Susan Marks, a 59-year-old teacher from Wales, had reached the end of her tether.
Seven years earlier, she had been involved in a car crash. The accident caused significant damage to both of her knees, leaving her with acute and ongoing knee pain.
“My pain had got to a level where I was using a stick and finding it difficult to walk the dog,” she told reporters earlier this year.
As X-rays later showed, Susan also had end-stage arthritis in both knee joints. But when she visited her GP to request a knee replacement, there was a problem.
“They said I wouldn’t get on a list because I was too young,” she explains. “They said there was nothing they could do other than give me painkillers.”
In desperation, Susan eventually opted to fly to Lithuania for a private knee replacement. This is one reason why her story made headlines earlier this year: “Woman travels to Lithuania for knee surgery after ‘being told she was too young for NHS op’.” (ITV News)
But her experience also raises some important questions about age and knee replacements. Why would UK doctors say she wasn’t old enough for the operation? And did they have a point?
How young is “too young”?
If you look at the statistics for knee replacements, you’ll see the average patient is around retirement age. The UK’s National Joint Registry (NJR) is one of the best databases in the world for the topic. It says the median age of a patient having a total knee replacement is 70 (though patients having a partial replacement were “typically six years younger.”) Of the 1.8 million people in the dataset, less than 7% are under 55. So, statistically at least, Susan was unusually young when she first requested the operation, in her early 50s.
Why would doctors say you’re “too young” for a knee replacement?
It’s not uncommon to hear doctors say a patient is too young for replacement surgery. Indeed, some surgeons say they won’t perform the operation on people below the age of 60. There are two main reasons for this:
Implant lifespan – Although modern artificial knee joints are very strong, normal daily activities still cause significant wear and tear to the knee over time. Eventually, the implant will wear out. We tend to say the lifespan of an artificial knee will be between 15 and 20 years.
Revision risk – Because artificial knees don’t last forever, the chances of your implant wearing out obviously rise the younger you are. If you’re 50 when you have the operation, you might be looking at a revision knee replacement at 65 or 70. Also, younger people tend to place more daily wear on their knees, reducing the implant’s longevity.
What’s the issue with knee revision?
Knee revision is an effective operation, but it isn’t the same as having a first-time replacement. For a start, it’s a longer and more complicated operation, especially if the old implant is being replaced. Surgery involves removing more bone material to accommodate the new implant. The surgeon may also need to place stems into the bone endings to ensure a secure fix. It takes longer to recover from the operation and, overall, the revision implant typically has a shorter lifespan that the original. (You can find out more about how revision surgery works in this blog: What is revision knee replacement?)
But what if you “can’t manage much longer”? Do you still have to wait?
In her interviews at the time, Susan felt she had reached the end of the road with her injured knees. “I couldn’t have managed much longer,” she explained.
When patients ask us about their suitability for a knee replacement, we explain that it’s reserved for the most severe knee cases. But then the question is: what is severe? Essentially, it means:
- Serious cartilage damage – where injury or osteoarthritis has caused significant wear to the cartilage on bone endings (“bone-on-bone” or “end-stage” arthritis)
- Severe, ongoing pain – the pain feels persistent, or even constant, and is becoming overwhelming; it interferes with daily life and makes it difficult to sleep
- Significant impact on daily activities – the pain or stiffness is making it hard or impossible to do basic movements like walking, climbing steps or descending stairs
If these things describe your own situation – if you feel the pain is making it impossible to cope – then it’s hard to argue that your age should be a barrier to knee replacement until you turn 60. That’s not to say age is irrelevant. It’s a vital consideration, and all patients need to be fully informed about the risks and downsides of early knee replacement.
But, clearly, there’s a balance to be struck between immediate need and long-term wellbeing – particularly as implant technology improves and the lifespan of artificial knees gets longer. The bottom line is that knee replacement is a case-by-case treatment. It needs to be carefully debated by you and your surgeon. If that’s something we can help you with, please get in touch. We’d be very happy to help you weigh up the options and make the right choice for your knee pain.
For further reading
Am I too young for a knee replacement?
What are the alternatives to knee replacement?
How long does a knee replacement last?
What can the National Joint Registry tell you about knee replacements?

