Patellofemoral Pain (Kneecap Pain)
Patellofemoral pain is pain around or behind the kneecap. It often builds gradually and is aggravated by stairs, squats, running or sitting with the knees bent. Diagnosis usually comes from the symptom pattern and examination; the location alone does not rule out other causes of knee pain.
Key points
- What usually helps
- Strengthening the hip and thigh muscles, which current guidelines support most strongly.
- What you can do now
- Walk on the flat, ease off downhill. Keep pain at 3 out of 10 or less.
- How long it takes
- Many people improve meaningfully over 6 to 12 weeks, though it can come back.
- When to see a doctor first
- Some signs need emergency care. Check the list before you start treatment.
Symptoms
Does this sound like you?
- Dull, aching pain around or under the kneecap (often described as 'behind' the kneecap)
- Pain that gets worse when you bend the knee with weight on it, such as squatting or taking stairs
- Pain after sitting a long time with the knees bent, such as in a movie theatre (the "theatre sign")
- A grinding or crackling feeling under the kneecap as the knee bends
- Pain during activities like running, jumping, or pivoting
Often alongside it
- Mild puffiness around the kneecap after activity
- A brief feeling that the knee might give way, without it actually buckling
- Stiffness after sitting still or resting for a long time
- Difficulty kneeling, or pain with direct pressure on the kneecap
- Pain on stairs, often worse going down
The pain I typically see builds up gradually, without a specific injury. It is often worse with activities that load the bent knee. My patients frequently tell me about pain climbing stairs, getting up from sitting, or after long car rides. The pain tends to be more noticeable during and after activity than at rest.
Before using this comparison, check when these symptoms need a doctor first.
When to see a doctor first
Go to emergency
The kneecap is still out of place, or the knee looks deformed
Possible kneecap dislocation. Go to emergency now. Do not try to push the kneecap back yourself, and do not walk on the leg
A limping child or teenager with sudden hip, thigh or knee pain, who cannot put weight on the leg, whose leg looks deformed, or who has a fever and feels unwell
Go to emergency now
A suspected slipped growth plate at the hip (SCFE)
Do not let the child walk on the leg, and seek emergency assessment today. In a teenager this can show up as a limp with hip, groin, thigh or knee pain, even when they can still walk
Get seen today
Significant swelling with warmth and redness
Possible infection or inflammatory arthritis. Same-day medical assessment, even without a fever, or go to emergency if you feel unwell
The kneecap slipped out and went back in, or the knee swelled up quickly after a twist
Possible kneecap dislocation or ligament injury. Get medical assessment today, even if the kneecap is back in place
Check with your doctor
The knee locks, or truly gives way so that you stumble or fall
Possible meniscus tear or other structural injury. See your family doctor or a sports medicine physician for assessment and imaging if needed
A child or teenager with a new limp that has no clear explanation
Get a prompt medical assessment before starting exercises. A hip problem can be felt only in the thigh or knee
Severe pain at rest or night pain
Not typical of patellofemoral pain. See your family doctor to look for other causes
Treatment
How it is treated
Main approach. Strengthening exercises for the hip and knee can reduce kneecap pain and improve function, and current guidelines support this approach most strongly. They target the muscles on the side of the hip (abductors), the hip's outward rotators (external rotators) and the front of the thigh (quadriceps).
Alongside it. Learning to move differently with feedback (movement retraining) and taping the kneecap can add to the benefit of exercise, by changing how the knee is loaded.
Managing it over time. Building up training gradually and doing exercises for knee control (neuromuscular training) may help reduce the risk of kneecap pain in active people and athletes.
A typical rehabilitation progression
Three phases, from settling symptoms to returning to full activity.
Recovery from patellofemoral pain is usually staged: calm the symptoms first, then rebuild the strength and capacity of the area, then return to your full activities. The phases below show how that can progress.
Phase 1Symptom Settling and Foundational Strength
Calm the knee down, get back to handling everyday loads like stairs and sitting, and start strengthening the hip and the front of the thigh (quadriceps) with simple exercises that target one area at a time. This follows the 2019 clinical guideline for kneecap pain, which gives strong evidence for combined hip and knee exercise as the first treatment to try.
Example exercises
- Side-lying (lifting the top leg while lying on your side), 3 sets of 12 to 15, focusing on the muscle on the side of the hip ()
- Short-arc quad extensions (straightening the knee from a slight bend, with a roll under the knee) through a pain-free range close to straight, 3 sets of 10 to 12
- Wall sit with the knees only slightly bent (less than 45 degrees), 3 sets holding 20 to 45 seconds
- with the leg turned slightly outward, 3 sets of 10 to 12 per side
Possible progression milestones
Pain under 3 out of 10 with daily activities like stairs and getting out of a chair, no increase in symptoms 24 hours after exercise, and being able to do the exercises with good form.
Phase 2Progressive Loading and Movement Quality
Load the knee through deeper bends while moving well, add exercises with your foot on the ground (closed-chain) and on one leg, and start working on the knee dropping inward ( collapse), which is often present. Movement retraining, guided by the same clinical guideline, runs through this phase.
Example exercises
- Goblet squat (holding a weight at your chest) to a box, 3 to 4 sets of 8 to 10, going deeper and adding load as symptoms allow
- Step-ups and step-downs, keeping the knee from dropping inward, 3 sets of 8 to 10 per side
- Split squats or reverse lunges, 3 sets of 8 to 10 per side
- Single-leg Romanian deadlift (hinging forward at the hip on one leg) for the muscles at the back of the hip and thigh and for control of the pelvis, 3 sets of 8 per side
- Spanish squat (a squat with a strap behind the knees) or a heavy, slow leg press to load the tendon and the front of the thigh, 3 sets of 8 to 10
Possible progression milestones
No pain or minimal pain (under 2 out of 10) with full-depth squats and single-leg work, good control on step-downs with no visible inward drop of the knee, and handling 2 to 3 strength sessions per week without a flare-up.
Phase 3Return to Sport, Running, and Higher Loads
Bring back the specific demands of your activity, whether that is running, sports with quick changes of direction, or recreational training. The emphasis is on jumping and landing (), running form and a maintenance plan you can keep up, since the clinical guideline notes that symptoms commonly come back without ongoing exercise.
Example exercises
- Graded return-to-run program using walk-run intervals, building up the amount of running first, then the pace
- Taking slightly quicker steps when running (a step rate, or cadence, 5 to 10% higher) to reduce the load on the kneecap joint
- Hops on two legs, then on one leg, to practise landing, 3 to 4 sets of 6 to 8
- Heavier squats and deadlifts on both legs, matched to your training goals
- Sport-specific drills (cutting, changing direction, jumping) added once the knee has shown it can handle the earlier work
Possible progression milestones
Full return to the sport or activity you want, with pain 2 out of 10 or less and no flare-up over the next 24 hours, single-leg hop tests within 10 to 15% of the uninjured side, and a maintenance strengthening plan you can keep up at least twice a week.
What you can do now
- Walk on the flat, ease off downhill. Walking on flat ground is usually well tolerated and keeps the knee moving without much pressure through the kneecap. The force on the kneecap joint rises as the knee bends further, which is why stairs, deep squats, steep downhill running and long periods of sitting with the knees bent tend to flare symptoms more.
- Keep pain at 3 out of 10 or less. During activity, aim to keep symptoms at or below 3 out of 10 and settled within 24 hours. A short rise after training is acceptable if it settles within a day. If symptoms are getting worse week over week, cut back how much or how hard you do until they turn around.These are example limits, not proof that an activity is safe for every cause of knee pain. Severe pain at rest or at night is not typical of kneecap pain, so see your family doctor to look for other causes.
- Take slightly quicker steps when running. If you keep running, run less for now, avoid steep downhills and take slightly quicker steps, about 5 to 10% more steps per minute. Quicker steps can reduce the load the knee has to absorb.
- Use tape or a sleeve short term. Taping the kneecap, or wearing a soft sleeve, can ease pain in the short term and help some people get through their exercises. It is an add-on, not a long-term fix: strength and how you move drive the lasting change.Use it alongside your exercises, not instead of them.
- Keep up your hip and thigh exercises. Exercise does not appear to damage the joint in kneecap pain, and inactivity is linked with worse outcomes. Keep doing your hip and thigh strengthening, and keep a maintenance routine going once you are better, because symptoms can come back.Get the form right before making an exercise harder.
What I use in clinic
- Hip and Knee Strengthening Exercise. Strong evidence shows that exercise for the muscles on the side of the hip (abductors), the hip's outward rotators (external rotators) and the front of the thigh (quadriceps) reduces pain and improves function.
- Movement Retraining with Feedback. Moderate evidence supports teaching better ways of moving during everyday and sport tasks, to change the mechanical factors that load the knee.
- Patellar Taping (Short-term). Tape on the kneecap may give immediate pain relief and improve the results of exercise therapy when used alongside exercise.
- Foot Orthoses (Select Cases). Off-the-shelf shoe inserts (orthoses) may help people whose feet roll in a lot (excessive pronation), when combined with exercise therapy.
Recovery
How long it takes
Many people see meaningful improvement over 6 to 12 weeks of exercise therapy, but recovery times vary, and symptoms can persist or come back even after treatment.
Symptoms can last for months or years and limit physical activity. Many people improve with exercise and education, though symptoms can persist or recur even after treatment, so progress, activity demands and your preferences guide the longer-term plan.
What changes the timeline
- How long symptoms have been present before treatment starts
- How consistently you do the exercise program
- Working on the load and strength issues that contribute may help
- Younger, more active people often respond faster
- Symptoms in both knees may take longer to settle
How I track it. I track changes in your pain during specific activities like stairs and squatting, whether you can do daily tasks without being limited, and how well you move when I test everyday movements
Similar conditions
Conditions that can feel similar
- Patellar Tendinopathy (Jumper's Knee)
- The pain sits in a small spot just below the kneecap (the inferior pole of the patella), rather than around or behind it. A single-leg squat on a slope (decline squat), or straightening the knee against resistance, brings it on. It is typically aggravated by jumping, landing and sprinting rather than by long sitting or stairs.
- Meniscal Pathology
- Tenderness along the joint line (the gap between the thigh bone and shin bone), often after a twisting injury or a deep squat. True catching, locking or giving way is more common. Twisting and bending tests that bring on the pain (McMurray or Thessaly tests) support the diagnosis, and long sitting is not the main trigger.
- Early Tibiofemoral Osteoarthritis
- Typically affects older people. Morning stiffness lasts under 30 minutes, the joint may grind or crackle (crepitus), and the pain is along the inner or outer joint line rather than around the kneecap. Stiffness after rest eases with movement, and imaging may show the joint space narrowing.
- Iliotibial Band Syndrome
- Sharp pain on the outside of the knee, near the bony bump at the end of the thigh bone (the lateral femoral epicondyle), not around the kneecap. It is common in runners and cyclists, and often starts at a consistent distance or pace of steps or pedalling (cadence). Tenderness over that bump, and pain with repeated bending and straightening around 30 degrees of knee bend, help tell it apart.
- Medial Plica Syndrome
- Pain on the inner side of the knee, with a tender band that can be felt over the inner end of the thigh bone (the medial femoral condyle). It often snaps or clicks as the knee bends and straightens. It can feel like patellofemoral pain, but it is more focused in one spot, and pressing directly on the band (the plica) brings it on.
- Referred Pain from the Hip
- Pain at the front of the knee, with turning the hip inward limited or painful, and hip tests that bring on the knee pain (FADIR or FABER tests). The knee itself often examines normally. It is more common with hip osteoarthritis or hip impingement (femoroacetabular impingement), so the hip should be checked in anyone with pain at the front of the knee.
Commonly confused with
Side-by-side comparisons for patterns that often get mistaken for patellofemoral pain (kneecap pain).
Questions
What patients ask me most
Is walking good for patellofemoral pain?
Walking on flat ground is usually well tolerated and is one of the first activities I reintroduce. It keeps the knee moving without the high pressure through the kneecap that deep squats or downhill running bring. The force on the kneecap joint is lowest when the knee is nearly straight and rises as the knee bends further, which is why stairs and long periods of sitting tend to flare symptoms more than walking does.
How long does patellofemoral pain take to heal?
Many people improve meaningfully within 6 to 12 weeks of consistent exercise therapy, and the 2019 JOSPT Clinical Practice Guideline (Willy et al.) recommends combined hip and knee strengthening as first-line care. Long-term follow-up studies show that symptoms can persist or recur in a substantial proportion of people, even after treatment. Progress, your activity demands and your preferences guide the longer-term plan, which is why I include maintenance strengthening as part of it.
Do I need an MRI for patellofemoral pain?
Usually not. Patellofemoral pain is diagnosed from your history and an examination, and what a scan shows does not reliably match symptoms. When symptoms fail to improve with appropriate rehab, or there is true locking or giving way, significant trauma, or signs pointing toward a meniscus or ligament injury, I flag it to your family doctor or specialist and refer you, because imaging may then change the plan. It is not the first step.
Why does my knee hurt going down stairs more than up?
Both directions load the kneecap joint far more than walking. Pooled data on healthy adults put the peak force on the kneecap joint at roughly 3.2 times body weight going up and 2.8 going down (Hart et al., BJSM 2022), so force alone does not explain it. Going down is a controlled lowering on one leg. The thigh muscle (quadriceps) has to work while it lengthens (eccentric work) to control the knee as it bends, and many people with patellofemoral pain find that harder and more uncomfortable. Some people notice going up more, which is also common.
Can I keep running with patellofemoral pain?
Often yes, with modifications. Reducing mileage, avoiding steep downhill running, and taking slightly quicker steps (a step rate, or cadence, around 5 to 10% higher) can help. Heiderscheit and colleagues showed a 10% increase in step rate meaningfully reduces the energy the knee has to absorb. Bramah and colleagues (2019) reported that a 10 percent increase in step rate was associated with improved running mechanics and clinical outcomes in runners with patellofemoral pain at 3-month follow-up. The pain rule I use is that symptoms stay at or below 3/10 during the run and settle within 24 hours. Persistent flares mean the load resets. These are example monitoring limits, not proof that running is safe for every cause of pain.
Is patellofemoral pain the same as runner's knee?
The terms are used interchangeably, but runner's knee is a general label that can include patellofemoral pain, iliotibial band syndrome and patellar tendinopathy. Patellofemoral pain specifically refers to pain around or behind the kneecap, usually aggravated by bent-knee activities like squatting, stairs or long periods of sitting. Sorting out which one is present changes the rehab plan significantly.
Will my knee get worse if I keep exercising?
Ongoing exercise does not appear to cause joint damage in patellofemoral pain, and inactivity is linked with worse outcomes. The goal is modifying load, not avoiding it. A short-term increase in symptoms after training is acceptable if it settles within 24 hours. If symptoms are worsening week over week, intensity or volume gets reduced until the trajectory reverses.
Are knee braces or taping helpful for patellofemoral pain?
They can be a useful short-term add-on. The 2019 JOSPT guideline supports taping the kneecap combined with exercise for short-term pain relief. Taping or a soft sleeve helps some patients tolerate their rehab exercises. It is not a long-term fix. Strength and how well you move drive the lasting change.
The science
The Science of Patellofemoral Pain (Kneecap Pain)
pain is pain around or behind the kneecap (patella), where it glides over the groove at the end of the thigh bone (femur). It is best understood as a load problem: the joint and the tissues around it have become sensitive, and activities that press the kneecap into its groove, such as stairs, squats and long periods of sitting with the knee bent, load it more than it can currently tolerate.
Scans are usually normal or show changes that are also common in people without pain, which is why the diagnosis is made from the history and examination. The older idea that the kneecap is "tracking badly" and needs to be pulled back into line has not held up well; changes in how the kneecap moves are seen in some people, but they do not explain most cases.
Pain-sensitive structures around the joint, including the bone under the cartilage, the joint lining and the fat pad, can all contribute. How much load the knee meets, how quickly that load has changed, and how strong the hip and thigh muscles are all affect how sensitive the knee becomes.
Contributing factors
Your kneecap acts like a pulley that increases the leverage of your quadriceps. The deeper the knee bends under load, the more force passes through the joint behind the kneecap, which is why stairs, squats, lunges and getting up from a low chair often hurt more than walking on the flat.
Weak hip and thigh muscles are a common finding. When the hip muscles ( and maximus) are weak, the thigh can drift inward during single-leg tasks, and weaker quadriceps leave the knee less able to control bending under load. Strengthening both the hip and the quadriceps is the approach with the most support in current guidelines.
Training load matters too. A sudden increase in running, jumping, hills or stair work is a common trigger. Foot posture and running mechanics play a part in some people, which is why running cadence and, in selected cases, foot orthoses are sometimes used alongside exercise.
Research
What the studies show
Hip and knee exercise together helped more than knee exercise alone at 3 months
A 2022 review that pooled 65 trials in people with kneecap pain (Neal and colleagues) found six treatments with benefits at 3 months: exercise aimed at the knee, exercise aimed at the hip and knee, combined treatments, shoe inserts (foot orthoses), hands-on treatment of the lower back, hip and leg (lower-quadrant manual therapy), and knee exercise combined with injections of a sugar solution around nerves (perineural dextrose injection). Exercise aimed at the knee reduced pain compared with control groups. Exercise aimed at the hip and knee reduced pain and improved function more than exercise aimed at the knee alone, with moderate to large effects. No treatment had been properly tested beyond 3 months, so longer-term benefits are uncertain.
Supports making hip strengthening a core part of rehab for kneecap pain rather than an optional extra. Because no treatment was tested beyond 3 months, the review cannot guide longer-term rehab, which suggests keeping up maintenance exercise after the first 3 months to help stop symptoms coming back.
Neal BS, Bartholomew C, Barton CJ, et al. (2022). Six Treatments Have Positive Effects at 3 Months for People With Patellofemoral Pain: A Systematic Review With Meta-analysis. J Orthop Sports Phys Ther. PMID: 36070427.
Hip strengthening and knee strengthening both reduced kneecap pain in a 2025 review
A 2025 review that pooled trials of strengthening for kneecap pain (Zhang and colleagues, European Journal of Medical Research) looked at hip strengthening and knee strengthening. Both were linked with less pain, and the pooled pain reduction was larger for hip-focused programs than for knee strengthening. These were two separate pooled results, not a head-to-head test in the same trials.
Supports including hip strengthening alongside exercises for the front of the thigh (quadriceps) early in rehab, rather than instead of them.
Zhang Z, Zhang Z, Zheng B, et al. (2025). Effects of lower limb strengthening training on lower limb biomechanical characteristics and knee pain in patients with patellofemoral pain: a systematic review and meta-analysis. Eur J Med Res. PMID: 39923086.
Guides on knee pain
Longer explanations of symptoms and scan-report wording.
- Pain Right Below the KneecapA single tender spot below the kneecap that flares with jumping, stairs, or deep squats. Most commonly patellar tendinopathy in active adults, and growth-plate conditions in young athletes.
- Suprapatellar Effusion (Fluid on the Knee)Extra fluid inside the knee joint, seen in the pouch above the kneecap. What the size words on a report mean, the usual causes by how quickly the swelling came on, and when to see a doctor first.
- Joint Space Narrowing in the KneeThe gap between the bones looks thinner than expected on an X-ray. What medial, tricompartmental and the severity words mean, how it relates to pain, and what the guidelines recommend.
Related Conditions
Conditions I commonly see alongside, or confused with, this one.
Lateral Hip Pain & Gluteal Tendinopathy
Hip muscle weakness is common in both, so rehab for either works on the hip
Hip Osteoarthritis
Hip arthritis can be felt in the knee, so the hip is checked in anyone with front-of-knee pain
Patella Fractures
A healed kneecap fracture can leave patellofemoral pain and stiffness behind
Getting back to it
Physiotherapy for patellofemoral pain (kneecap pain), built around the activity you want back.
