Knee Pain After 40: What’s Really Going On and How to Get Back to Moving

If you’ve recently noticed that climbing stairs feels harder than it used to, or that your knees ache after a long walk, you’re not alone. Knee pain becomes increasingly common after the age of 40 — and while it can feel discouraging, the good news is that it’s usually very manageable with the right approach.

Let’s break down what’s actually happening in your knees, why age plays a role, and what you can do to feel better and move more freely.

Why Knee Pain Gets More Common After 40

The knee is one of the most complex joints in the body. It relies on a delicate balance of cartilage, ligaments, tendons, and muscles working together to keep you stable and moving. Over time, several things begin to shift:

Cartilage Wear and Osteoarthritis

The most common culprit behind knee pain in people over 40 is osteoarthritis — a condition where the cartilage that cushions the ends of your bones gradually wears down. Think of cartilage like the shock absorbers in a car. When it thins out, bones start to rub more against each other, causing pain, stiffness, and swelling.

Osteoarthritis doesn’t happen overnight. It develops slowly over years of use, and genetics, body weight, and previous injuries can all speed up the process.

Muscle Weakness and Imbalance

As we age, we naturally lose muscle mass — a process called sarcopenia. The muscles around the knee, especially the quadriceps (the large muscles at the front of your thigh), play a crucial role in protecting the joint. When those muscles weaken, more stress falls directly on the knee itself.

Reduced Flexibility and Movement

Tendons and ligaments also become less elastic with age, making the joint stiffer. If you’ve also become less active over the years — which is very common — the surrounding tissues tighten further, making movement more uncomfortable.

Common Symptoms to Watch For

Knee pain over 40 can show up in different ways. You might notice:

• A dull ache during or after activity
• Stiffness first thing in the morning or after sitting for a long time
• Swelling or puffiness around the joint
• A grinding or clicking sensation when you bend your knee
• Difficulty fully straightening or bending the leg

These symptoms don’t automatically mean something serious is wrong — but they are signals worth paying attention to.

What the Research Says About Treatment

Here’s something that surprises many people: staying active is actually one of the best things you can do for arthritic knee pain. Rest might seem like the obvious answer, but extended inactivity can cause muscles to weaken further and joints to stiffen up even more.

A landmark study published in BMJ and indexed on PubMed found that exercise therapy significantly reduced pain and improved physical function in people with knee osteoarthritis — with effects comparable to, or better than, some medications. You can read the full study here.

Additionally, research published in PMC confirmed that land-based exercise programs — including strength training and aerobic exercise — are effective and safe for reducing knee pain and improving quality of life in people with osteoarthritis. View the full research here.

The takeaway? Movement, done correctly and consistently, is medicine for your knees.

How Physiotherapy Can Help

Working with a physiotherapist is one of the most effective ways to address knee pain — especially when you’re not sure where to start or you’re worried about making things worse.

A physiotherapist will assess how your knee is moving, identify any muscle imbalances, and create a personalized plan to reduce your pain and rebuild strength. This isn’t a one-size-fits-all approach — it’s targeted, evidence-based care designed around your body and your lifestyle.

At Wellness Place, our physiotherapy team works with patients every day who are dealing with exactly this kind of knee pain. Whether you’re dealing with early-stage osteoarthritis, a nagging old injury, or general stiffness that’s gotten worse with age, we can help you move better and feel better.

What a Physio Program Might Include

• Strengthening exercises targeting the quads, hamstrings, and glutes to take pressure off the joint
• Flexibility and mobility work to reduce stiffness and improve range of motion
• Manual therapy — hands-on techniques to ease tension and improve joint movement
• Activity guidance — learning how to stay active without flaring up your symptoms

You Don’t Have to Just Live With It

Knee pain after 40 is common — but it’s not inevitable, and it’s definitely not something you have to accept as your new normal. With the right support, most people see meaningful improvement in their pain levels and their ability to do the things they love.

If you’re in Newmarket or the surrounding area and you’re ready to take the first step, reach out to our team at Wellness Place. We’d love to help you get back to moving with confidence.