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Partial vs Total Knee Replacement: What the Evidence Says
If only one part of your knee is worn out, you may be offered a partial knee replacement instead of a total one. A major UK trial has now followed both groups for ten years, so this is one of the few decisions in orthopaedics with solid long-term evidence behind it.
Key facts
- The Oxford TOPKAT trial followed both operations for 10 years (published in The Lancet Rheumatology, 2025): Oxford Knee Scores, reoperations and revisions were similar.
- Complications were 22% after partial knee replacement versus 27% after total knee replacement; partial was also cheaper by roughly £730 on average.
- A partial knee replacement is only an option when damage is confined to one compartment of the knee — the surgeon decides after examination and imaging.
- Recovery is usually shorter after a partial knee: the NHS advises driving after three weeks, against at least six weeks for a total knee.
- In UK private pricing a partial knee is not reliably cheaper than a total knee; at the partner hospital in Poland it costs about €1,050 less (€7,570 against €8,620).
Checked 12 September 2026
What the two operations are
The knee has three compartments. A total knee replacement replaces the whole joint surface; a partial (unicompartmental) knee replacement replaces only the damaged part.
A partial knee is only an option when the damage is confined to one compartment and the knee is otherwise stable. That is a decision for your surgeon after examining you and reviewing your scans — not a choice you make from a price list.
What the 10-year trial found
TOPKAT, run by the University of Oxford, randomly assigned patients to a partial or a total knee replacement and followed them for ten years. The final results were published in The Lancet Rheumatology in 2025.
| Measure at 10 years | Partial (PKR) | Total (TKR) |
|---|---|---|
| Oxford Knee Score | Similar in both groups | Similar in both groups |
| Reoperations and revisions | Similar | Similar |
| Complications | 22% | 27% |
| Costs | Lower (by roughly £730 on average) | Higher |
| Quality-adjusted life-years | Slightly higher | Slightly lower |
Both operations worked well: knee scores roughly doubled from the starting point within months and stayed there for ten years. The differences that did appear favoured the partial knee — fewer complications and better value — but they were modest.
Two caveats from the researchers: surgeons in the trial were experienced in the operation they performed, which may not reflect every hospital, and implants have moved on since the trial began.
Recovery: the practical difference
The NHS notes that recovery from a partial knee replacement is usually shorter than from a total knee replacement. The clearest example is driving: the advice is to wait at least six weeks after a total knee replacement, but three weeks after a partial.
For everything else — exercises, walking aids, swelling, return to work — see our knee replacement recovery guide.
What each costs
| UK private | Partner hospital, Poland | |
|---|---|---|
| Total knee replacement | £11,195 – £19,740 | from €8,620 (≈ £7,420) |
| Partial knee replacement | £12,310 – £14,848 | from €7,570 (≈ £6,520) |
Note what that UK range shows: privately in the UK, a partial knee is not reliably cheaper than a total knee. At our partner hospital the partial is about €1,050 less.
UK figures: LaingBuisson self-pay data (May 2025). Poland: our partner hospital's price list (July 2026) at €1 = £0.86.
Full breakdown of the UK side, including what each package covers: private knee replacement cost.
Questions for your surgeon
- Which compartments of my knee are damaged?
- Am I a candidate for a partial knee replacement — and if not, why not?
- How many of each operation do you perform in a year?
- What happens if a partial knee needs converting to a total one later?
- Which implant would you use, and why?
Frequently asked questions
Is a partial knee replacement better than a total knee replacement?
Neither is better in general. In the 10-year TOPKAT trial, knee scores, reoperations and revisions were similar, while the partial knee had slightly fewer complications and lower costs. But a partial knee is only suitable when damage is limited to one compartment.
Does a partial knee replacement wear out sooner?
Historically, partial knee replacements have had higher long-term revision rates, partly because the threshold for revising them is lower — converting a partial to a total knee is a simpler operation than revising a total knee. In the TOPKAT trial, reoperation and revision rates at ten years were similar between the two.
Is recovery quicker after a partial knee replacement?
Usually, yes. The NHS advises you can drive three weeks after a partial knee replacement compared with at least six weeks after a total knee replacement, and recovery overall tends to be shorter.
Sources
- TOPKAT: 10-year follow-up of total versus partial knee replacement (Lancet Rheumatology, 2025) — The Lancet Rheumatology
- Partial knee replacement 'could be first choice' for suitable patients with osteoarthritis — NIHR Evidence
- Recovering from a knee replacement — NHS
- Private knee replacement costs (LaingBuisson data, May 2025) — GoPrivate.com / LaingBuisson
This article is for information only and is not medical advice. Always discuss treatment options with your GP or a specialist.
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