Why Does My Knee Hurt When Going Down Stairs but Not Walking? A Physical Therapist Answers

Patient Question

“My knee feels fine when I walk on flat ground, but every time I go down stairs, I feel pain around or behind my kneecap. Sometimes it happens when I squat or get out of a chair. Why does going downstairs hurt more than walking? Could this be a sign of arthritis or weak muscles, and can physical therapy help?”

The Short Answer

Knee pain when walking downstairs but not on flat ground can occur because descending stairs requires greater control of knee bending, quadriceps muscle activity, and management of forces across the kneecap joint.

One possible explanation is patellofemoral pain, a condition involving discomfort around or behind the kneecap. However, other conditions, including knee osteoarthritis, patellar tendon problems, and meniscal injuries, may produce similar symptoms.

Physical therapy may help by identifying limitations in strength, mobility, balance, and movement control. Treatment commonly includes progressive strengthening, activity modification, and functional training.

Pain when descending stairs does not automatically mean the knee is damaged or that surgery is necessary. An individualized examination can help determine appropriate next steps.

Why Does Going Downstairs Put More Stress on the Knee?

Walking on flat ground and descending stairs place different demands on the muscles and joints of the lower extremities. During level walking, the knee generally moves through a smaller range of motion than it does during stair descent. When stepping down, the knee must bend while the muscles control the body's downward movement.

The quadriceps muscles at the front of the thigh play an important role in controlling this movement through eccentric muscle activity, meaning they produce force while lengthening. As the knee bends under load, forces across the patellofemoral joint can increase. For someone with an irritated or sensitive knee, these additional demands may reproduce pain that is absent during ordinary walking.

Muscle performance, joint mobility, movement strategy, previous injuries, and current activity tolerance can all influence comfort.

What Is Patellofemoral Pain Syndrome?

Patellofemoral pain describes discomfort around or behind the kneecap, particularly during activities that load the knee while bent. The patella sits within a groove at the lower end of the femur and works with the quadriceps mechanism to help extend the knee and manage movement forces.

Symptoms may occur with stair negotiation, squatting, running, jumping, or prolonged sitting. Not everyone with these symptoms has patellofemoral pain. An examination helps determine whether the presentation fits this condition or warrants further medical evaluation.

Could Weak Quadriceps or Hip Muscles Contribute to Knee Pain?

The quadriceps help control knee flexion as the body lowers from one step to another. Reduced strength or endurance may make this activity more challenging, although weakness is not necessarily the only cause and pain itself can affect muscle activation.

Hip abductors, extensors, and external rotators also help manage pelvic and femoral movement during single-leg activities. A physical therapist can assess whether improving hip and knee muscle performance is appropriate.

Does Knee Alignment Matter When Walking Downstairs?

Hip, knee, ankle, and foot movement influences how forces are distributed during stair descent. Some patients move the knee inward, shift their trunk, reduce knee bending, or rely more on a handrail. These patterns do not automatically indicate damage. Human movement varies, and no single stair-descending technique suits everyone.

Rehabilitation focuses on whether adjustments improve comfort, control, and function.

Could Knee Arthritis Cause Pain When Going Downstairs?

Yes. Knee osteoarthritis is one possible contributor, particularly with persistent discomfort, stiffness, or reduced tolerance for weight-bearing activity. Osteoarthritis can involve changes in cartilage, bone, and surrounding tissues. Symptoms may include pain on stairs, stiffness after inactivity, swelling, or difficulty moving the knee.

However, pain during stair descent alone cannot establish osteoarthritis. Patellar tendon conditions, meniscal problems, previous injuries, and referred symptoms may also contribute.

Can Physical Therapy Help?

Physical therapy can play an important role in managing many forms of activity-related knee pain. At Nova Physical Therapy in North Hollywood, treatment planning begins with an individualized evaluation of symptoms, functional limitations, and goals.

• Quadriceps strengthening: Modified sit-to-stands, knee extensions, squats, and step-down exercises as appropriate.
• Hip strengthening: Progressive exercises for hip abductors, extensors, and related muscle groups.
• Movement retraining: Practicing stairs and other functional activities with symptom-guided adjustments.
• Mobility exercises: Addressing relevant knee, hip, or ankle restrictions.
• Balance and neuromuscular training: Improving single-leg control.
• Patient education: Activity modification, symptom monitoring, and gradual exercise progression.

Treatment should be individualized, especially following surgery or with significant joint symptoms.

What Does Research Say?

Clinical guidance supports exercise-based rehabilitation as a central treatment approach for patellofemoral pain. The American Physical Therapy Association's clinical summary describes anterior knee pain during squatting, running, stairs, and other loading activities.

A multidisciplinary guideline on anterior knee pain recommends individualized quadriceps- and/or hip-focused exercise therapy, often over 6–12 weeks, combined with education and adjustments according to symptoms and function. Evidence certainty varies, and no single exercise or passive treatment is guaranteed to work for everyone.

Mayo Clinic guidance describes clinical examination, activity modification, and rehabilitation as important components of care. Imaging may be appropriate based on clinical findings, but is not automatically necessary for every patient.

What Happens During a Physical Therapy Evaluation?

The therapist reviews the onset and location of pain, injury history, aggravating activities, and functional concerns. The examination may include knee and hip mobility, muscle performance, walking, balance, and functional movements. When safe, a step-down assessment may help identify how the patient controls knee bending and weight transfer.

Findings guide functional goals, rehabilitation planning, and decisions about whether medical referral is appropriate.

What Can You Do at Home if Going Downstairs Hurts?

For mild symptoms without significant injury, using a handrail, taking shorter steps, reducing repetitive stair activity, and slowing the pace may help. A temporary step-to pattern—both feet on each step—may also be useful. When descending, the more symptomatic leg is generally moved down first while the less symptomatic leg provides support, if safe for that person.

Avoid forcing movement through significant or worsening pain. Exercise selection and intensity should reflect the underlying condition and medical history.

When Should You Seek Medical Attention?

Seek medical evaluation for persistent or worsening pain or significant limits on daily activity. Prompt assessment is warranted with marked swelling, inability to bear weight, significant instability, or new inability to move the knee fully. Urgent assessment is appropriate following significant injury with deformity, or for a hot, swollen knee accompanied by fever or systemic illness. New numbness or weakness also warrants assessment.

Why Patients Choose Nova Physical Therapy — We Care

At Nova Physical Therapy, we believe rehabilitation should focus on more than temporarily reducing discomfort. We Caremeans listening to each patient's concerns, understanding how symptoms affect everyday life, and developing an individualized plan based on clinical findings and functional goals.

Our North Hollywood outpatient clinic serves patients from Burbank, Toluca Lake, Studio City, Valley Village, and surrounding Los Angeles communities. We emphasize patient education, progressive rehabilitation, and communication throughout care.

Learn more about our physical therapy services.

Frequently Asked Questions

1. Why does my knee hurt going downstairs but not upstairs?

Descending requires controlled lowering of the body and different quadriceps and patellofemoral demands. The cause varies by person.

2. Is knee pain when going downstairs a sign of arthritis?

It can be, but patellofemoral pain, tendon conditions, and other knee problems may cause similar symptoms.

3. Can weak quadriceps cause knee pain on stairs?

Reduced quadriceps strength or endurance may contribute to difficulty controlling descent, but an examination is needed.

4. Should I stop using stairs if my knee hurts?

Not necessarily. Temporary modifications may help; the right activity level depends on symptoms and clinical findings.

5. Can physical therapy help kneecap pain?

Exercise-based physical therapy may improve pain and function for some patients with patellofemoral pain.

6. Are squats bad for knee pain?

Squats are not inherently harmful. Depth, resistance, and frequency can be adjusted to individual tolerance.

7. Do I need an MRI for knee pain when going downstairs?

Not always. Imaging decisions depend on examination findings and whether results would change management.

8. Can knee pain improve without surgery?

Many knee conditions improve with conservative care, although some require further medical or surgical evaluation.

9. Can hip strengthening help knee pain?

Hip strengthening is often included in patellofemoral pain rehabilitation when appropriate to the individual's needs.

10. How long does physical therapy take for knee pain?

Timelines vary according to condition, symptom duration, activity demands, and response to treatment.

11. Is clicking in the knee dangerous?

Painless clicking is often not concerning. Clicking with pain, swelling, locking, or instability deserves evaluation.

12. When should I see a physical therapist for knee pain on stairs?

Consider evaluation when symptoms repeatedly interfere with stairs, exercise, work, or daily activities.

Schedule an Evaluation

If knee pain limits stair descent, squatting, exercise, or daily activities, an individualized evaluation may help identify contributing impairments. Nova Physical Therapy provides outpatient rehabilitation in North Hollywood, California.

Schedule an Evaluation at Nova Physical Therapy

Disclaimer

This article is for general educational purposes only and is not a diagnosis, individualized treatment prescription, or substitute for medical advice. Knee pain has multiple potential causes. Exercise should be individualized by an appropriately licensed professional. Physical therapy is provided within California's applicable scope of practice.

References

1. American Physical Therapy Association. Patellofemoral Pain: Clinical Summary.
2. Dutch Multidisciplinary Guideline on Anterior Knee Pain: Patellofemoral Pain and Patellar Tendinopathy.
3. Mayo Clinic. Patellofemoral Pain Syndrome: Diagnosis and Treatment.
4. Physical Therapy Board of California. Physical Therapy Practice Act.