You can climb stairs after a knee replacement from the first few days. Most people are taught stairs by a physical therapist before they leave the hospital, one step at a time, holding a rail.
The rule is “up with the good, down with the bad.” Going up, your good leg leads. Going down, your operated leg leads. Normal stairs, one foot per step, usually come back somewhere around 6 to 12 weeks, and later for some people.
Going DOWN is usually harder than going up. That is normal, and it has a clear reason, explained below.
Your surgeon’s instructions come first. If they differ from anything here, use theirs.
How to go up and down stairs
In the early weeks you take one step at a time, bringing both feet onto each step before moving to the next. Hold the rail with one hand and your crutch or cane in the other. If there is no rail, ask your therapist how to manage with two crutches.
- Going up: step up with your good leg first. Then bring your operated leg up to the same step. Then bring up the crutch or cane.
- Going down: put the crutch or cane down onto the step below first. Then step down with your operated leg. Then bring your good leg down to join it.
- Why this order works: going up, your strong leg does the lifting. Going down, your strong leg does the lowering. Your new knee comes along for the ride either way.
- Take your time: stand still on each step until you feel steady. Rushing is how people miss a step.
Why going down hurts more
Going down a step means your knee has to bend while it carries your whole body weight. The big muscle on the front of your thigh, the quadriceps, has to work as a brake to control that bend. After surgery this muscle is weak and slow to switch on, so the knee feels wobbly and sore on the way down.
Going down also needs a little more knee bend than going up. Roughly, going up needs about 85 to 90 degrees of bend, and going down needs a bit more. If your knee is still stiff, the bottom of each step down is where you will feel it.
Your good leg lifts you up, your good leg lowers you down, and your new knee follows.
When will stairs feel normal?
Timings vary between people and between surgeons. This is a typical pattern.
- In the hospital: you practice a few steps with a therapist, usually before you go home. Being able to manage two or three stairs is a common goal before discharge. Read more in this guide to activities after knee replacement from OrthoInfo.
- Weeks 1 to 4: one step at a time, rail plus crutch or cane. Many people limit trips upstairs by setting up most of the day on one floor.
- Weeks 4 to 6: going up starts to feel easier. Some people try a few steps foot over foot going up while still going down one at a time.
- Weeks 6 to 12: normal step-over-step stairs usually come back somewhere in this window as strength and bend return. Down is often the last part to feel natural.
- After 3 months: if stairs are still a struggle, the usual reasons are a stiff knee or a weak thigh. Both often improve with targeted work. See knee stiffness after knee replacement
How to practice
- Start with a low step: a single bottom stair or a sturdy low platform is far easier than a full flight. Master that before you add more.
- Do step-ups: stand facing the bottom stair, holding the rail. Step up with the operated leg, straighten it, then step back down. Start with 5 to 10 and build up. This trains the exact muscle stairs need. See exercises after knee replacement
- Practice slow step-downs: once your therapist agrees, stand on the bottom step and slowly lower your good foot to the floor, letting the operated knee bend under control. This is the movement that makes going down easier.
- Always use the rail: even when you feel strong. A rail costs nothing and prevents most stair falls.
- Work on balance: stairs ask you to stand on one leg for a moment every step. Simple balance drills make that moment safer. See balance exercises to prevent falls
- Keep the stairs clear and lit: no shoes, bags or laundry on the steps, and a light you can reach from top and bottom.
What’s normal
- Soreness after stairs: an ache that settles within an hour or two of rest is expected in the first weeks.
- Going down feels harder than going up: this is the usual pattern and can last for months.
- Feeling slow: one step at a time is the safe method, not a sign that something is wrong.
- Some swelling at the end of the day: common, especially on days with more stairs. Raise the leg and it should ease overnight.
Go to the emergency department if
- You fall on the stairs and cannot put weight on the leg, or the knee looks out of shape.
- You have chest pain or sudden shortness of breath.
Call your surgeon today if
- Your calf becomes swollen, tender, hot or red.
- The wound is leaking, opening, or getting more red, or you have a fever.
- You fall on the stairs, even if you can still walk afterward.
- Pain is getting steadily worse rather than better.
Mention it at your next review if
- You still cannot manage stairs one at a time after about 6 weeks.
- Your knee will not bend past about 90 degrees.
- The knee gives way or feels unstable on stairs.
Going up is about strength, but going down is about control, so train the step down and the stairs will follow.