Caring for Your New Knee Long-Term: How to Protect Your Knee Replacement
Key takeaways
- A knee replacement typically lasts 15 to 20 or more years, and around 90 to 95% are still in place at 10 years.
- Staying a healthy weight, exercising in low-impact ways, and keeping the muscles strong are the main ways to protect the joint.
- Watch for and treat infections promptly, as an implant infection affects about 1 to 2 in 100 people and is serious.
- Keep your follow-up appointments so the implant can be checked over the years, even when it feels fine.
- Knowing the warning signs of a failing implant means you act early, when problems are easiest to manage.
By Margaret Doyle | Medically reviewed by Mr Paul Henderson, FRCS (Tr&Orth)
Updated June 5, 2026 · 3 min read
Caring for your new knee long-term means staying a healthy weight, exercising in low-impact ways, keeping the muscles strong, treating infections promptly, and keeping your follow-up appointments. These habits help the implant reach its full lifespan. A knee replacement typically lasts 15 to 20 or more years, and around 90 to 95% are still in place at 10 years1.
Once the hard months of recovery were behind me, the question changed from “how do I get through this?” to “how do I keep this knee working for as long as possible?” Nobody handed me a clear list, so here is one, checked by a consultant orthopaedic surgeon. If you are still in early recovery, our knee replacement surgery guide covers the whole journey first.
Stay a healthy weight
Keeping to a healthy weight is one of the most effective ways to protect a knee replacement, because every extra kilogram adds load to the joint with each step. Excess weight wears the plastic bearing faster and is a recognised factor in earlier loosening. NICE highlights weight management as a core part of managing osteoarthritis and joint health2.
You do not need to be slim, just to avoid carrying excess load on the implant. Even a modest, sustained reduction reduces the daily force going through the joint. I found that the more I walked, the easier it became to keep my weight steady, so the two habits reinforced each other.
Exercise the right way, for life
Low-impact exercise and ongoing strength work protect the joint, while high-impact, twisting sport wears it faster. The American Academy of Orthopaedic Surgeons recommends walking, swimming, cycling, and golf, and advises against high-impact activities such as running and contact sport3.
Two habits matter most:
- Keep moving with low-impact activity: walking, cycling, and swimming maintain movement and muscle without pounding the implant.
- Keep the thigh muscles strong: strong quadriceps support and stabilise the knee. A few simple exercises a few times a week is enough once you are recovered.
For which sports are safe and when to return to each, see activities and sports after a knee replacement, and for the strengthening routine, our knee replacement exercises.
Protect against infection
A deep infection around the implant affects about 1 to 2 in 100 people, is serious, and can need further surgery, so treating infections anywhere in the body promptly matters for life. Bacteria can occasionally travel through the bloodstream and settle on an implant4.
In practice this means: treat skin infections, urine infections, and dental problems promptly; keep your teeth and gums healthy; and tell any doctor or dentist that you have a joint replacement. Routine antibiotics before dental work are not recommended for most people now, but follow your own surgeon’s and dentist’s advice. Report a hot, swollen, increasingly painful knee, or fever, urgently. The signs are covered in detail in signs your knee replacement is failing.
Keep your follow-up appointments
Keep the follow-up reviews your surgeon arranges, even when the knee feels fine, because they can spot quiet wear or loosening before it causes symptoms. Many people are seen at intervals over the years, sometimes with an X-ray. The National Joint Registry tracks implants over time precisely because problems can develop slowly and silently1.
Between appointments, report any new pain, swelling, instability, or clicking rather than waiting. Catching a problem early usually means a simpler solution. Some weather-change aching is part of the honest reality, as about 1 in 5 people feel the knee is never quite normal4, but a clear change deserves a check. For how to tell the difference, read signs your knee replacement is failing.
What good long-term care looks like in practice
Day to day, long-term care is mostly ordinary good habits kept up consistently rather than anything dramatic. You will have used walking aids for 2 to 6 weeks and resumed driving around 6 weeks during recovery5; the long-term phase is simply protecting that hard-won result.
A simple checklist:
- Keep to a healthy weight.
- Walk, cycle, or swim regularly; avoid high-impact sport.
- Do a little strength work each week.
- Treat infections promptly and keep your teeth healthy.
- Attend follow-up reviews and report new symptoms early.
For the figures behind implant lifespan, see how long a knee replacement lasts.
References
- How long does a knee replacement last?, National Joint Registry. ↩
- Osteoarthritis in over 16s: diagnosis and management (NG226), NICE. ↩
- Activities After Knee Replacement (OrthoInfo), American Academy of Orthopaedic Surgeons. ↩
- Total Knee Replacement (OrthoInfo), American Academy of Orthopaedic Surgeons. ↩
- Knee replacement: Recovery, NHS. ↩
Common questions
How long will my knee replacement last?
A modern knee replacement typically lasts 15 to 20 or more years, and registry data shows around 90 to 95% are still in place at 10 years. How long yours lasts depends partly on your age, weight, and activity level: high-impact loading and excess weight wear the plastic bearing faster. Looking after the joint with low-impact exercise and a healthy weight helps it reach the upper end of that range.
Do I need antibiotics before dental work after a knee replacement?
Routine antibiotics before dental work are not recommended for most people with a knee replacement under current guidance, but practice varies and your surgeon or dentist may advise them in specific cases. The more important habit is keeping your teeth and gums healthy and treating any infection promptly, because infection anywhere in the body can occasionally seed to an implant. Always follow the advice of your own surgical and dental team.
Can I damage my knee replacement?
Yes, though it is uncommon with sensible use. High-impact sport and being significantly overweight wear the implant faster, a heavy fall can fracture the bone around it, and a deep infection can damage it. Following low-impact activity advice, staying a healthy weight, and treating infections quickly are the main ways to protect it. An infection around the implant affects about 1 to 2 in 100 people and is serious.
How often should I have my knee replacement checked?
Follow-up varies by surgeon and country, but many people are seen at intervals over the years, sometimes with an X-ray, even when the knee feels fine. These checks can spot quiet wear or loosening before it causes symptoms. Keep your appointments and report new pain, swelling, or instability between them rather than waiting for the next scheduled review.
Do I need to keep doing my exercises after recovery?
Yes. Keeping the muscles around the knee strong, especially the thigh muscles, supports the joint for the long term and helps maintain the range of movement you worked hard to regain. You do not need formal physiotherapy forever, but regular low-impact exercise such as walking, cycling, or swimming, plus simple strengthening, protects the result. Stopping all activity tends to let stiffness and weakness creep back.
Will the weather affect my new knee?
Some people notice an aching, weather-change sensation in the replaced knee, particularly in cold or damp conditions. This is part of the honest reality that about 1 in 5 people feel the knee is never quite normal, with some stiffness or aching that comes and goes. It is usually mild and not a sign anything is wrong, though persistent or worsening pain should always be checked.
Written by Margaret Doyle. Medically reviewed by Mr Paul Henderson, FRCS (Tr&Orth).
Our guides are written from personal experience and reviewed by a qualified clinician for accuracy. Read our editorial policy.