Why do stairs DOWN hurt so much more than up? I can climb all day but coming down my knee wants to give way

Something I've never understood about my knees and I'm finally asking. On the flat I'm fine for miles. Going UP a hill or a staircase, honestly not bad, a bit of an ache but I keep pace with the group. Coming DOWN is another animal entirely. Sharp pain right at the front of the knee, sort of behind the kneecap, and this horrible feeling that the leg is about to fold under me. Saturday's walk had a long descent at the end and I was gripping gates and going sideways like a crab while everyone else nattered their way down.

Same at home. Up to bed no problem, down in the morning one step at a time holding the rail like it owes me money.

Surely coming down is LESS work? You're going with gravity, not against it. So why is the easy direction the one that hurts? And is the giving-way feeling something I need to worry about, because that's the bit that actually frightens me.

You've just described the exact way my arthritis introduced itself, years before the flat ever bothered me. Descents were the tell. I could go up three flights at work and then stand at the top like a man contemplating a cliff. My physio's phrase stuck with me: going up is an engine problem, coming down is a brakes problem, and arthritic knees hate braking. The muscles are lowering your whole body weight down each step under control, and all that braking happens across the front of the knee.

Once I understood I wasn't imagining it, I stopped feeling daft about taking descents slowly. The knee wasn't lying, the loading really is different.

Following this because my brother-in-law cheerfully informed me that pain going downstairs means you're bone on bone and it's replacement time, no arguments. Put me in a gloom for a week. My answer was to avoid stairs completely, lift at work, everything I need moved to the ground floor. Six months of that and my knee is worse, not better, and now my GOOD leg complains too. Starting to suspect the avoidance plan has backfired but I'd like to hear it from someone qualified.

walkinggroupsue said:

holding the rail like it owes me money

The rail is a tool, Sue, not a confession. Took me two years to accept that. The physio drills that finally made stairs civilised for me: up leading with my stronger leg, down leading with the sore one, so the stronger leg stays on the step above doing the slow lowering. One step at a time on bad days, both feet meeting on each step, and nobody on the stairs behind me has ever once cared. And push down properly through the rail with your arm, don't just hover a hand over it, the arm can take a genuinely useful share of the load.

I decided the rail is no different from my reading glasses. An aid I use so I can keep doing the thing, not evidence I've given up. My knees are still mine and I'd like them managed, which is why I got myself to a physio instead of the sofa.

Sue, the direct answer: coming down loads the knee far more than going up, and it loads a specific part of it. Pete's engine and brakes line is accurate. Descending, your quadriceps work eccentrically, meaning they lengthen under load while braking your body weight against gravity, and those braking forces are concentrated where the kneecap presses on the thigh bone, the patellofemoral compartment. The numbers are striking: walking on the flat puts roughly half your body weight through that joint, climbing stairs around two and a half times your body weight, and descending around three and a half times or more. So the "easy" direction is mechanically the expensive one, and cartilage worn behind the kneecap objects to descents long before the flat gives any trouble. Downhill paths count as slow-motion stairs, which is why the end of Saturday's walk found you out.

The giving-way feeling is usually reflex inhibition: pain briefly switches off the quadriceps, a protective reflex, rather than the joint structurally failing. It still deserves respect, and a knee that buckles regularly or locks solid needs examining rather than a forum's reassurance. Dennis, your brother-in-law needs a gentle correction on two counts. Descent pain points at the patellofemoral compartment, a common pattern within knee osteoarthritis, and it does not by itself mean bone on bone or an imminent replacement; that decision rests on how far the knee limits your whole life, as set out in the signs you may need a knee replacement. And your six-month experiment has demonstrated the second point for us: avoidance weakens the quadriceps, and weaker brakes make every descent cost more. The evidence-based direction is the opposite one, building the muscle that does the braking, with strengthening work such as sit-to-stand practice, cycling, and controlled step-downs when a physiotherapist judges the knee ready. Maureen's technique advice is exactly what physiotherapists teach, including pushing through the rail, which genuinely offloads the joint. A physiotherapist can tailor all of this to your knee, which no forum post can, and that referral is worth asking for by name.

Eight-week report. Saw a physio, who watched me come down two steps and diagnosed the whole thread in one sentence. I've been doing her quad programme plus two short bike sessions a week, and yesterday's walk ended down the same hill that broke me in April. Slow, rail where there was one, sore leg leading, and not frightening. Still my least favourite direction, but it's back to being a knee, not a cliff edge.

Best bit: I mentioned all this at the tea stop and two others in the group quietly admitted they dread descents too and thought it was just them. The crab-walking club has members everywhere, apparently. Thanks all, especially for the brakes explanation, which I've now repeated so often I owe Pete's physio royalties.