Running With Knee Osteoarthritis: Where to Start

Plenty of people are told to stop running after a knee X-ray comes back showing osteoarthritis. They are usually in their forties or fifties, still playing social touch or park run, and the scan report reads like a verdict. What the scan does not describe is how much load that knee can currently tolerate, which is the thing that actually determines what you can do.

Running with knee osteoarthritis is a load management problem. Imaging findings and symptoms line up loosely at best. People with significant changes on imaging sometimes run comfortably, and people with mild changes sometimes struggle to walk to the shops. The knee in front of us tells us more than the report does.

What the diagnosis actually describes

Osteoarthritis involves changes across the whole joint: cartilage, the bone underneath it, the joint lining and the surrounding muscles. It is not a simple wearing away of a fixed amount of cartilage that gets used up faster the more you run.

The RACGP's guideline for the management of knee and hip osteoarthritis puts land-based exercise and strength work at the front of management, ahead of most other options. That matters for runners, because the advice to stop moving tends to reduce the strength and capacity around the joint over months, which usually makes daily activity harder rather than easier.

The 24-hour rule

The most useful marker in an arthritic knee is not what it feels like during activity, it is what it feels like the next morning. A knee that aches during a run and settles within a day is generally tolerating that load. A knee that is stiff and swollen the following morning and takes two days to settle was pushed past what it could handle that week.

This gives you something to work with. Rather than a fixed rule about distance, you have a response you can measure and a dial you can turn.

What assessment involves

We go through your history first: how long the knee has been symptomatic, what aggravates it, morning stiffness duration, whether it swells, any locking or giving way, and what your current running or sport looks like week to week.

Physical assessment covers knee range, particularly whether you can straighten fully, quadriceps and glute strength tested side to side, single leg squat and step-down control, and calf endurance. Weakness on the affected side is common and it is measurable, which means progress is measurable too.

We also watch you walk and run. Stride length, cadence, how much the knee collapses inward under load, and how much time you spend on each leg.

A knee that locks, gives way repeatedly, swells dramatically or has changed suddenly should be reviewed medically. So should any knee where night pain is a prominent feature.

Strength work comes first

Most programs start with building strength through the quads, glutes and calf, in ranges the knee tolerates. Loaded work through partial range often suits knees that object to deep flexion. Progress is tracked by weight lifted and repetitions rather than feel.

This is unglamorous and it is the part that carries the running. A quadriceps that can absorb landing force takes demand off the joint surface itself.

Where reduced body weight running fits

An anti-gravity treadmill reduces the percentage of body weight going through your legs while you run. Someone at 85 kg running at 65 percent body weight is loading the knee closer to 55 kg through each stride, plus reduced impact forces.

For an arthritic knee, this offers a way to keep running while the load stays inside what the joint tolerates. Someone who cannot manage 20 minutes at full body weight without a stiff knee the next day may manage 25 minutes at 65 percent with a settled morning after. Support is then reduced gradually across weeks, guided by that 24-hour response, while the strength work continues underneath it.

It is also used the other way around, holding the support level steady and increasing duration or pace, so only one variable changes at a time.

This approach is one option among several. It suits people who want to keep running specifically, and it is not necessary for everyone with knee osteoarthritis.

What a session looks like

Sessions run around 45 minutes. We check how the knee responded to the previous week, run through strength testing where relevant, then move to the treadmill. Body weight percentage, pace and duration are set for that day, and we watch your running while you go rather than leaving you to it. Cadence often gets a look, since a slightly shorter stride at a higher step rate changes how force arrives at the knee.

You leave with the week's plan: which runs happen outdoors, which happen unweighted, what strength work sits alongside them, and what response would mean pulling back.

When to book

Come in if you have been told to stop running and want to know what your knee can actually handle, if running has become inconsistent because of knee symptoms, or if you have been managing with rest and painkillers and want a loading plan instead.

If you want an assessment of your knee and a running plan built around what it currently tolerates, you can book at our Inner West clinic.