Why The Front Of Your Knee May Hurt During Stairs, Squats, Or Exercise

Your knee feels fine while you're sitting at your desk.

Then you stand up after a long meeting and notice an ache around your kneecap.

Maybe stairs have become uncomfortable. Squats suddenly bother you. Or you recently increased your running distance and now the front of your knee starts hurting halfway through your workout.

One possible explanation is patellofemoral pain syndrome, commonly called runner’s knee.

Despite the nickname, you do not have to be a runner to develop it.

Patellofemoral pain generally causes discomfort around or behind the kneecap and may become more noticeable during activities that repeatedly load the knee while it is bent.

At Z-2-H Family Med & Urgent Care, our providers can evaluate appropriate non-emergency knee and musculoskeletal concerns and help determine whether patellofemoral pain or another condition may be contributing.

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What Is Runner’s Knee?

Runner’s knee is a common name for patellofemoral pain syndrome.

The patella, or kneecap, sits at the front of the knee and moves within a groove at the end of the thigh bone as the knee bends and straightens.

Patellofemoral pain involves discomfort associated with the area where the kneecap interacts with the thigh bone.

The condition can be influenced by several factors rather than one single injury.

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Where Does Runner’s Knee Hurt?

Pain is commonly felt:

• Around the kneecap
• Behind the kneecap
• At the front of the knee

Some people describe a broad ache and have difficulty pointing to one exact spot.

This differs from certain injuries that produce very localized pain along one side of the knee.

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What Does Runner’s Knee Feel Like?

Symptoms may include:

• Dull aching
• Soreness
• Pressure
• Discomfort around the kneecap
• Pain after activity
• Pain while the knee is bent
• Mild stiffness

The pain may initially be occasional and gradually become more noticeable if aggravating activities continue.

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Why Does It Hurt Going Up Stairs?

Climbing stairs requires the knee to bend while the leg supports your body weight.

This increases the forces around the patellofemoral joint.

If the area is already irritated, stair climbing may reproduce symptoms.

Some people notice pain:

• Going upstairs
• Going downstairs
• Or both

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Why Does My Knee Hurt Going Downstairs?

Walking downstairs requires controlled bending of the knee while the thigh muscles help lower the body.

This can place substantial demand on the muscles and structures around the kneecap.

For some people with patellofemoral pain, going downstairs may actually feel worse than going up.

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Why Do Squats Hurt My Knees?

Squatting increases knee flexion and the load around the patellofemoral joint.

Symptoms may become more noticeable with:

• Deep squats
• Repeated squats
• Heavy resistance
• Poor movement control
• Sudden increases in training volume

That does not mean squatting is inherently bad for the knees.

The amount of load your knee can comfortably tolerate matters.

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Does Running Cause Runner’s Knee?

Running can contribute, but the answer is more complicated than simply saying running damages your knees.

Patellofemoral pain may develop when training demands exceed what the knee is currently prepared to tolerate.

Examples include:

• Increasing mileage quickly
• Adding more running days
• Increasing speed work
• Adding hills
• Returning after a long break
• Changing several training variables at once

Running itself is not automatically harmful.

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What Is A Training-Load Increase?

Your body adapts to exercise over time.

Problems can occur when training increases faster than your tissues can adapt.

For example:

5 MILES PER WEEK → 15 MILES PER WEEK

may be a much bigger jump than your knee is accustomed to.

Gradual progression generally gives the body more time to adjust.

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Can Walking Cause Runner’s Knee?

Yes.

Despite its name, patellofemoral pain can affect:

• Walkers
• Hikers
• Gym-goers
• Athletes
• Workers
• People who don't exercise regularly

Long walks, hills, stairs, or sudden increases in activity may aggravate symptoms.

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Can Hiking Cause Front Knee Pain?

Yes.

Hiking—particularly downhill hiking—can place repeated demand on the front of the knee.

Long descents require the thigh muscles to repeatedly control the body as the knee bends.

Someone who feels fine walking on flat ground may notice symptoms primarily during hills.

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Can Cycling Cause Runner’s Knee?

Cycling involves repeated knee bending.

Symptoms may be aggravated by factors such as:

• Sudden training increases
• High resistance
• Bike setup
• Repetitive loading

Persistent cycling-related knee pain may benefit from both medical evaluation and assessment of bike fit or training habits.

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Can Sitting Cause Runner’s Knee Pain?

It can become noticeable after prolonged sitting with the knees bent.

Some people notice discomfort after:

• Working at a desk
• Watching a movie
• Driving
• Flying
• Sitting in class

The knee may feel stiff or achy when standing afterward.

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Why Does My Knee Hurt At The Movies?

This is sometimes informally called the “movie theater sign.”

Keeping the knee bent for a prolonged period may aggravate patellofemoral discomfort.

Changing position or straightening the leg periodically may help some people.

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Does Runner’s Knee Cause Swelling?

Significant swelling is not typically the main feature of uncomplicated patellofemoral pain.

A small amount of discomfort or fullness may occur, but obvious swelling—particularly after an injury—may suggest another problem.

Significant swelling deserves evaluation.

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Does Runner’s Knee Cause Clicking?

Some people notice:

• Clicking
• Popping
• Grinding sensations

around the kneecap.

Joint noises by themselves do not necessarily mean something is damaged.

More attention is warranted when clicking occurs with:

• Pain
• Swelling
• Locking
• Instability
• Recent injury

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What Is Knee Crepitus?

Crepitus describes grinding, crackling, or popping sensations during joint movement.

It can occur in knees with and without pain.

Crepitus alone does not diagnose runner’s knee or arthritis.

The overall symptom pattern matters more than the noise itself.

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Is Runner’s Knee The Same As Arthritis?

No.

Runner’s Knee

Generally involves patellofemoral pain associated with movement and loading.

Arthritis

Involves changes within the joint and may cause:

• Pain
• Stiffness
• Swelling
• Reduced mobility

Symptoms can overlap, particularly in adults, so evaluation may be helpful when the diagnosis isn't clear.

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Runner’s Knee Vs. Meniscus Injury

The meniscus is cartilage inside the knee that helps distribute load.

Meniscus injuries may occur after:

• Twisting
• Pivoting
• Sports injuries

Possible symptoms can include:

• Joint-line pain
• Swelling
• Catching
• Locking

Runner’s knee more commonly produces diffuse discomfort around the kneecap.

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Runner’s Knee Vs. ACL Injury

An ACL injury often occurs during:

• Sudden direction changes
• Landing
• Pivoting
• Sports trauma

A person may experience:

• A pop
• Rapid swelling
• Instability
• Difficulty continuing activity

This is very different from the gradual front-of-knee ache typical of many patellofemoral pain cases.

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Runner’s Knee Vs. Patellar Tendon Pain

The patellar tendon connects the kneecap to the shinbone.

Patellar tendon problems tend to cause more localized pain below the kneecap, particularly during jumping or explosive activity.

Patellofemoral pain is usually felt more broadly around or behind the kneecap.

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Runner’s Knee Vs. IT Band Pain

Iliotibial band-related pain commonly occurs along the outside of the knee.

Runner’s knee typically affects the front of the knee.

The location of pain can provide useful clues.

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Runner’s Knee Vs. Osgood-Schlatter Disease

Osgood-Schlatter disease primarily affects growing children and teenagers.

Pain is usually located near the bony bump below the kneecap.

It often occurs during periods of growth in physically active adolescents.

This differs from classic patellofemoral pain around the kneecap itself.

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What Causes Runner’s Knee?

Patellofemoral pain usually does not have one single cause.

Possible contributing factors may include:

• Sudden training increases
• Repetitive knee loading
• Muscle weakness
• Movement mechanics
• Reduced flexibility
• Changes in activity
• Inadequate recovery
• Previous knee problems

Treatment often focuses on identifying which factors are relevant for the individual.

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Can Weak Hip Muscles Affect The Knee?

The muscles around the hips help control the position of the thigh during:

• Walking
• Running
• Squatting
• Stairs

Reduced hip strength or control may contribute to movement patterns that increase stress around the knee in some people.

That is why rehabilitation for knee pain often includes more than just the knee itself.

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Can Weak Thigh Muscles Contribute?

The quadriceps muscles help control the knee and kneecap.

Strengthening the quadriceps is commonly included in rehabilitation for patellofemoral pain.

The appropriate exercises and resistance level depend on symptoms and individual ability.

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Can Foot Position Affect The Knee?

Movement throughout the leg is connected.

Foot and ankle mechanics can influence how forces travel through the knee.

However, there is no single “perfect” foot position for everyone.

A healthcare or rehabilitation professional may assess the entire lower extremity when symptoms persist.

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Can Flat Feet Cause Runner’s Knee?

Some people with certain foot mechanics may experience altered loading through the leg.

However, having flat feet does not automatically mean you will develop knee pain.

Symptoms should be evaluated based on the whole person rather than one anatomical feature.

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Do Running Shoes Matter?

Comfortable, appropriate footwear may help support activity.

However, there is no single shoe that prevents runner’s knee in everyone.

Consider factors such as:

• Comfort
• Fit
• Activity type
• Shoe condition

Replacing severely worn footwear may be reasonable.

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Do You Need Expensive Running Shoes?

Not necessarily.

A higher price does not guarantee that a shoe will prevent knee pain.

Comfort and appropriate fit are generally more useful than choosing footwear based only on marketing claims.

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Should You Stop Running?

Not always.

The answer depends on how severe symptoms are.

Some people can continue with a temporarily modified program by reducing:

• Mileage
• Speed
• Hills
• Frequency
• Other aggravating activities

If every run significantly worsens pain, a greater reduction may be appropriate while the knee is evaluated and rehabilitated.

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Should You Push Through Knee Pain?

Repeatedly pushing through worsening pain is generally not a good strategy.

Pain can provide information that the current activity level exceeds what the knee is tolerating.

Instead of thinking:

PAIN = WORK HARDER

consider:

PAIN = REVIEW THE LOAD

This doesn't necessarily mean complete rest.

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Can Relative Rest Help?

Yes.

Relative rest means temporarily reducing the activities that aggravate symptoms while remaining active in ways the knee tolerates.

For example, someone may temporarily reduce running while continuing:

• Walking if comfortable
• Upper-body exercise
• Appropriate cycling
• Swimming
• Rehabilitation exercises

The exact plan depends on symptoms.

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Can Ice Help Runner’s Knee?

Cold therapy may provide temporary relief after aggravating activity.

If using ice:

• Wrap it in cloth
• Avoid direct skin contact
• Use it for a limited period

Ice can help with comfort but does not replace rehabilitation or load modification.

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Can Heat Help Knee Pain?

Some people prefer warmth when the knee feels stiff.

Others prefer cold after activity.

Either can be used for comfort when appropriate, but neither addresses all possible causes of knee pain.

Avoid extreme temperatures.

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What Exercises Help Runner’s Knee?

Exercise-based rehabilitation often plays an important role.

Programs may include strengthening for the:

• Quadriceps
• Hips
• Gluteal muscles
• Core

Exercises may also focus on:

• Movement control
• Balance
• Gradual activity progression

The right exercises depend on the individual.

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Are Squats Bad If You Have Runner’s Knee?

Not necessarily.

Squats may actually be part of rehabilitation when appropriately selected and progressed.

If deep squats are painful, modifications might include:

• Reducing depth
• Reducing resistance
• Adjusting repetitions
• Changing technique

The goal is to build tolerance without repeatedly causing significant symptom flare-ups.

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Can Step-Ups Help?

Step-ups may be used in some rehabilitation programs to strengthen muscles involved in stair climbing.

The height and resistance can be adjusted based on symptoms.

Painful exercises should not simply be forced.

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Do You Need To Stretch?

Stretching may be helpful when specific muscle tightness is contributing.

Potential areas include:

• Quadriceps
• Hamstrings
• Calves
• Hip muscles

Stretching alone, however, is not necessarily enough to resolve patellofemoral pain.

Strength and activity management often matter too.

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Can A Knee Brace Help?

Some patients find certain braces or taping techniques temporarily helpful.

Others notice little difference.

A brace should not be viewed as a substitute for identifying:

• Training errors
• Strength deficits
• Movement issues
• Another underlying injury

Use should be individualized.

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Does Knee Taping Work?

Patellar taping may provide short-term symptom relief for some patients.

It is sometimes used alongside:

• Exercise
• Strengthening
• Activity modification

It is not a guaranteed solution and technique matters.

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Do You Need Medication?

Over-the-counter pain medication may be appropriate for some patients.

However, medication choice depends on factors such as:

• Age
• Kidney health
• Stomach problems
• Heart conditions
• Bleeding risk
• Pregnancy
• Other medications

Ask a healthcare professional or pharmacist when unsure.

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Do You Need An X-Ray?

Not every patient with suspected runner’s knee needs an X-ray.

Imaging may be considered when:

• Symptoms are persistent
• There was trauma
• Arthritis is suspected
• Another diagnosis is being considered
• Examination findings warrant it

Your provider can determine whether imaging is appropriate.

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Do You Need An MRI?

MRI is not automatically required for typical patellofemoral pain.

It may be considered when:

• Significant injury is suspected
• The knee locks
• Symptoms persist despite appropriate treatment
• Another internal knee problem is suspected

Imaging decisions should be individualized.

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How Is Runner’s Knee Diagnosed?

Diagnosis usually begins with medical history and physical examination.

Your provider may ask:

• Where does it hurt?
• When did it start?
• Did you recently increase activity?
• Does it hurt on stairs?
• Does squatting hurt?
• Does sitting with the knee bent bother you?
• Was there an injury?
• Does the knee swell?
• Does it lock or give way?

These questions help distinguish patellofemoral pain from other knee conditions.

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What Happens During The Knee Exam?

A provider may assess:

• Knee movement
• Tenderness
• Swelling
• Strength
• Stability
• Kneecap movement
• Hip strength
• Walking or squatting mechanics

The exam may also evaluate whether another structure appears to be causing the symptoms.

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How Long Does Runner’s Knee Last?

Recovery varies.

Some people improve within weeks after appropriate activity changes and rehabilitation.

Others may experience symptoms for several months, particularly when:

• Pain has been present for a long time
• Training demands remain high
• Rehabilitation is inconsistent
• Contributing factors aren't addressed

There is no identical timeline for everyone.

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Can Runner’s Knee Come Back?

Yes.

Symptoms may recur if activity increases faster than the knee is prepared to tolerate.

A gradual return to exercise and maintaining appropriate strength may reduce recurrence risk.

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How Can You Help Prevent Runner’s Knee?

Helpful strategies may include:

• Increase training gradually
• Include recovery time
• Strengthen the hips and thighs
• Avoid sudden mileage jumps
• Wear comfortable footwear
• Vary training when appropriate
• Address pain early instead of repeatedly pushing through it

Consistency is usually more useful than dramatic changes.

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How Quickly Should You Increase Running?

There is no single percentage that is perfect for every runner.

Instead, increase based on:

• Current fitness
• Training history
• Symptoms
• Recovery
• Running frequency
• Intensity

Avoid suddenly increasing distance, speed, hills, and frequency all at once.

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What About Returning After A Break?

Your previous fitness level doesn't mean your body is immediately prepared for your previous training volume.

After time away:

START LOWER → BUILD GRADUALLY → WATCH SYMPTOMS → ADJUST

This applies to running and many other activities.

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Can Teenagers Get Runner’s Knee?

Yes.

Patellofemoral pain can occur in adolescents, particularly active teenagers involved in:

• Running
• Soccer
• Basketball
• Volleyball
• Dance
• Cheer
• Other sports

Persistent knee pain in a growing child or teenager should be appropriately evaluated rather than automatically blamed on “growing pains.”

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When Should You Schedule An Evaluation?

Consider having knee pain evaluated when:

• Pain keeps returning
• Symptoms persist
• Stairs repeatedly hurt
• Squatting becomes difficult
• Exercise is limited
• Pain interferes with daily activities
• The knee feels unstable
• Swelling develops
• Symptoms aren't improving with activity modification

Evaluation can help determine whether patellofemoral pain or another knee condition is responsible.

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When Does Knee Pain Need Prompt Medical Attention?

Seek prompt medical evaluation for:

• Significant swelling after an injury
• Inability to bear weight
• Visible deformity
• Severe pain
• Knee locking
• Significant instability
• Increasing redness or warmth
• Fever with a hot, swollen knee
• New significant numbness or weakness

These symptoms are not typical of uncomplicated runner’s knee.

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What If My Knee Is Red, Hot, And Swollen?

A red, hot, significantly swollen knee, particularly with fever or feeling ill, requires prompt medical evaluation.

This may indicate a problem other than runner’s knee, including possible infection or another inflammatory condition.

Do not assume it is simply from exercise.

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What If My Knee Swelled Immediately After An Injury?

Rapid swelling after a twisting or sports injury may suggest internal knee damage.

If you also experienced:

• A pop
• Instability
• Difficulty walking
• Severe pain

seek medical evaluation.

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What To Expect During Your Visit

During an evaluation, your provider may:

• Ask about your activity level
• Review recent training changes
• Examine the knee
• Check for swelling
• Assess knee movement
• Evaluate stability
• Assess strength
• Ask about locking or giving way
• Determine whether imaging is appropriate
• Recommend treatment or referral when indicated

The goal is to determine what is causing the pain, rather than assuming every active person with knee pain has runner’s knee.

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Why Choose Z-2-H Family Med & Urgent Care?

Our providers can evaluate many appropriate non-emergency knee and musculoskeletal concerns.

Depending on your symptoms, an evaluation may include:

• Medical history
• Knee examination
• Range-of-motion assessment
• Strength assessment
• Injury evaluation
• Review of exercise habits
• Conservative treatment recommendations
• Imaging or specialist referral when appropriate

If your symptoms suggest a more significant injury or another condition requiring a higher level of care, appropriate next steps can be recommended.

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Frequently Asked Questions

What Is Runner’s Knee?

Runner’s knee commonly refers to patellofemoral pain syndrome, which causes discomfort around or behind the kneecap.

Do You Have To Be A Runner To Get It?

No. Walkers, hikers, athletes, gym-goers, teenagers, and people who aren't regular runners can develop patellofemoral pain.

Why Does My Knee Hurt Going Downstairs?

Descending stairs increases the demand on the muscles and structures controlling the kneecap and may aggravate patellofemoral pain.

Why Does My Knee Hurt After Sitting?

Keeping the knee bent for a prolonged period can aggravate symptoms in some people with patellofemoral pain.

Are Squats Bad For Runner’s Knee?

Not necessarily. Squats can sometimes be modified and used during rehabilitation depending on symptoms.

Should I Stop Running?

Not everyone needs to completely stop. Temporarily reducing mileage, hills, speed, or frequency may be appropriate depending on symptom severity.

Does Runner’s Knee Cause Swelling?

Significant swelling is not typically the main feature. Noticeable swelling, especially following an injury, should be evaluated.

Do I Need An MRI?

Not automatically. Many cases can be evaluated clinically. Imaging may be appropriate when another injury is suspected or symptoms persist.

Can Teenagers Get Runner’s Knee?

Yes. Patellofemoral pain is common in active adolescents and may occur with running and other sports.

When Should Knee Pain Be Evaluated?

Consider evaluation when pain persists, repeatedly limits activity, is associated with swelling or instability, or isn't improving with reasonable activity modification.

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Call To Action

If front-of-knee pain is making stairs, squats, running, workouts, or even sitting for long periods uncomfortable, consider having your symptoms evaluated.

The providers at Z-2-H Family Med & Urgent Care can evaluate appropriate non-emergency knee and musculoskeletal concerns and help determine whether runner’s knee or another condition may be contributing.

We proudly serve patients in Brownwood, Keller, Arlington, and surrounding Texas communities.

Learn more about our Primary Care and Urgent Care services: https://www.z-2-h.com

Schedule an appointment: https://www.z-2-h.com

Knee Safety Reminder

Significant swelling after an injury, inability to bear weight, visible deformity, knee locking, major instability, or a red, hot, swollen knee with fever should receive prompt medical evaluation.