Osteoarthritis is still very commonly described as “wear and tear”.
Most patients have heard the phrase often early, sometimes casually, and usually without much explanation. Unfortunately, it’s also a phrase that creates fear, confusion, and a sense of inevitability.
As a knee surgeon, I rarely use it anymore. Not because osteoarthritis isn’t real or progressive, but because “wear and tear” doesn’t reflect how joints actually behave, and it often leads people to the wrong conclusions.
A much more accurate and helpful way to think about osteoarthritis is:
“Flare, wear and repair”
The problem with “wear and tear”
“Wear and tear” suggests a very specific story:
that joints wear out like tyres
that damage only goes in one direction
that pain will steadily worsen no matter what
that activity inevitably makes things worse
Understandably, patients then think:
“If I keep using my knee, I’ll just make it worse.”
But clinically and biologically that isn’t what we see because osteoarthritis is not a straight downhill slope
If osteoarthritis were simply mechanical wear:
pain would steadily increase year on year
scans would closely match symptoms
rest would always help
activity would always harm
In reality:
symptoms come and go
pain can fluctuate dramatically
scans often look worse than the knee feels
people can feel awful during one phase and much better a few months later
That tells us something important:
Osteoarthritis is dynamic, not static.
A better way to understand it:
“Flare, Wear and Repair”
🔥 Flare
A flare is when symptoms suddenly worsen and can be triggered by:
a change in activity
a knock or minor injury
doing too much after doing too little
illness, stress, or poor sleep
During a flare:
the joint lining becomes irritated
inflammation increases
fluid may build up
pain and stiffness worsen
muscles disengage
Crucially, a flare does not mean the joint has suddenly deteriorated or “collapsed”.
⚙️ Wear
Yes — structural changes do occur over time and these may include:
thinning of cartilage
small areas of bone change
altered joint shape
But this process:
happens slowly
varies enormously between people
does not neatly correlate with pain
Many people with advanced changes on X-ray function remarkably well.
Others with relatively mild changes struggle more. Pain is influenced by far more than structure alone.
🔧 Repair
This is the part the “wear and tear” model completely misses.
Joints are living, adaptable organs:
cartilage responds to load
bone remodels
muscles protect and stabilise
inflammation can settle
With the right conditions:
pain improves
movement becomes easier
confidence returns
Strength, movement, pacing, weight management, sleep, and education all actively support this repair and adaptation phase.
Why language really matters
How we explain arthritis changes how people behave.
If someone believes:
“My knee is worn out”
They often will:
avoid movement
lose strength
gain weight
fear activity
worsen symptoms
If instead they understand:
“My knee flares, adapts, and can recover”
They are far more likely to:
stay active
manage flares calmly
rebuild strength
delay or avoid unnecessary intervention
What about scans and X-rays?
Scans are snapshots, not predictions.
They show:
structure, not pain
anatomy, not function
change, not destiny
An MRI or X-ray does not tell you:
how bad your pain will be
whether things will worsen
whether surgery is inevitable
Your symptoms, function, and quality of life matter far more.
So where does knee replacement fit into this?
It’s important for me to be clear.
I’m a knee surgeon, and for some people knee replacement surgery is absolutely the right treatment but at the right time.
Reframing osteoarthritis as flare, wear and repair does not mean:
surgery is never needed
symptoms should be ignored
people should simply “put up with it”
What it does mean is that surgery should be based on symptoms and impact on life, not fear created by language.
When knee replacement is appropriate
Surgery is usually considered when:
pain is persistent and life-limiting
symptoms are present most days, not just during flares
sleep, work, or enjoyment of life are affected
non-surgical treatments no longer give reliable relief
At that point, a knee replacement can be:
highly reliable
genuinely life-changing
and very effective at restoring quality of life
When it’s not the right time
Many people are told they have “bone on bone” arthritis and assume surgery is urgent or inevitable.
In reality:
many people live well for years with arthritis
flares settle
function remains good
strength and confidence can be rebuilt
Offering a knee replacement too early helps no one.
The real role of a knee surgeon
My job isn’t simply to operate, it’s to help patients understand what’s happening in their knee, manage flares without panic and use non-surgical options effectively.
It’s important to recognise when the balance has shifted and surgery will genuinely help.
A successful knee replacement is as much about timing and preparation as it is about the operation itself.
Understanding the condition properly allows patients to approach surgery from a position of confidence, not fear and that leads to better outcomes.
Ask Debbie about a consultation
Related reading
You may also find these helpful: Why does my knee hurt going down stairs?, Why does my knee hurt when it rains?, Is running bad for your knees? and Golf and knee health. You can find all of Nev’s articles on the blog.
