Will Exercise Make My Knee Arthritis Worse, or Can Physical Therapy Help?

Will Exercise Make My Knee Arthritis Worse, or Can Physical Therapy Help? A Physical Therapist Answers

By Nova Physical Therapy | North Hollywood, CA

Patient Question

“I was told I have arthritis in my knee, and now I’m worried that walking, squatting, using stairs, or exercising will wear the joint out faster. Should I rest my knee, or can physical therapy and exercise actually help?”

The Short Answer

For many people with knee osteoarthritis, appropriately selected physical activity and exercise are important parts of managing pain and maintaining function.

Having osteoarthritis does not automatically mean you should stop using your knee.

The Centers for Disease Control and Prevention states that physical activity can help people with arthritis reduce joint pain and improve function, mood, and quality of life. Current CDC-recognized arthritis programs include walking, strengthening, aquatic exercise, Tai Chi, and structured knee-exercise programs. 

Knee osteoarthritis can affect people very differently. Symptoms may include:

• Pain during walking or stairs
• Stiffness after sitting
• Difficulty getting out of a chair
• Reduced walking tolerance
• Swelling
• Reduced knee mobility
• Difficulty squatting
• Reduced leg muscle performance

But pain severity does not necessarily correspond perfectly with what an X-ray looks like.

Physical therapy therefore focuses on the individual's symptoms, movement, muscle performance, activity tolerance, and functional goals, rather than treating an imaging report alone.

What Is Knee Osteoarthritis?

Osteoarthritis is a joint condition involving changes in cartilage, bone, and other joint tissues.

The knee is one of the joints commonly affected.

According to the CDC, approximately 33 million U.S. adults have osteoarthritis, and the condition commonly affects the knees, hips, hands, and spine. 

Symptoms can include:

• Joint pain
• Stiffness
• Swelling
• Reduced mobility
• Difficulty performing everyday activities

However, osteoarthritis should not be described simply as a knee being “worn out.”

The joint is living tissue, and symptoms are influenced by multiple biological, mechanical, behavioral, and individual factors.

Does Knee Arthritis Mean My Knee Is Bone-on-Bone?

Not necessarily.

Patients sometimes hear phrases such as:

“Your knee is bone-on-bone.”

That description may refer to significant joint-space narrowing seen on imaging, but imaging alone does not describe everything about a person's function.

Two people with similar X-rays can have very different symptoms and activity levels.

A physical therapist does not diagnose osteoarthritis from pain alone.

When a patient already has an established medical diagnosis of knee osteoarthritis, physical therapy focuses on the associated movement and functional limitations that may be appropriate for rehabilitation.

Does Exercise Wear Out an Arthritic Knee?

This is one of the most important misconceptions to address.

For most people with knee osteoarthritis, appropriate exercise should not automatically be viewed as damaging the knee.

The CDC specifically recommends physical activity for adults with arthritis and describes walking, cycling, swimming, dancing, Tai Chi, and other activities as joint-friendly options. 

Research also continues to examine different types and intensities of exercise rather than recommending inactivity.

A 2026 randomized controlled trial studied 120 participants with knee osteoarthritis who performed low-, moderate-, or higher-intensity treadmill walking or stationary cycling three times per week for 12 weeks.

All exercise groups were compared with a control group, and improvements were reported in pain and functional outcomes, with larger improvements in the higher-intensity group in this particular study. No serious adverse events were reported. 

That does not mean everyone with knee arthritis should immediately begin high-intensity exercise.

It does show why the simple message:

“Exercise will wear your knee out.”

does not accurately reflect current evidence.

Why Can My Knee Hurt Even If Exercise Is Helpful?

Exercise and pain have a more complicated relationship than:

pain = damage.

When someone begins exercising after a period of reduced activity, the muscles and joints are being exposed to demands they may not have experienced recently.

Temporary increases in:

• Muscle soreness
• Fatigue
• Stiffness
• Mild joint symptoms

can occur.

The CDC notes that some pain, stiffness, or swelling can occur after starting a new activity program and recommends beginning slowly and increasing activity gradually. Symptoms that remain severe or do not improve should be discussed with a healthcare provider. 

Physical therapy can help determine an appropriate starting point and progression.

Why Does My Knee Hurt When I First Stand Up?

People with knee osteoarthritis frequently report stiffness after sitting.

They may say:

“The first few steps are the hardest.”

After several steps, the knee may begin feeling easier.

A physical therapy evaluation may examine:

• Knee mobility
• Quadriceps muscle performance
• Hip muscle performance
• Sit-to-stand ability
• Walking
• Balance
• Functional loading

rather than assuming stiffness has only one cause.

Why Does Knee Arthritis Hurt on Stairs?

Stair climbing requires substantially more lower-extremity force than level walking.

The quadriceps must help control the knee while the hip and ankle also contribute.

Going downstairs can be particularly challenging because the leg must control the body's descent.

Rehabilitation may therefore include progressive exercises such as:

• Sit-to-stand
• Step-ups
• Controlled step-downs
• Squatting variations
• Lower-extremity strengthening

when appropriate.

The goal is not to permanently avoid stairs.

The goal may be to progressively improve the patient's capacity to perform them.

Why Does My Knee Hurt When I Squat?

Squatting increases the physical demand on the knee as depth and resistance increase.

That does not make squatting inherently harmful.

The appropriate squat depth and load depend on the individual.

A patient may begin with:

• Higher chair sit-to-stands

and later progress toward:

• Lower chair sit-to-stands
• Partial squats
• Deeper squats
• Loaded squats

depending on symptoms, goals, and physical capacity.

Someone who wants to garden, exercise at a gym, play with grandchildren, or return to recreational activities may eventually need substantially more capacity than simply walking across a room.

Should I Avoid Walking?

Usually, complete avoidance of walking is not the goal.

Walking is one of the joint-friendly activities identified by the CDC for people with arthritis. 

However, walking dosage matters.

Someone who currently tolerates five minutes comfortably may not respond well to suddenly walking five miles.

A more appropriate approach may be:

current tolerance → gradual progression → reassessment.

Walking programs can be adjusted according to:

• Duration
• Speed
• Terrain
• Frequency
• Symptoms
• Recovery afterward

Is Cycling Good for Knee Arthritis?

Cycling can be a useful aerobic activity for some people because it allows repeated knee movement while body weight is supported.

The CDC includes cycling among joint-friendly physical activities for arthritis. 

Bike setup and resistance can influence comfort.

Someone with limited knee bending may initially require a higher seat position, for example.

Physical therapists can help modify activities according to individual limitations.

Is Swimming Better Than Walking?

Neither is universally “better.”

Swimming and aquatic exercise can be useful for patients who tolerate water exercise comfortably.

Walking has advantages because it directly relates to everyday mobility.

Cycling may be preferable for another person.

The best activity is often one that is:

• Appropriate for the individual
• Accessible
• Tolerable
• Enjoyable enough to continue

The CDC specifically emphasizes choosing joint-friendly activities that people are likely to maintain over time. 

Does Strengthening Help Knee Arthritis?

Strengthening is an important component of many knee osteoarthritis exercise programs.

Muscles around the hip, knee, and ankle contribute to:

• Walking
• Standing
• Stairs
• Squatting
• Balance
• Getting out of a chair

The CDC recommends muscle-strengthening activity as part of physical activity for adults with arthritis. 

Physical therapy strengthening may include exercises targeting:

• Quadriceps
• Hamstrings
• Hip muscles
• Calf muscles
• Trunk

depending on examination findings.

Do I Need Stronger Quadriceps?

Quadriceps muscle performance is often clinically important because these muscles help extend and control the knee.

But knee rehabilitation should not automatically consist of one quadriceps exercise.

A patient may also demonstrate limitations involving:

• Hip muscle performance
• Calf strength
• Balance
• Knee mobility
• Walking tolerance
• Overall conditioning

An individualized program addresses the deficits that appear most relevant to function.

Is Yoga Good for Knee Arthritis?

It may be useful for some people.

A systematic review and three-level meta-analysis published in 2026 analyzed 14 studies involving 1,183 participants.

The researchers found low-certainty evidence that yoga improved knee-osteoarthritis pain and physical function. Evidence for biomechanical and impairment-related outcomes was very low certainty. 

The findings are encouraging but should not be interpreted as proof that yoga is superior to other exercise.

Yoga can be one possible exercise option.

What About Tai Chi or Similar Slow-Movement Exercise?

Slow, coordinated exercise may also be appropriate for some patients.

A randomized controlled trial published in the September 2026 issue of the Journal of Back and Musculoskeletal Rehabilitation studied 66 adults with knee osteoarthritis.

Participants performed structured exercise alone or structured exercise combined with face-to-face or online Baduanjin, a traditional mind-body exercise involving coordinated movements and breathing.

Both Baduanjin groups showed improvements across measures of pain, function, balance, mobility, fear of movement, and sit-to-stand performance. 

This does not establish Baduanjin as necessary or superior for every patient.

It provides additional evidence that several forms of appropriately structured movement can be useful.

Is It Safe to Exercise If My Knee Is “Bone-on-Bone”?

Imaging severity alone should not determine an exercise prescription.

Someone with advanced radiographic changes may still be able to exercise, but the program may require modification according to:

• Symptoms
• Swelling
• Mobility
• Muscle performance
• Medical history
• Functional goals

Exercise decisions should be individualized rather than based solely on an X-ray phrase.

What If Exercise Makes My Knee Swell?

A small symptom response after unfamiliar activity may sometimes occur.

Persistent or substantial swelling deserves attention.

The exercise program may need modification in:

• Load
• Volume
• Range
• Frequency
• Exercise selection

Significant new swelling, particularly following trauma or accompanied by other concerning symptoms, may require medical evaluation.

Should I Stop Exercise During a Flare-Up?

Not necessarily.

Some people can continue modified activity during periods of increased symptoms.

That might mean temporarily changing:

• Resistance
• Walking distance
• Exercise range
• Repetitions
• Activity type

The goal is often to remain as active as reasonably tolerated rather than moving between extremes of doing nothing and doing too much.

The CDC similarly advises modifying activity when arthritis symptoms increase while trying to remain active when possible. 

Do I Need to Lose Weight Before Exercise Will Help?

No.

People do not need to reach a particular body weight before they can benefit from physical activity.

Weight management can be part of comprehensive osteoarthritis care for some patients, but exercise has benefits beyond weight change.

Nutrition and medical weight-management recommendations should be addressed by appropriately qualified healthcare professionals.

Physical therapists can focus on movement, exercise, physical capacity, and function within physical therapy scope.

Can Physical Therapy Help?

Yes, when knee pain and associated functional limitations are appropriate for physical therapy.

Treatment may include:

• Therapeutic exercise
• Progressive strengthening
• Knee mobility exercise
• Hip strengthening
• Balance training
• Walking progression
• Functional training
• Sit-to-stand practice
• Stair training
• Aerobic exercise
• Manual therapy when clinically appropriate
• Activity modification
• Patient education
• Home exercise

The objective is not simply to make an X-ray look different.

Physical therapy focuses on helping patients improve what they can do.

That may mean:

walking farther

getting out of a chair more comfortably

using stairs

returning to exercise

playing with grandchildren

or simply maintaining independence.

Do I Have to Exercise Forever?

Physical activity works best when it becomes part of long-term health rather than being viewed only as a temporary treatment.

That does not mean someone must perform the same rehabilitation exercises forever.

A program may evolve from:

rehabilitation exercises → independent strengthening → walking, cycling, swimming, gym exercise, yoga, Tai Chi, or other enjoyable activity.

The CDC's newly updated 2026 arthritis resources recognize numerous physical-activity programs, including GLA:D®, My Knee Exercise Program, Tai Chi for Arthritis, aquatic exercise, Fit & Strong!, and Walk With Ease. 

What Does Research Say?

The evidence supporting exercise for knee osteoarthritis is broad, and new 2026 research continues to refine how exercise may be delivered.

2026 Yoga Meta-Analysis

Zhou and colleagues analyzed 14 studies involving 1,183 people with knee osteoarthritis.

Yoga was associated with improvements in pain and physical function, although the certainty of evidence was low and results varied among studies. 

This means yoga may be useful, but it should not be marketed as a guaranteed or superior treatment.

September 2026 Randomized Trial

Yildirim and colleagues randomized 66 adults with knee osteoarthritis to structured exercise alone or structured exercise combined with online or in-person Baduanjin.

The combined programs showed improvements in several outcomes including pain, balance, mobility, function, fear of movement, and sit-to-stand performance. 

2026 Aerobic Exercise Trial

A randomized trial involving 120 participants compared three aerobic-exercise intensities with a control condition.

Participants exercised three times weekly for 12 weeks using treadmill walking or stationary cycling.

Improvements were reported in pain, WOMAC outcomes, and walking capacity, with larger changes in the higher-intensity group in this study. 

This should not be interpreted as a universal recommendation for high-intensity exercise. Appropriate intensity depends on individual health, symptoms, experience, and physical capacity.

Current Public-Health Guidance

The CDC states that physical activity can:

• Reduce arthritis pain
• Improve physical function
• Improve mood
• Improve quality of life

and encourages adults with arthritis to remain physically active according to their abilities. 

In June 2026, the CDC updated its list of arthritis-appropriate evidence-based interventions, which includes multiple structured physical-activity programs. 

The overall message from current evidence is:

Knee osteoarthritis is generally a reason to find an appropriate way to move—not automatically a reason to stop moving.

Why Is This Topic Especially Relevant Right Now?

September is Rheumatic Disease Awareness Month, and osteoarthritis is one of the conditions highlighted in public education about maintaining movement and function. 

It also overlaps with Pain Awareness Month, making questions about safe movement particularly relevant for people who have begun reducing activity because of persistent joint pain. 

The timing is especially useful because multiple relevant studies have appeared in 2026, including research on:

• Aerobic exercise
• Strength exercise
• Yoga
• Mind-body exercise
• Remote exercise delivery

For patients in North Hollywood and the greater Los Angeles area searching:

“Should I exercise with knee arthritis?”

“Does walking make knee arthritis worse?”

“Can physical therapy help bone-on-bone knee arthritis?”

or

“What exercises are safe for knee osteoarthritis?”

the evidence supports a much more encouraging message than simply being told to rest.

What Happens During a Physical Therapy Evaluation?

At Nova Physical Therapy, an evaluation for knee pain may include, when appropriate:

• Medical and symptom history
• Review of an established osteoarthritis diagnosis or relevant medical information
• Pain and activity history
• Knee mobility
• Hip and ankle mobility when relevant
• Lower-extremity muscle performance
• Walking
• Balance
• Sit-to-stand ability
• Squatting
• Stairs
• Functional movement
• Exercise tolerance
• Patient goals

The physical therapist may also assess how symptoms affect activities such as:

• Walking
• Work
• Exercise
• Household activities
• Stairs
• Getting out of a chair
• Recreation

Physical therapists evaluate and treat movement and functional impairments within their professional scope.

A physical therapy evaluation does not mean assuming that every patient with knee pain has osteoarthritis.

If the presentation suggests that additional medical evaluation is appropriate, referral or communication with another healthcare professional may be indicated.

When Should You Seek Medical Attention?

Knee pain can have many causes.

Seek appropriate medical evaluation for symptoms such as:

• Significant recent trauma
• Inability to bear weight
• Obvious deformity
• Rapidly increasing or substantial swelling
• A hot, significantly swollen joint
• Fever associated with significant knee symptoms
• New significant weakness
• Progressive numbness
• Significant calf swelling or pain
• Chest pain or shortness of breath
• Severe or rapidly worsening unexplained symptoms

Persistent knee symptoms that are not progressing as expected should also be appropriately reassessed.

Do not assume every episode of knee pain is simply arthritis.

Why Patients Choose Nova Physical Therapy

At Nova Physical Therapy, our mission is simple:

We Care.

Being told you have knee arthritis can change the way you think about movement.

Some patients begin avoiding:

• Walking
• Stairs
• Exercise
• Squatting
• Travel
• Recreation

because they worry that activity is damaging their knee.

Our goal is not to make patients afraid of movement.

We want to understand:

What do you want your knee to allow you to do?

Our treatment philosophy emphasizes:

• Evidence-based care
• Individualized rehabilitation
• Progressive strengthening
• Mobility when indicated
• Functional movement
• Walking and activity progression
• Patient education
• Appropriate exercise dosage
• Long-term physical activity

We focus on helping patients build physical capacity and participate in meaningful activities while recognizing that each person's osteoarthritis experience is different.

Frequently Asked Questions

Will exercise make knee arthritis worse?

Appropriately selected exercise is generally recommended as part of arthritis management and can improve pain and physical function. 

Does walking wear out an arthritic knee?

Walking should not automatically be viewed as wearing out the knee. The CDC identifies walking as a joint-friendly activity for people with arthritis. 

Should I rest if I have knee arthritis?

Complete inactivity is generally not the goal. Activity may need to be modified according to symptoms and individual capacity.

Is bone-on-bone arthritis too severe for physical therapy?

Imaging severity alone does not determine whether physical therapy is appropriate. Function, symptoms, goals, medical factors, and examination findings also matter.

Can physical therapy help knee osteoarthritis?

Physical therapy can address movement and functional limitations associated with knee osteoarthritis through individualized exercise, strengthening, mobility, activity progression, and education when appropriate.

Does strengthening help knee arthritis?

Strengthening is commonly recommended as part of arthritis exercise programs and can help address muscle-performance limitations affecting everyday function. 

What muscles should I strengthen?

The quadriceps are often important, but hip, hamstring, calf, and other muscle groups may also be relevant depending on examination findings.

Is cycling good for knee arthritis?

Cycling is one of the joint-friendly aerobic activities identified by the CDC. 

Is swimming good for knee arthritis?

Swimming and water exercise can be useful low-impact options for some people.

Is yoga good for knee osteoarthritis?

A 2026 meta-analysis found improvements in pain and physical function, although the certainty of evidence was low. 

Is Tai Chi good for knee arthritis?

Tai Chi is included among joint-friendly activities and CDC-recognized arthritis programs. 

Should exercise hurt if I have arthritis?

Some temporary discomfort may occur when beginning or progressing activity, but severe or persistent worsening should be assessed and the exercise program may need modification.

Why does my knee hurt after sitting?

Stiffness after rest is commonly reported with knee osteoarthritis, although symptoms alone do not establish a diagnosis.

Why does my knee hurt going downstairs?

Stair descent requires substantial lower-extremity muscle control and may expose limitations in strength, mobility, or loading tolerance.

Do I eventually need a knee replacement?

Not everyone with knee osteoarthritis requires joint replacement. Surgical decisions depend on multiple medical and functional factors and should be discussed with the appropriate orthopedic healthcare professional.

Schedule an Evaluation

If knee pain or stiffness is making it difficult to walk, use stairs, get out of a chair, exercise, work, or participate in everyday activities, Nova Physical Therapy can help determine whether physical therapy is appropriate.

Our licensed physical therapists provide individualized evaluations and rehabilitation programs focused on:

• Mobility
• Muscle performance
• Functional movement
• Walking
• Physical capacity
• Returning to meaningful activities

Contact Nova Physical Therapy today to schedule a comprehensive physical therapy evaluation in North Hollywood.

Disclaimer

This article is intended for educational and informational purposes only and does not constitute medical advice, diagnosis, prognosis, or individualized physical therapy treatment.

Knee pain, stiffness, swelling, and functional limitations can have many causes. Symptoms alone do not establish osteoarthritis or another medical diagnosis.

If osteoarthritis has been diagnosed by an appropriate healthcare professional, physical therapists may evaluate and treat associated movement and functional impairments within the physical therapy scope of practice.

Exercise selection, resistance, intensity, range of motion, frequency, and progression should be individualized according to the patient's health status, symptoms, physical abilities, goals, examination findings, and relevant medical guidance.

The discussion of higher-intensity exercise research in this article should not be interpreted as a recommendation that every person with knee osteoarthritis perform vigorous exercise.

Physical therapy and exercise cannot guarantee pain elimination, prevent progression of osteoarthritis, eliminate the possibility of surgery, or produce a specific outcome.

Seek appropriate medical evaluation for significant trauma, inability to bear weight, substantial or rapidly increasing swelling, a hot and significantly swollen joint, fever, progressive neurological symptoms, concerning calf symptoms, chest pain, shortness of breath, or other severe or rapidly worsening symptoms.

Individual results vary.

References

1. Centers for Disease Control and Prevention. About Physical Activity and Arthritis.
2. Centers for Disease Control and Prevention. Physical Activity and Self-Management Education Programs for Arthritis. Updated June 10, 2026. 
3. Centers for Disease Control and Prevention. Osteoarthritis.
4. Zhou J, Jawis MN, Li S. Effects of Yoga on Pain, Physical Function, and Biomechanical/Impairment Outcomes in Knee Osteoarthritis: A Systematic Review and Three-Level Meta-Analysis. Journal of Back and Musculoskeletal Rehabilitation. 2026;39(4):1170-1185. 
5. Yildirim A, Hosbay Z, Aksoy A. The Effect of Baduanjin on Pain, Balance, Function and Kinesiophobia in Individuals With Knee Osteoarthritis: A Randomized Controlled Trial. Journal of Back and Musculoskeletal Rehabilitation. September 2026;39(5):1739-1750. 
6. Song L, Meng Y. Effect of Aerobic Exercise of Different Intensity on Articular Cartilage Metabolism in Patients With Knee Osteoarthritis: A Randomized Controlled Trial. Medicine. May 29, 2026;105(22):e48913. 
7. Hinman RS, et al. FREquency of Strength Home Exercises for Knee Osteoarthritis Pain: Protocol for the FRESH Non-Inferiority Randomised Controlled Trial. Osteoarthritis and Cartilage Open. May 21, 2026. 
8. American College of Rheumatology. Rheumatic Disease Awareness Month: Empowering Movement, Enhancing Lives.

Current resources: CDC Physical Activity and Arthritis Guidance · CDC's updated 2026 arthritis exercise programs · 2026 knee osteoarthritis yoga meta-analysis on PubMed · September 2026 knee osteoarthritis exercise randomized trial · 2026 aerobic exercise randomized trial