Surgery
Knee Replacement
A knee replacement is an operation to replace a worn knee joint with an artificial one, usually to relieve the pain and stiffness of severe arthritis.
Quick answer
Knee Replacement: what it is, why it's done and what happens
A knee replacement resurfaces the worn ends of the bones in the knee with metal and plastic components; it can replace all or part of the joint.
- Why it is done: It is used for severe knee arthritis when pain and reduced movement seriously affect daily life and other treatments no longer control symptoms.
- What happens: Under anaesthetic, the surgeon removes the damaged joint surfaces and fits the new components.
What it is
A knee replacement resurfaces the worn ends of the bones in the knee with metal and plastic components; it can replace all or part of the joint.
Why it is done
It is used for severe knee arthritis when pain and reduced movement seriously affect daily life and other treatments no longer control symptoms.
What happens
Under anaesthetic, the surgeon removes the damaged joint surfaces and fits the new components. It usually takes 1–2 hours.
Recovery
People usually start moving the knee and walking with support within a day, go home within a few days, and regain function over weeks to months, with physiotherapy central to recovery.
Good to know
Risks and things to consider
Knee replacement is generally safe and effective, but carries the usual surgical risks (infection, clots) and some people have ongoing stiffness. Rehabilitation effort strongly influences the result.
Education and reference only. This explains the procedure in general terms and is not medical advice. Your own care, risks and recovery will be explained by the team looking after you.
Answers
Knee Replacement: frequently asked questions
How long does recovery from a knee replacement take?
Many people return to most activities within about 6–12 weeks, though full recovery and strength can take several months. Physiotherapy is key.
Related
Other surgery
Sources
Where this is drawn from
- NHS — Tests and treatments
- NICE — procedure and treatment guidance
- Relevant Royal College / professional body
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