Eight out of 10 knee replacements and six out of 10 hip replacements last as long as 25 years, says a large study from the University of Bristol.
This is much longer than believed, the researchers said, and the findings will help patients and surgeons decide when to carry out surgery.
To date, there has been little data on the success of new hips and knees.
But this Lancet research looked at 25 years' worth of operations, involving more than 500,000 people.
Hip and knee replacements are two of the most common forms of surgery in the NHS, but doctors often struggle to answer questions from patients on how long the implants will last.
'May last even longer'
Nearly 200,000 of the operations were performed in 2017 in England and Wales, with most carried out on people between 60 and 80 years old.
Dr Jonathan Evans, orthopaedic registrar, lead study author and research fellow at Bristol Medical School, said: "At best, the NHS has only been able to say how long replacements are designed to last, rather than referring to actual evidence from multiple patients' experiences of joint replacement surgery.
"Given the improvement in technology and techniques in the last 25 years, we expect that hip or knee replacements put in today may last even longer."
As the ageing population grows, and life expectancy rises, this becomes even more important, Dr Evans added.
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Wendy Fryer, 80, had a hip replacement 17 years ago and it has completely changed her life.
"I was in agony beforehand, It was horrendous," she said.
"I used to cycle to work but had to stop. But the very next day after the operation, it was like magic, the pain had gone."
She still plays table tennis and badminton regularly, and also enjoys cycling and walking.
"The worst thing you can do is become a couch potato," Wendy says.Image copyright University of Bristol
How long do they last?
Hip replacements: 89% lasted 15 years, 70% lasted 20 years, 58% lasted 25 years
Total knee replacements: 93% lasted 15 years, 90% lasted 20 years, 82% lasted 25 years
Partial knee replacements: 77% lasted 15 years, 72% lasted 20 years, 70% lasted 25 years
The researchers, writing in the Lancet, looked at reports from joint replacement registries in six countries which held at least 15 years of data - Australia, Finland, Denmark, New Zealand, Norway and Sweden.
They did not look at data from the UK, because its record of patients does not go back far enough, but the research team said their findings mirrored results from smaller studies of UK patients.
According to the study, when hip and knee replacements do fail it tends to be because of infection, wear and tear and, more rarely, because they have broken.
This means patients require revision surgery which is more likely to fail.
Most hip and fast or Slow, Weight Loss Has Similar Effect on Health knee replacements last longer than thought - BBC News
Most had osteoarthritis, were female and had their operation when they were 63 years old on average. Sometimes the pain is worse with deep squatting or twisting. Broadly speaking there are two types of knee replacements: Both have long track records and good clinical results in interpersonal Medicine Already Exists this country and in Europe. Patients who prefer not to have inpatient rehabilitation may spend an extra day or two in the hospital before discharge to home. Arthritis patients who develop such infections would notice a significant worsening in their pain as well as some of the other symptoms listed above. Watch a Video: Minimally-Invasive Joint Replacement Total Knee replacement video In the video below, orthopedic surgeon. Treatment for...too Much TV Raises Women’s Odds for Early-Onset Colon Cancer: Study
If you can, continue to take gentle exercise, such as walking and swimming, in the weeks and months before your operation. Recovering from knee replacement surgery You'll usually be in hospital for three to five days, but recovery times can vary depending on the individual and type of surgery being carried out. For these reasons, some surgeons advise younger patients to put off surgery as long as possible, even if that means suffering with pain, stiffness, and reduced mobility. You may be offered knee replacement surgery if: you have severe pain, swelling and stiffness in your knee joint and your mobility is reduced your knee pain is so severe that it interferes with your quality of life. Regular range of motion exercises and weight bearing activity are important in maintaining primary Care Docs Ambivalent About Cancer Decisions muscle strength and overall aerobic (heart and lung) capacity.