Treatment
A total knee replacement is one of the most reliably life-changing operations in medicine — and one of the most misunderstood. It does not remove your knee; it resurfaces it, capping worn bone ends with metal and a smooth bearing so that walking stops hurting. Robotic knee replacement adds precision to that work, planning the operation on a model of your own knee and holding the execution to fine margins. This page covers what it genuinely delivers, what it asks of you afterwards, and how to judge when the time has come.
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The worn surfaces at the end of the thigh bone and the top of the shin bone are reshaped and capped with precisely fitted metal components; a durable plastic bearing sits between them to do the gliding that cartilage used to do; the back of the kneecap is resurfaced where it needs it. The ligaments at the sides of the knee are preserved and balanced so the joint feels stable through its range — balancing is as important to the result as the implants themselves. The bone actually removed is a matter of millimetres. What ends is the bone-on-bone grinding that has been organising your life; what begins is a rehabilitation programme that turns a new joint into a working knee.
How long a knee replacement keeps working
Figures reflect national joint registry data and published series — our specialist will discuss what applies to your age, weight and activity.
Everyone arrives with one question louder than the others. Tap yours — the straight answer is one scroll away.
For most people, the great majority of it — this operation exists because it works. The arthritis pain that wakes you at night and shortens every walk is usually gone or dramatically reduced, and the improvement holds for years. Two honest qualifications belong beside that. First, a minority of patients — roughly one in five in large studies — report that their knee never feels entirely right, whether through residual aching, stiffness, or a joint that simply feels more mechanical than the one they were born with. Second, a replaced knee is not a young knee: it delivers comfortable walking, stairs, cycling, swimming and travel, not running and jumping. What it reliably gives back is the ordinary life that arthritis had been quietly editing — sleep, distance, independence, the ability to say yes to things.
On the robot, honestly. Robotic knee replacement plans the operation on a three-dimensional model of your knee, then assists the surgeon in executing that plan to within very fine margins, with real-time feedback on alignment, balance and soft-tissue tension. The surgeon makes every decision — the system does not operate on anyone. The evidence is consistent that positioning is more accurate and extreme outliers are rarer; some studies also report less early pain and quicker early recovery. What has not yet been demonstrated is that this makes implants last longer, and anyone who tells you otherwise is ahead of the data. Precision is worth having, and it is not a substitute for judgement about which knee needs which operation.
On the risks. The common and temporary: swelling, stiffness and bruising over weeks. The uncommon: blood clots in the leg or lung — which is why you are walking the same day — infection, wound healing problems, stiffness needing extra treatment, and numbness in a patch of skin beside the scar, which is near-universal to some degree and usually shrinks. The serious and rare: deep infection requiring further surgery, fracture around the implant, or persistent unexplained pain. Your own risks shift with weight, diabetes, smoking and general health — all discussed, with numbers, before anything is booked.
Faster at the start than most people fear, and slower at the end than most people expect. Standing and walking happen within a day; home follows in two to four; walking aids are usually gone by four to six weeks, which is also when driving typically returns. Everyday comfort arrives around three months — and the knee keeps quietly improving for a full year, which is worth knowing so month five doesn’t feel like failure. The exercises are the operation’s other half: the implant supplies the joint, the rehabilitation supplies the knee. Wherever you are:
Come and get the picture straight before deciding. A consultation examines the knee, reads the wear across all three compartments, and lays out every option honestly — including whether a partial replacement or realignment would serve you better, and whether non-surgical treatment still has room to run.
Prehabilitation earns its keep here. Stronger thighs before surgery mean a faster, more comfortable recovery afterwards — the evidence is consistent. Optimise weight and any medical conditions, stop smoking if you can, and set your home up for the first fortnight: clear floors, a firm chair, help on hand.
Bend it, straighten it, walk it — every single day. Early range of motion is the one thing that cannot be recovered later if lost. Expect swelling that comes and goes for months, and keep going through the plateau at six to eight weeks. Report calf pain, fever, or a wound that looks angry without delay.
Registry data is reassuring: roughly nine in ten knee replacements are still working fifteen years on, and many run well past twenty. What shortens that: being young at the time of surgery (more years of use), higher body weight, high-impact activity, and implants positioned outside their intended alignment — the last of which is precisely where planning and robotic precision earn their place. What wears out is usually the plastic bearing, or the bond between implant and bone loosening over time; both announce themselves gradually with returning pain rather than suddenly. If revision becomes necessary, it is a bigger, more specialised operation than the original — done well, but genuinely more complex — which is the honest reason we do not rush a young knee into a replacement when an osteotomy or a partial could carry it through another decade first.
The knee decides this, not the X-ray and not your age. Replacement earns its place when arthritis has stopped answering to everything reasonable and started shrinking your life. Check your picture:
That is the picture replacement was designed for. The next step is a consultation, not a booking: confirming the wear pattern, checking whether a partial or realignment would suit you better, and setting out honestly what the operation and its rehabilitation would ask of you.
Good news — your knee may still have room to improve without surgery. Arthritis that hasn’t yet taken your sleep or your distances often responds well to structured strengthening and load management. An assessment builds that plan and tells you honestly what it can and cannot achieve.
And remember: a consultation is for finding the right answer — which is sometimes a smaller operation, and sometimes none.
Tap the one that sounds like you — and get the straight answer:
A total knee replacement resurfaces the whole joint. The worn ends of the thigh bone and shin bone are reshaped and capped with metal components, with a smooth plastic bearing between them, and the back of the kneecap is resurfaced where needed. The bone removed is thinner than most people imagine — this is resurfacing rather than removal — and the aim is straightforward: take away arthritis pain and give back a knee you can walk, work and live on.
Robotic knee replacement means the operation is planned on a three-dimensional model of your own knee and carried out with robotic assistance that holds the surgeon to that plan within very fine margins. The surgeon makes every decision; the system improves the precision of executing them and helps protect surrounding soft tissue. Published work consistently shows more accurate implant positioning and fewer outliers. Whether that translates into implants lasting longer is still being studied honestly.
Most patients stand and walk within a day of surgery, go home within two to four days, and walk without aids by around four to six weeks. Driving usually returns at four to six weeks, and comfortable everyday function at about three months. Swelling and stiffness settle gradually, and the knee typically continues improving for a full year. Rehabilitation is not optional — the operation supplies the joint, and the exercises supply the result.
Around nine in ten are still functioning well fifteen years after surgery, and a substantial proportion reach twenty years and beyond. Longevity depends on age, weight, activity level and how accurately the implant was positioned. Heavy impact activity shortens implant life, which is why running and jumping sports are discouraged afterwards — the knee is built for a full, active life, not for pounding.
When arthritis pain and lost function persist despite genuine non-surgical treatment, and your life has quietly contracted around the knee — sleep disturbed, walking distance shrinking, activities abandoned. Waiting until the knee is severely deformed and the muscles have wasted makes recovery harder and results less complete, so “last possible moment” is not the goal. Neither is operating early on a knee that still responds to strengthening and load management.
Related: Knee osteoarthritis · Partial knee replacement · Knee osteotomy · Knee surgery
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