Plenty of people can walk on the flat all day, then feel a sharp or grinding knee pain the moment they head down a flight of stairs. Descending loads the front of the knee far more than climbing does, which is why going down is so often the movement that gives the problem away.
Knee pain that only appears once you start running follows a different pattern, covered in PhysioHub's guide to knee pain when running.
Going downstairs asks your quadriceps to work while lengthening, controlling your body weight against gravity, and it does so with the knee bent and the kneecap pressed firmly into its groove. That combination places some of the highest loads of any daily activity through the front of the knee. If the kneecap is not tracking smoothly or the quads cannot control that load well, the tissue around the joint gets irritated and complains most on the way down. The NHS overview of knee pain lists the common culprits.
The most reliable fix is progressive strengthening of the quadriceps and hips, so the muscles can control the descending load the knee cannot handle right now. Short-term tweaks help too: leading with the stronger leg, using a handrail, and reducing deep knee bends while things settle. Most patellofemoral pain improves substantially with a consistent programme over several weeks. Realistic timelines are covered in how long does physiotherapy take to work?
The question that brings most of these knees in is whether stairs hurting means the joint is wearing out. Alex, a HCPC-registered physiotherapist, answers it several times a week, and for the majority of people the answer is no.
Going down stairs loads the knee at several times body weight while the quadriceps works to control the drop, which is why it is often the first thing to hurt and the last to come right. That load also makes stairs a useful test rather than only a symptom. Kneecap pain, joint surface changes and a meniscal problem all behave differently under it: where the pain sits, whether the knee catches or gives way, and how quad and hip strength measure up will usually separate them inside one session. Most of the recovery then comes from rebuilding that strength, which is measurable and climbs steadily over a course of sessions.
To find out which of those you are actually dealing with, book an assessment.
Should I stop using stairs?
No need. Modify how you descend for now, but keep moving. Total avoidance tends to leave the muscles weaker and the problem lingering.
Does grinding or clicking mean damage?
Not on its own. Painless noise is very common and usually harmless. It matters when it comes with pain, swelling or the knee giving way.
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