to limit activity. A painful new popping sound after an injury requires separate evaluation.

How long does it take for movement to help with osteoarthritis?

There is no set timeframe. The effect depends on the initial function, the type of exercise, and the regularity. In clinical studies, programs typically last weeks or months, so expecting sustainable results after just one or two workouts is unrealistic. [70]

What's worse for joints: too much movement or too little?

Both extremes can be problematic, but for different reasons. Insufficient activity impairs muscle strength and function, while excessive, poorly adapted exercise increases the risk of injury and overuse. The optimal level is a regularly performed load that the body can tolerate and gradually increase.

Main

Joints are not mechanical components that inevitably wear down with use. They are a living tissue system adapted to mechanical loading. Movement maintains muscle strength, mobility, and motor control, and cartilage experiences natural cycles of loading and unloading. Short-term changes in cartilage after walking or running are not the same as its destruction. [71]

In osteoarthritis, this idea has particularly practical implications: exercise is now a mainstream treatment. NICE recommends therapeutic exercise for all patients with osteoarthritis, and the American College of Rheumatology strongly recommends exercise for knee, hip, and hand conditions. [72]

The main limitation is dosage. Regular, gradual activity and heavy, repetitive loads, professional sports, or training after an injury are not the same thing. Significant risk to the joint is primarily created by tissue damage and loads that exceed the joint's ability to recover. [73]

Therefore, the most reasonable formula for joints is: move regularly, strengthen muscles, increase the load gradually and respond not to the fact of movement itself, but to persistent pain, swelling, loss of function and other signs that a specific load is still beyond the joint's capabilities.