Runner's knee (patellofemoral pain): what it is, why it happens, and the care options

An ache that follows the stairs

If you have a dull, aching pain around or behind your kneecap that flares when you go down stairs, squat, kneel, or stand up after sitting for a while, you are describing one of the most familiar knee problems there is. People often notice it during or after a run, but just as often it shows up in everyday life: getting out of a low chair, driving for a long stretch, or sitting through a movie with your knees bent — the so-called "theatre sign."

That pattern has a name: patellofemoral pain, sometimes called patellofemoral pain syndrome or, more casually, "runner's knee." It can be nagging and frustrating, especially when the very movements you want to do are the ones that hurt. But here is a reassuring starting point. For most people it is not a sign of serious damage inside the knee, it is usually diagnosed without scans or special tests, and it tends to improve with the right kind of active care. This guide explains what patellofemoral pain is, why it happens, how different kinds of practitioners approach it, what you can try yourself, and when it is worth getting a professional assessment.

What patellofemoral pain actually is

Your kneecap (the patella) sits in a shallow groove at the end of your thigh bone. As you bend and straighten your knee, the kneecap glides up and down in that groove, and your thigh and hip muscles help guide it. Patellofemoral pain is pain that comes from this kneecap-and-groove region — the front of the knee — rather than from a specific torn or broken structure [1][3].

The key thing to understand is what patellofemoral pain is not. It usually is not caused by a single injury, and it usually does not show up as obvious damage on an X-ray or MRI. In fact, imaging is typically unnecessary to diagnose it, because scans often do not explain the symptoms and the pain is diagnosed clinically — from your history and a physical examination — rather than from a picture [1][5]. One of the most useful clues clinicians rely on is simply whether squatting reproduces your pain [3][5]. Plain X-rays are generally reserved for cases that are not improving after several weeks, and then mainly to rule out other conditions rather than to confirm patellofemoral pain [5].

So what does cause it? The honest answer is that patellofemoral pain is considered multifactorial — several things tend to add up rather than one clear culprit [1]. A common thread is load: the tissue around the kneecap being asked to do more than it is currently conditioned for, whether from a jump in running distance, a new activity, or a return to sport after time off [1][3]. Factors such as how the hip and knee move and the strength of the surrounding muscles are often discussed, though the research on any single risk factor is mixed and far from settled [1]. It is common — affecting up to around one in five physically active adults, and a meaningful share of adolescents — so if you have it, you are in very large company [1].

How different practitioners approach it

There is no single "right" door to walk through for patellofemoral pain, and different regulated professionals bring different training and tools. Below is an honest look at how each discipline tends to approach it and what the evidence does and does not show. A useful thing to know up front: the strongest and most consistent evidence points to active, exercise-based care as the core of treatment, while most add-on treatments are described as short-term helpers rather than stand-alone fixes — and the size of the benefit varies a lot from person to person [1][2][3].

Physiotherapy

Physiotherapy is where the best-supported, first-line care tends to live. Physiotherapists usually assess how your hip, knee, and lower limb move and load, then build a progressive exercise program aimed at strengthening the muscles around the hip and knee and gradually rebuilding your tolerance for the activities that hurt.

Exercise therapy is the treatment with the clearest support. An international consensus statement developed by patellofemoral pain researchers recommends exercise therapy to reduce pain in the short, medium, and long term and to improve function over the medium and long term [2]. Importantly, the same consensus recommends combining hip-focused and knee-focused exercises rather than knee exercises alone, and notes that hip-focused work may be especially useful in the early stages [2]. A clinical practice guideline from the American Physical Therapy Association's orthopaedic academy reaches the same practical conclusion, describing exercise therapy — targeting both the hip and the knee muscles — as the best-supported approach, often with hip and trunk muscles emphasized early and knee-focused work added as you progress [3][5].

It is worth being honest about the quality of that evidence. A Cochrane systematic review found that exercise therapy may reduce pain and improve function compared with no exercise, but rated the certainty of the evidence as low, largely because the individual trials were small and varied [4]. In plain terms: exercise is the most reliable starting point we have, and it is low-risk and puts you in control — but it is not a guaranteed switch-off, and it works best when it is progressed sensibly over time rather than rushed.

Physiotherapists may also add short-term adjuncts to exercise. Patellar taping is one: guidelines describe tailored taping, combined with exercise, as something that may help reduce pain in the short term, while noting it is not a stand-alone treatment [2][3]. Prefabricated foot orthoses (shoe inserts) are another possible short-term adjunct, particularly for people whose feet roll inward more than usual, again used alongside exercise rather than instead of it [2][3]. The consensus is candid that the average pain reduction from orthoses may be small and that individual responses vary widely [2]. Several passive treatments, by contrast, are specifically not recommended: the physiotherapy guideline advises against using ultrasound, electrical stimulation, and dry needling for patellofemoral pain, because they have not been shown to help [3].

Chiropractic care

Chiropractors who treat knee pain typically combine hands-on care with exercise and activity advice. Practitioners in this field may use joint mobilization or manipulation around the knee, hip, or foot, along with soft-tissue work and a loading program.

Here the evidence calls for careful framing. The strongest thread again runs through exercise and combined care: consensus guidance supports combined interventions — exercise therapy paired with an adjunct such as manual therapy, taping, or foot orthoses — for reducing pain in the short and medium term [2]. In other words, hands-on techniques are best understood as something that may support an active exercise program, not replace it. It is also worth noting that spinal manipulation specifically has not been shown to help patellofemoral pain and is not recommended as a treatment for it [3]. The honest summary is that a chiropractor who centres your care on progressive exercise and load management, using hands-on treatment as a short-term comfort measure, is working in step with the evidence; hands-on treatment on its own has much weaker support.

Massage therapy

Massage therapists use hands-on soft-tissue techniques with the goal of easing muscle tension around the thigh, hip, and knee, improving comfort, and supporting your ability to keep moving. Practitioners in this field often work on the quadriceps, the outer thigh, and the muscles around the hip.

Direct, high-quality evidence for massage as a stand-alone treatment for patellofemoral pain is limited. Where soft-tissue work fits best is as part of the combined approach that guidelines support — a short-term adjunct alongside the exercise therapy that carries the strongest evidence [2]. Understood that way, massage can be a supportive, comfort-focused part of a broader plan, especially if it helps you stay active and stick with your exercises, rather than something expected to resolve the problem on its own.

What you can try yourself, and what to expect

Alongside any professional care, a lot of the day-to-day management is genuinely in your hands. The steps below reflect the general direction of the guidelines and reviews above and are low-risk for most people:

• Keep moving, but adjust the load. The common advice is to avoid or temporarily dial back the specific movements that flare your knee — deep squats, lots of stairs, a sudden spike in running — while otherwise staying as active as you comfortably can [5]. Long, complete rest tends to be less helpful than a smart, gradual adjustment.
• Build strength around the hip and knee. Because exercise targeting both the hip and knee muscles is the best-supported treatment, this is usually the centre of a home program [2][3]. A physiotherapist can tailor and progress the specific exercises, which often start with hip and thigh strengthening.
• Progress gradually. Rebuilding your tolerance a little at a time — rather than returning to full running or training all at once — is the general principle behind managing a load-related problem [1][3].
• Consider short-term add-ons if they help. Patellar taping or a simple prefabricated insert may take the edge off in the short term for some people, and are reasonable to try alongside your exercises — while remembering the evidence sees them as helpers, not fixes [2][3].
• Be cautious with anti-inflammatory expectations. Short courses of over-the-counter pain relievers may ease early pain for some people, but any benefit tends to be brief; they are not a substitute for the active care that drives longer-term improvement [5].

On timeline, patience is part of the treatment. Patellofemoral pain often improves with active care, but it can also be stubborn: a meaningful proportion of people still have some symptoms a year or more later, and recovery is usually gradual rather than sudden [1][5]. Longer-term studies suggest many people do well with a sustained home exercise routine, which is part of why guidelines emphasize continuing your exercises even as you feel better, rather than stopping the moment the pain eases [5]. If you are doing the basics for several weeks and seeing no change at all, that is a signal to get assessed rather than simply pushing through.

When to seek a professional assessment

Most front-of-knee pain is not an emergency, and much of it responds to the kind of active self-care above. But it is worth getting checked by a regulated health professional if any of the following apply:

• Your knee pain is severe, or it is not improving at all after a few weeks of sensible self-care.
• The pain began with a specific injury, a fall, or a twisting event, or you felt a "pop" at the time.
• Your knee is noticeably swollen, warm, red, locks or catches, gives way, or you cannot fully straighten or bend it.
• You have night pain that wakes you, a fever, or you feel generally unwell.
• You are unsure whether what you have is patellofemoral pain at all — the front of the knee can hurt for several different reasons.

These are prompts to get assessed, not a way to diagnose yourself. A proper history and examination is how patellofemoral pain gets distinguished from other causes of knee pain, and how any red flags get sorted out.

A note on getting the right help

Patellofemoral pain is common, usually not a sign of serious damage, and tends to respond to active care — but "usually" is not "always," and your knee is specific to you. No article can examine your knee, weigh your particular history and goals, or design and progress the exercise program that fits your situation best.

That is exactly what a regulated health professional is for. A family physician, physiotherapist, chiropractor, or other licensed practitioner can confirm what is actually causing your knee pain, check for the warning signs above, and help you build and adjust a plan — with exercise at its core and short-term adjuncts where they help. If one reasonable approach is not working after a fair trial, that is a reason to revisit the plan together, not to give up. The overall outlook is a hopeful one, and you do not have to figure it out alone.

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