What Helping Soldiers Get Ready for Afghanistan Taught Me About Your Knee Pain

By Dr. Shari Miller, PT, DPT, OCS

Orthopedic Specialist & Founder of Stride Lab

In 2010, I was a civilian physical therapist working with soldiers during one of the largest military surges of the Global War on Terror.

These weren't desk jobs. These were men and women preparing to deploy to the mountains of Afghanistan, carrying 80+ pounds of gear on their bodies. Weapons, body armor, ammunition, communication equipment, water. All of it, on them, every single day, in terrain that would wreck most people's knees on a good day.

And some of them were coming for help with knee pain that was keeping them from training for deployment without pain.

Here's what you need to understand about that: for a soldier preparing for combat, knee pain isn't just an inconvenience. It's a safety issue. If your knee is hurting while you're carrying that kind of load, your attention goes to the pain instead of what's happening around you. In a war zone, that split second of distraction, the moment you think about your knee instead of your surroundings, can cost everything.

The stakes were as high as they get. And what I learned treating those soldiers changed how I approach knee pain for every single person I work with today, including you.

The Lesson That Changed Everything: Your Knee Isn't the Whole Story

The first thing I learned working with soldiers was that the knee was almost never the actual problem.

A soldier would come in and say "my knee hurts when I ruck and run." And if I only looked at the knee, I might tape it, ice it, give them some stretches and exercises, and send them on. But that approach, treating the spot where it hurts, only got us so far.

What actually worked was stepping back and looking at the whole picture. How were their hips handling the load? Did they have flexibility of their hamstrings? Was the ankle stiff from an old sprain, forcing the knee to absorb movement it wasn't designed for? Had they been compensating so long that their body had essentially rewired how they moved?

Nine times out of ten, the knee was the victim, not the cause. The real drivers were above or below the joint. And until we addressed those, the knee pain kept coming back.

This is exactly what I see with my clients today. The knee hurts, yes. But the knee is telling you about a problem somewhere else in the chain.

What a Loaded Ruck and a Grocery Run Have in Common

I know what you might be thinking: I'm not a soldier. I'm not carrying 80 pounds through the mountains. How does this apply to me?

More than you'd expect.

When a soldier carries a heavy load, every weakness in their body gets exposed. If the hip is weak, the knee compensates. If the ankle is stiff, the knee absorbs the impact. If the core isn't stabilizing the trunk, the knee works overtime.

The same thing happens to you, just at a different scale.

When you carry grocery bags from the car to the house and your knee starts aching by the third trip, that's the same pattern. When you walk through the airport pulling a rolling bag and your knee is screaming by the time you reach the gate, that's the same pattern. When you hike a trail with a daypack and can barely get down the last mile, that's the same pattern.

The load is different. The stakes are different. But the body mechanics are identical. A weak link in the chain shows up when demand increases, whether that demand is a combat ruck or a week of vacation walking.

And the fix is the same too: find the weak link, strengthen it, and teach the body to distribute the load properly so the knee stops taking on more than its share.

Why "Just Rest It" Doesn't Work (and Soldiers Taught Me Why)

Rest was not an option for the soldiers I worked with. They had deployment timelines. They had physical standards to meet (and getting a profile to modify could be career ending). They had a mission.

So we couldn't just say "take it easy for a few weeks and see how you feel." We had to figure out what was actually driving the problem, build strength in the right places, and get them back to full capacity on a timeline.

And you know what? That urgency actually led to better outcomes.

Here's why. When someone rests a painful knee for weeks without addressing the root cause, the muscles around the knee get weaker. The joint gets stiffer from not moving. And when they finally try to return to activity, the knee is actually less prepared than it was before the rest. So it hurts again. And they rest again. And the cycle continues.

With the soldiers, we didn't have the luxury of that cycle. We had to load the knee carefully, progressively, in the right way while building up the muscles around it. We started with what they could tolerate and added challenge over time. Not randomly. Not aggressively. Methodically.

And it worked. Soldiers who came in unable to ruck 8 miles were deploying with their units on schedule. Not because of a miracle. Because we gave their body the specific input it needed, in the right order, at the right pace.

This is the exact same approach I use with my clients now. Whether you're trying to get back to a workout class, a hiking trail, or just walking the dog without pain, progressive, targeted strengthening beats rest every single time.

The Mental Game: When Pain Takes Up Space in Your Brain

Here's something most people don't talk about, but the soldiers taught me to pay attention to it.

When your knee hurts, it takes up mental bandwidth. You're constantly doing math in your head: Can I make it up those stairs? Should I park closer? If I go on this walk, will I pay for it tonight?

For a soldier, that mental bandwidth had to go toward situational awareness. Every ounce of attention on knee pain was an ounce taken away from something that mattered more. My job was to get their knee quiet enough that they could stop thinking about it and put their focus where it belonged.

Your life isn't a war zone. But the same principle applies.

When your knee takes up space in your brain, it changes how you make decisions. You say no to things you want to say yes to. You plan your day around what your knee might do instead of what you want to do. You stop being spontaneous because you're always calculating risk.

That mental load, the constant uncertainty of will my knee cooperate today? is exhausting. And it's one of the first things that gets better when you start building strength and trust back into the joint. Not because the pain vanishes overnight, but because you start to understand what's happening and have a plan for it. The uncertainty gets replaced with confidence. And confidence changes everything.

What I Took from the Military and Brought to My Practice

Working with soldiers didn't just teach me clinical techniques. It taught me a philosophy that I carry into every interaction with my clients:

Don't just chase the pain, find what's driving it. Your knee might hurt, but the answer might live in your hip, your ankle, or a movement pattern you picked up years ago without realizing it.

Load the body progressively, not randomly. You can't skip steps. You can't go from resting to running. The body needs to rebuild in a specific order, starting with what it can handle right now and moving forward from there.

Small, consistent work beats big, sporadic efforts. The soldiers who did their exercises daily even when the exercises felt small and boring, were the ones who got back to full duty. The ones who skipped the "easy" stuff and tried to push through were the ones who kept re-injuring. The same applies at home.

Understand the why. The soldiers I worked with were smart. They didn't just want to be told "do this exercise." They wanted to know why it mattered. And when they understood the connection "your hip weakness is making your knee absorb extra force, so we need to fix the hip first" they bought in. They trusted the process. And they did the work.

That's the same thing I try to give you. Not just exercises. Understanding. Because when you understand what's happening in your body, you stop being afraid of it. And that's when things start to change.

You Don't Need to Carry 80 Pounds to Benefit from This Approach

The principles I learned helping soldiers get deployment-ready are the same ones I use to help someone trust their knee on a hiking trail. To help a mom keep up with her kids at the amusement park without having to sit on every bench. To help someone walk into a group fitness class and know they belong there, not because they'll never modify, but because they understand their body well enough to know what's right for them.

You don't need a military background to benefit from military-grade problem solving. You just need someone who knows how to look at the whole picture, find the real drivers, and build you a plan that meets you exactly where you are.

Your knee isn't broken. Your body hasn't failed you. It just needs the right kind of attention and it will respond.

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About Dr. Shari Miller Dr. Shari Miller (PT, DPT, OCS) is an orthopedic specialist and founder of Stride Lab. With over 17 years of orthopedic experience including treating soldiers preparing for combat deployment, she helps active adults understand why their body is doing what it's doing and gives them a clear, manageable path forward.