Private partial (unicompartmental) knee replacement cost in the UK: 2026 price guide

A private partial knee replacement resurfaces only the damaged compartment of the knee, usually the inner side, leaving healthy bone and ligaments in place, and is suitable for a minority of people with arthritis confined to one area.

The range in the published self-pay lists for partial (unicompartmental) knee replacement was £15,325 to £17,750. That spread reflects different hospitals, different variants and different ideas of what belongs in a package, so the table names each one.

Lists are revised from time to time and sit alongside conditions in the small print. The figures help you see where a quote falls, but they cannot replace your own estimate.

The surgeon removes only the damaged part of the joint and fits a smaller implant, preserving the cruciate ligaments and the other compartments. The operation is usually shorter and involves less bone removal than a total knee replacement.

Surgeons choose partial replacement carefully, so ask why it is suitable for you and what the plan would be if it later wears out or arthritis progresses.

Two patients having the same operation or test can receive quite different bills. For partial (unicompartmental) knee replacement, these are the factors that most often explain the gap.

• Suitability: only people with arthritis limited to one compartment and intact ligaments qualify, so the decision is clinical before it is financial.

• Implant and approach: standard, mobile-bearing or robotic-assisted implants vary in price.

• Hospital pricing: Nuffield Health lists unicompartmental replacement at £15,550 in Bristol but £17,750 in Brighton, so location matters more than the knee type.

• Length of stay: shorter stays reduce the hospital fee, but are not guaranteed.

• Consultant and anaesthetist fees set independently of the hospital.

Ask for the inclusions in writing. For this procedure the usual split between what is covered and what is charged on top looks like this.

Insurers generally cover partial knee replacement when indicated, though some set lower fee ceilings than for a total knee. Check authorisation of both options.

Check whether your insurer recognises the exact procedure and the consultant you plan to see, and ask for any excess in writing. Self-funders can usually ask about finance, but terms depend on credit checks and should be read closely.

NHS partial knee replacement is available to selected patients after assessment, and subject to local waiting times; the 18-week standard applies to the pathway.

Many people consider private care because of NHS waiting times, but the NHS route costs nothing at the point of use and the 18-week standard applies to non-urgent consultant-led pathways. Local performance varies.

Recovery is often quicker than after a total knee replacement, with earlier walking and return to driving, though physiotherapy remains important.

The risks below are the ones that can turn a quoted price into a larger bill, so ask how each would be dealt with.

• Partial replacements have a higher chance of needing revision to a total knee than total replacements in registry data, so discuss the trade-off with your surgeon.

• Persisting pain can arise from arthritis progressing in other parts of the knee, which would mean further surgery and cost.

Write the answers down as you go. These are the questions that tend to separate similar-looking quotes for this procedure.

• Why is partial replacement suitable for my knee?

• What is the price compared with total knee replacement at the same hospital?

• What would conversion to a total knee cost if needed later?

• What aftercare is included?

• Is every fee in the quote guaranteed, or could consultant and anaesthetist charges differ from the estimate on the day?