Could this be patellofemoral pain

Often, yes: pain at the front of the knee on stairs fits a pattern clinicians commonly associate with patellofemoral pain syndrome, or PFPS. Mayo Clinic, AAOS and Cleveland Clinic all describe PFPS as pain around or under the kneecap that tends to flare when the knee is loaded in a bent position — on stairs, during squats, while kneeling, running, or after sitting for a long time with the knee bent. Cleveland Clinic also notes a detail many people recognise in clinic: going downhill or down stairs often feels worse than going up.

In simple terms, the kneecap is meant to glide in a groove at the lower end of the thigh bone as the knee bends and straightens. AAOS and Cleveland Clinic explain that when that movement is irritated or not tracking smoothly, the front of the knee can become painful. Even so, stair pain on its own is not a diagnosis. Front-of-knee pain can have other causes, so clinicians treat this as a recognisable symptom pattern rather than a verdict from one symptom alone.

Why stairs make it worse

Stairs combine three things the front of the knee often dislikes: bodyweight, a bent knee, and repeated loading. On the way down, that load is usually more obvious because the leg is not just stepping but controlling a lowering movement against gravity. AAOS and Cleveland Clinic both describe the kneecap as moving within a groove at the end of the femur during bending and straightening. If that movement is a little off, or the joint is already irritated, each step can increase pressure through the patellofemoral joint and make the pain easier to feel at the front of the knee.

A useful 2022 clue comes from squat research rather than a dedicated stair meta-analysis. In that systematic review, patellofemoral symptoms tended to worsen with deeper loaded knee flexion, especially around 60° to 90°, and with factors such as forward knee travel and thigh muscle imbalance. Stairs are not identical to squats, but the same broad idea fits everyday clinic patterns: the more the knee bends under load, the more stress may build around the kneecap, which helps explain why squatting, kneeling and stairs often cluster together.

This is rarely about one single damaged spot. The 2022 state-of-the-art review describes anterior knee pain as multifactorial, and common contributors named by Mayo Clinic and AAOS include overuse, repeated knee-bending activity, and weakness or imbalance around the hip and thigh. Those factors can change how force is shared through the leg, so the front of the knee becomes the part that complains first.

What to do first

The first move is usually to trim provoking load, not to stop moving altogether. Mayo Clinic and AAOS both describe this symptom pattern as being aggravated by repeated knee-bending tasks, so the early aim over the next few weeks is to calm things down by changing the dose: fewer unnecessary stair trips where possible, less repeated squatting or kneeling, and a temporary step back from activities that reliably stir up the front of the knee.

Common early adjustments include:

• breaking up long stair sessions when a lift or flatter route is available
• pausing deep knee bends, low squats or repeated lunges for now
• keeping walks, gym work or sport at a level the knee can settle after, rather than pushing through a steadily worsening ache

Exercise still matters. AAOS and the 2022 review on anterior knee pain support a physiotherapy-led approach built around quadriceps and hip strength, control of movement, and gradual reloading, because symptoms often reflect a mix of load and muscle function rather than one quick fix.

When it may be something else

Not every stair-related ache at the front of the knee is patellofemoral pain, and the useful divide here is not another long warning-sign list but whether the story still fits that common pattern. A knee that became painful after a recent twist, a direct blow, or a clear sporting injury needs a broader look. The same is true if the joint gives way, truly locks rather than just feels stiff, swells markedly, cannot bear weight, looks red and hot with fever, or cannot be moved normally.

Beyond patellofemoral pain, anterior knee pain can come from several other buckets. Tendon pain sits more in the soft tissues around the kneecap; cartilage or joint-surface problems may follow injury or wear; the fat pad beneath the patella can become irritated; and some pain is referred from elsewhere rather than starting in the knee itself. The 2022 state-of-the-art review makes the wider point that anterior knee pain is heterogeneous, with causes arising within the knee, around it, and sometimes outside it.

In clinic, the diagnosis is usually built from the history and examination first: how the pain started, whether there was trauma, where it is felt, and what movements reproduce it. Scans can be helpful when the pattern is unclear or another diagnosis is suspected, but an X-ray or MRI is not the diagnosis on its own.

When to get assessed and what the pathway looks like

Beyond the NHS warning signs already covered, the usual reason to seek assessment is persistence: front-of-knee pain that is worsening, keeps returning, or is still limiting sport, work or ordinary stairs after sensible load changes and rehab. In the AAOS and Cleveland Clinic descriptions of patellofemoral pain, many cases are managed conservatively, so the trigger for review is less about one painful day and more about symptoms that are not settling or are starting to narrow day-to-day function.

A specialist appointment is usually quite practical. The first part is the symptom story — when it started, whether there was a twist, blow or gradual overuse build-up — followed by an examination of movement, alignment and strength. In 2022, the state-of-the-art review on anterior knee pain reinforced that the pain driver may sit in the knee, around it, or even outside it, which is why step-down control, hip strength and quadriceps function often matter as much as pressing on the kneecap. Imaging may be used, but usually to answer a specific question rather than by default.

The pathway is normally sequential: diagnosis first, then conservative care, with surgery reserved for a defined structural problem rather than routine patellofemoral pain. That distinction matters because the label “anterior knee pain” is only a starting point. When that starting point remains unclear, or progress has stalled, London Cartilage Clinic in Harley Street offers specialist assessment, with consultations available via londoncartilage.com.

1. [1] Anterior Knee Pain: State of the Art. (2022). https://doi.org/10.1186/s40798-022-00488-x https://doi.org/10.1186/s40798-022-00488-x