How Long Does a Joint Replacement Last in Australia? What 20 Years of Registry Data Shows

Key Takeaways

• Registry data to the end of 2024 shows most modern hips and knees are still in place at 10, 15 and 20 years, with revision rates reported as a range.
• Age at surgery has the strongest link to longevity, with younger patients recorded as having higher 20-year revision rates.
• Weight, general health, the reason for surgery and the implant used all shift the numbers.
• Strength work beforehand, structured rehabilitation and early reporting of new pain are the parts you influence.

Getting a new hip or knee comes with one question that sits at the back of your mind. How long does a joint replacement last in Australia, and will it carry you through the years you want to spend walking the dog, gardening, travelling and keeping up with the grandkids?

Australia is an unusually good place to ask. Since 1999, the Australian Orthopaedic Association National Joint Replacement Registry (AOANJRR) has recorded almost every hip and knee replacement performed in the country. Its most recent report analysed more than 2.1 million hip and knee procedures recorded to 31 December 2024. Anyone weighing up surgery with a knee replacement surgeon can look at what has actually happened to hundreds of thousands of people before them.

Those figures describe large groups, not individuals. Your age, your joint, your general health and your goals will always matter more to your own result than a national average.

What the Australian Joint Registry Actually Measures

The headline numbers make more sense once you know what the Registry counts and what it leaves out:

Counting Almost Every Hip and Knee in Australia

The Registry began in 1999 and became fully national in mid 2002. It now receives information from more than 300 hospitals and is funded by the Australian Government Department of Health, Disability and Ageing. Its most recent reporting covers 972,256 hip procedures and 1,205,616 knee procedures. In 2024 alone, 60,414 hip replacements and 79,331 knee replacements were recorded.

Because participation is close to universal, the figures reflect what happens across the country, in public and private hospitals, in straightforward cases and complicated ones.

Measuring Longevity Through Revision Rates

The main measure the Registry publishes is a revision rate it labels ‘cumulative percent revision’. Of everyone who had this operation and is still alive at a given point, it shows what share has needed the joint redone.

A revision is a second operation to replace or adjust part of the original joint replacement. When the AOANJRR reports a revision rate of 5% at 10 years for a particular hip, the other 95% of those hips are still doing their job.

Separating Revision From Failure

Not every revision means the joint stopped working. Some swap a single plastic insert. Others deal with infection, a fall that fractured bone around the implant, or an instability problem that was never about wear.

Equally, a joint can feel a little stiff or occasionally sore and never be revised at all. Revision rates track surgery, not satisfaction, which is why the Registry also collects patient-reported outcome measures (PROMs) directly from people before and six months after their operation.

Reading a National Average With Care

Every published figure is an estimate with a confidence range around it, and a slightly higher number in one group does not always mean a real difference.

The Registry also restricts most analysis to ‘modern prostheses’, meaning devices still in use in 2024. Older designs that performed poorly and have since been withdrawn are left out, so the published numbers describe what is being implanted now.

How Long Hips and Knees Last in the Registry Data

Long-term results are reported for prosthesis combinations with enough follow-up to be meaningful, grouped by how many years of data exist:

10-Year Outcomes for Hips and Knees

The Registry’s 2025 Annual Report covers 10-year results for 45 modern hip prosthesis combinations, together accounting for 79.9% of primary total conventional hip procedures in Australia. Revision rates across those combinations range from 2.5% to 8.0%.

For knees, 37 modern total knee combinations have a decade or more of data, covering 89.2% of total knee procedures, with revision rates from 2.8% to 9.2%. More than nine in 10 of these knees were still in place 10 years after surgery.

15-Year Outcomes for Hips and Knees

Follow-up out to 15 years exists for 26 hip combinations and 19 knee combinations. Hip revision rates at that point range from 4.4% to 17.8%, and knee revision rates from 4.0% to 11.4%. The spread widens with time. More years mean more wear, more falls, more chance of infection and the ordinary effects of ageing bone.

20-Year Outcomes for Hips and Knees

Results out to 20 years are now available for 12 hip combinations, used in 30.7% of primary total conventional hip replacements performed for osteoarthritis, with revision rates from 5.4% to 16.3%.

Knee combinations with two decades of data were used in 14.6% of primary total knee replacements for osteoarthritis, and their revision rates range from 7.3% to 14.0%. Most people who had a hip or knee replaced 20 years ago have never needed a second operation on that joint.

Follow-Up Period	Total Hip Revision Rate	Total Knee Revision Rate
10 years	2.5% to 8.0%	2.8% to 9.2%
15 years	4.4% to 17.8%	4.0% to 11.4%
20 years	5.4% to 16.3%	7.3% to 14.0%

These ranges are a general guide drawn from the most recent Registry reporting on modern prosthesis combinations. Individual results vary with age, general health, diagnosis and the device used.

Long-Term Outcomes for Partial Knees

Partial, or unicompartmental, knee replacement resurfaces only one side of the knee and makes up 7% of knee replacements recorded since the Registry began. It carries a higher revision rate than total knee replacement. At 20 years, 26.7% of unicompartmental knees had been revised, rising to 39.1% among people under 55 at the time of surgery.

That does not make it a poor choice. Partial knees suit a specific pattern of arthritis, preserve more bone, often feel more natural and can be converted to a total knee later. The trade-off is worth discussing with your surgeon.

Patient Factors That Influence How Long a Joint Replacement Lasts

The Registry compares outcomes across patient groups, and a few patterns show up year after year:

Your Age at Surgery

Age is the patient factor most consistently tied to longevity. The younger you are at surgery, the higher the long-term revision rate. People under 55 at the time of a total knee replacement have a 15.8% chance of revision by 20 years, and that figure falls as age at surgery rises. A joint implanted at 50 has to survive more decades and more load than one implanted at 75.

That is why timing gets discussed carefully. Your age is worth raising directly with your surgeon, since what it means for your own likely result depends on the joint, the implant and your general health.

Your Reason for Surgery

People having a hip or knee replaced for osteoarthritis tend to record better long-term results than those having it for another reason. Replacements done after a fracture, for inflammatory arthritis or for a significant deformity often involve more difficult bone and soft tissue, and higher revision rates follow.

Your General Health and Weight

The Registry tracks a general health grade recorded by the anaesthetic team, along with body mass index (BMI). Higher scores on either are associated with higher revision rates, and infection accounts for much of that difference.

Parts of that are modifiable. Weight, blood sugar and smoking are all areas where a care team can help you prepare.

Your Sex and the Joint Involved

Patterns differ by joint. In hip replacement, women have a slightly lower risk of revision than men. In knee replacement it runs the other way, with men recorded as having a slightly higher revision rate.

These differences are small next to the effect of age, and neither changes whether surgery is worth having.

Implant, Fixation and Technique Factors Recorded by the Registry

The Registry also tracks what was implanted and how it was done, and several of those choices show measurable effects:

Fixation Method and Patient Age

Components can be fixed to bone with cement, without cement, or in a hybrid combination. Across modern hip prostheses there is now little overall difference, with one exception. For patients aged 75 and over, hybrid or cemented fixation is associated with a lower revision rate.

In knees, hybrid fixation records the smallest revision rate, though the margin is slight. Cemented fixation generally outperforms cementless, and the pattern shifts depending on the type of knee prosthesis used.

Bearing Surface and Wear Resistance

The bearing surface is where the artificial ball and socket, or the metal and plastic of a knee, move against each other. Cross-linked polyethylene (XLPE) has almost entirely replaced older non-cross-linked plastic in hips, and the Registry links it to fewer revisions for dislocation, loosening and bone loss around the implant.

Some of that benefit comes from larger femoral head sizes, which XLPE makes possible because it resists wear so well. A larger head sits more securely in the socket and dislocates less often.

Surgical Approach and Reasons for Revision

Hip replacement can be performed through a posterior, lateral or anterior approach. The Registry records a higher overall revision rate for the lateral and posterior approaches compared with the anterior approach, though the reasons differ between them. The anterior approach has more revisions for loosening and early fracture, and fewer for infection and dislocation.

No single approach wins outright. The choice between an anterior or posterior approach comes down to your anatomy, your diagnosis and your surgeon’s own experience.

Technology-Assisted Surgery and Revision Rates

Robotic assistance in knee replacement has grown quickly. Registry data shows no difference in revision rates compared with surgery done without technology assistance, regardless of age or other factors. The same applies to computer navigation.

Image-derived instrumentation, where custom guides are made from pre-operative scans, is associated with a higher revision rate in knees. A marketing claim about a technique is not the same as long-term Registry data.

Prosthesis Monitoring and Outlier Identification

Each year the Registry identifies individual prostheses whose revision rate is more than twice that of others in the same class, where the difference is statistically significant. In the most recent report, several hip and knee devices were among those identified for the first time.

Devices that underperform are flagged publicly, the Therapeutic Goods Administration (TGA) monitors implant safety on the back of that data, and many have since been withdrawn from markets here and overseas.

Why Joint Replacements Need Revision in Australia

Revision surgery is more involved than a first replacement, and the reasons behind it are worth knowing:

Reasons for Hip Revision

The most frequent reasons for a first hip revision are loosening, instability or dislocation, and fracture around the implant. Registry analysis shows cementless fixation reduces the chance of a further revision when the femoral component is redone for loosening, and dual-mobility bearings lower the risk of later dislocation when the first revision was for instability.

Reasons for Knee Revision

For knees, the common indications are instability or dislocation, loosening and infection. The share of first revisions done for loosening has fallen over time. Where the revision is for loosening, fixation-supporting devices such as metaphyseal sleeves, cones and stem extensions are associated with a lower rate of further revision.

Drivers of Australia’s Falling Revision Burden

Revision burden is the share of all procedures in a year that are revisions. For hips it fell to 6.7% in 2024, the smallest figure the Registry has recorded. For knees it fell to 6.9%, down from 8.8% in 2004.

Better implant selection, refined technique and public reporting of results have steadily reduced the number of Australians needing a redo.

How to Support the Longevity of Your Hip or Knee

Registry data records what has already happened. Several everyday habits shape what happens from here:

Building Strength Before Surgery

Muscle you take into theatre is muscle you get back sooner. Quadriceps, glute and core strength support the joint once it is in place and reduce the load falling on the implant itself. Starting that work weeks before the date, not days, is what makes the difference.

Following Your Rehabilitation Plan

Rehabilitation is where range of movement, walking pattern and confidence get rebuilt, and the first six weeks do most of that work. Stopping once the pain settles tends to leave weakness and an altered gait behind, and both place uneven load on the new joint for years afterwards.

Protecting the Joint Against Infection

Bacteria can travel through the bloodstream and settle on an implant, which is why infection features so heavily in revision statistics. Keeping teeth and gums healthy, treating skin and urinary infections promptly, and telling any treating clinician that you have a joint replacement all help reduce that risk.

Some people are advised to take antibiotics before certain dental or surgical procedures. That decision belongs with your surgeon and your general practitioner (GP).

Choosing Activities That Suit a Replaced Joint

Walking, swimming, cycling, golf, bowls and gym work with sensible loads are widely encouraged. Repetitive high-impact activity such as running on hard surfaces or contact sport places more demand on the bearing and the fixation, and your surgeon may suggest limits based on your implant, your age and your bone quality.

Reporting New Symptoms Early

Problems caught early are usually smaller problems. Contact your surgeon or GP promptly about:

• New or worsening joint pain after a settled period
• Swelling, redness or heat around the surgical area
• Fever or feeling unwell without an obvious cause
• New grinding, clicking or clunking in the joint
• Instability or catching in the joint
• Difficulty bearing weight that was not there before
• Wound breakdown or discharge from the surgical site

This list is a general guide, not a diagnostic tool. Symptoms vary between people, and a medical assessment is the way to know what is happening inside your joint.

Keeping Up With Review Appointments

Many surgeons review joint replacements periodically, often with an X-ray, to check implant position and the bone around it. These reviews can pick up wear or early loosening before it causes symptoms, which usually means a simpler procedure if something does need attention.

Planning the Next 20 Years, Not the Next Operation

Most people asking this question are bracing for a second operation that, on the 20-year data, they may never need. The years in between are the part worth planning for.

Your own result will never be the national average. It will be shaped by the joint you have, the implant your surgeon chooses, the health you take into theatre and the work you put in afterwards. The last two are yours.

The team at MTP Health can talk through what these outcomes may mean for your circumstances and support you before surgery and through recovery. Where joint pain is changing how you live, your GP or a specialist is the right next step.

Frequently Asked Questions (FAQs)

1. How long does a hip replacement last in Australia?

Registry reporting shows revision rates for modern hip combinations ranging from 2.5% to 8.0% at 10 years, 4.4% to 17.8% at 15 years and 5.4% to 16.3% at 20 years. Most people who had a hip replaced two decades ago still have that original joint.

2. Do knee replacements last as long as hip replacements?

The long-term ranges are broadly comparable. Differences between individual prosthesis combinations are often larger than the difference between hips and knees, so the device used and your age at surgery matter more than which joint is being replaced.

3. Am I too young for a joint replacement?

Age is a factor in longevity, not a barrier to surgery. Younger patients do face higher revision rates over 20 years, so surgeons weigh how much pain and loss of function you are living with now against the likelihood of needing a further operation later. That conversation is worth having.

4. Does a partial knee replacement need replacing sooner?

On average, yes, and age drives most of the gap. Registry data records 26.7% of unicompartmental knees revised by 20 years, rising to 39.1% for people under 55 at surgery. Converting to a total knee later remains an option.

5. Will robotic surgery make my joint last longer?

Current Registry data does not show a difference in revision rates for robotic assistance or computer navigation compared with knee replacement performed without technology assistance. That may change as longer follow-up accumulates, though the evidence today does not support choosing surgery on that basis alone.

6. What actually happens in a revision operation?

It depends entirely on the problem. Some revisions exchange a single plastic insert. Others replace the whole implant, sometimes with longer stems, sleeves or cones to restore fixation where bone has been lost. Recovery is usually slower than after a first replacement.

7. Can I still run or play sport afterwards?

Many people return to low-impact sport. Running and contact sport are the usual points of discussion, so ask your surgeon specifically about the activities that matter to you.

8. How would I know if my joint replacement is wearing out?

Common signs include pain returning after a settled period, new grinding or clicking, swelling or a sense of instability. These can also have simpler explanations such as muscle weakness or tendon irritation, so an assessment with a physiotherapist or surgeon is the way to find out which it is.

Disclaimer: This article provides general information only and does not take account of your personal circumstances, medical history or goals. It is not a substitute for individual medical advice. Speak with a qualified health professional, such as your general practitioner, physiotherapist or orthopaedic surgeon, before making decisions about joint pain, surgery or rehabilitation.