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By Mr Oni MBChB BSC PGDip FRCS (Tr &Orth), Consultant Hip and Knee Surgeon
Written: August 19th, 2026
A knee replacement is only half the story. The operation creates the potential for a comfortable, working knee, but the recovery is where that potential is realised or wasted. After many years of seeing patients through this journey, the same handful of mistakes come up again and again. None of them come from carelessness. Most come from doing what feels sensible at the time. Here are the ones I would most like you to avoid.
The most natural instinct after surgery is to protect the knee by keeping it still. It is also the most damaging one. Protecting the knee by keeping it still is exactly what leaves it stiff, and stiffness gained early is hard to win back later. The knee needs to move from the start, little and often, even when it feels like it needs to be still.
Everyone fixates on how far the knee bends. Fewer people think about how straight it goes, yet getting the knee fully straight matters more in the early weeks. Resting with a pillow under the knee feels kind but stores up problems, because the knee learns to sit slightly bent. Keep it straight when you rest, and save the pillow for under the heel.
Somewhere in the second or third week, most people have their first genuinely good day. It is a trap. A good day tempts people into too much, and they pay for it with a swollen, sore knee the next day, which then costs them two or three days of progress. Steady beats spectacular at this stage. Build up gradually rather than in leaps.
Swelling is not just a cosmetic nuisance. A swollen knee bends less, hurts more and works less well. It needs to be managed rather than tolerated, with elevation, ice and sensible pacing. If your knee balloons after activity, that is your knee telling you about yesterday, and it is worth listening.
Many patients wait until the pain is bad before taking anything, usually out of an understandable wish to take as little as possible. But pain relief works far better taken ahead of the exercises than chasing pain that has already taken hold. Time it so the work can actually be done. The exercises are the recovery; the tablets exist to make them possible.
At some point, often around the two to three month mark, walking starts to feel normal and the exercises quietly stop. This is a shame, because a knee replacement keeps improving for up to a year, but only if it keeps being worked. The patients with the best knees at one year are almost always the ones who kept going after things felt fine.
Driving needs a knee that can bend comfortably and, more importantly, perform an emergency stop without hesitation. For most people that is around six weeks. Going back sooner risks more than the knee, since your insurer may not cover you if you cannot demonstrate you were safe to drive. When in doubt, wait, and check with your insurance company before you restart.
Every clinic has a story about someone who was walking the dog at three weeks. Comparing yourself with them, or with the neighbour whose recovery was slower, is rarely useful. Recovery speeds vary a lot, and the comparison tends to cause either panic or overexertion. The only comparison that matters is your knee this week against your knee last week.
Move early and often, guard your straight leg, respect the good days, manage the swelling, time your pain relief, and keep working the knee long after it stops complaining. Do those things and you give the operation every chance of delivering the knee you had it for.
If you are considering knee replacement, or you are recovering from one and something does not feel right, you can book a consultation at one of my clinics in Kent and East Sussex. Read more about knee recovery in our patient guides.