Knee Pain When Squatting: The Real Reason It's Happening (And How to Fix It)

Someone told you squatting is bad for your knees.

Maybe it was a doctor after an X-ray. Maybe it was a well-meaning trainer at the gym. Maybe it was a friend who swears they ruined their knees squatting years ago. Whoever it was, the message was clear: stop squatting, protect your knees.

Here's the problem with that advice: it's wrong. And following it doesn't just fail to fix the problem — it often makes it worse.

Squatting is one of the most fundamental human movement patterns. Every time you sit down, stand up, get in and out of a car, climb stairs, or pick something up off the floor, you're squatting. Telling someone to avoid squatting doesn't protect their knees. It just means those exact same mechanics are happening uncontrolled, throughout their entire day, with zero strength to support them.

At True North Physical Therapy in Sioux Falls, knee pain with squatting is one of the most common complaints we see in active adults. And in the overwhelming majority of cases, the knee is not the problem. The knee is where the pain is. That's different.

This post will explain what's actually causing your knee pain when you squat, walk you through a simple self-test you can do right now, break down the most common diagnoses you may have been given, and lay out the three-step process we use to fix it for good.

Why the Squat Isn't the Problem

The knee joint is a hinge. It bends and straightens. It's designed to handle significant compressive and shear load — that's literally what it's built for. Squatting, done with appropriate mechanics and progressive load, is one of the best things you can do for long-term knee health.

The reason squatting causes pain for so many people isn't the movement itself. It's that the movement reveals a weakness somewhere else in the system — and that weakness forces the knee to absorb forces it wasn't designed to handle alone.

The two most common culprits, in the active adults we see at True North, are weak hips and restricted ankle mobility. When either of these is present, the knee compensates. And a compensating knee eventually becomes a painful knee.

Let's look at how each one works.

Weak Hips: The #1 Driver of Knee Pain in Active Adults

Your glutes — specifically your gluteus medius and gluteus maximus — are responsible for controlling the position of your femur (thigh bone) during every load-bearing movement. When you squat, lunge, run, or climb stairs, your glutes are supposed to hold your knee in alignment over your second toe, preventing it from collapsing inward.

When the glutes are weak or not firing properly, the femur collapses into internal rotation on every repetition. This drives the kneecap (patella) out of its groove and increases stress on the medial (inner) structures of the knee. Pain at the front of the knee, inner knee, or behind the kneecap is almost always this pattern.

The telltale sign: your knees cave inward as you squat down, especially as you fatigue. You may have been told to "push your knees out" as a cue — but if your glutes aren't strong enough to hold that position, the cue won't fix the problem long-term. Strength will.

A caving knee during a squat isn't a knee problem. It's a glute problem revealing itself at the knee.

Restricted Ankle Mobility: The Hidden Driver Nobody Talks About

The second major contributor is ankle dorsiflexion — your ability to bend your ankle so your shin moves forward over your foot. If your ankle can't move freely in this direction (usually due to a tight calf complex or prior ankle sprains that were never fully rehabbed), your body finds the range somewhere else.

Where does it find it? The knee. Restricted ankle mobility causes increased forward lean of the trunk, increased knee valgus (caving), and elevated patellar tendon load — all of which create anterior knee pain, patellar tendinopathy, and patellofemoral syndrome.

Many people with restricted ankle mobility compensate by lifting their heels slightly as they squat (intentionally or without realizing it). If your squatting feels better with your heels elevated — on a plate, a wedge, or a slight heel raise — restricted ankle mobility is almost certainly part of your story.

Try This: The Ankle Wall Test

This is a simple screen you can do at home to check your ankle dorsiflexion range. It takes about 60 seconds.

How to do it:

•       Stand facing a wall, barefoot

•       Place your toes 4 inches from the wall (use a tape measure or your hand width for consistency)

•       Keep your heel flat on the floor and drive your knee forward toward the wall, tracking your knee over your second toe

•       If your knee can touch the wall without your heel lifting, you have adequate ankle dorsiflexion for squatting

•       If your heel lifts before your knee reaches the wall, you have restricted ankle mobility

•       Test both sides — asymmetry between left and right is particularly significant

A positive test (heel lifts before contact) doesn't mean something is wrong with your ankle structurally. It means your calf complex is restricting motion, and that restriction is being transferred as additional load to your knee every time you squat.

If your heel lifts during the ankle wall test, your knee has been compensating for your ankle on every squat rep — for years.

What Your Diagnosis Actually Means

If you've been seen for knee pain with squatting, you may have been given one of these diagnoses. Here's what they actually mean in plain language — and why the treatment approach matters more than the label.

Patellofemoral Pain Syndrome (PFPS)

Pain behind or around the kneecap, typically worse with squatting, stairs, and sitting for long periods. Caused by the kneecap tracking improperly in its groove due to hip weakness and/or tight lateral structures. Very responsive to the approach outlined below. Most people fully resolve in 6–10 weeks.

Patellar Tendinopathy ("Jumper's Knee")

Pain directly at the bottom of the kneecap where the patellar tendon attaches. Common in athletes who do a lot of jumping, squatting, and explosive loading. Caused by load that exceeds the tendon's capacity — almost always driven by hip and ankle dysfunction increasing the demand on the tendon. Responds exceptionally well to progressive eccentric loading.

IT Band Syndrome

Sharp or burning pain on the outer side of the knee, especially during activity. The IT band itself is rarely the primary problem — it's tight because the hip abductors are weak and the IT band is compensating. Foam rolling the IT band provides temporary relief but doesn't fix the underlying hip weakness driving the tension.

Chondromalacia / Cartilage Wear

Some degree of cartilage change is present in most adults over 35 and is often found on imaging. As with lumbar disc findings, cartilage changes on an MRI don't necessarily correlate with pain or function. Many people with significant cartilage findings have no symptoms; many people with significant symptoms have minimal imaging findings. The appropriate question isn't "how much cartilage do I have" but "is the knee being loaded correctly." Improved mechanics and strength routinely reduce or eliminate symptoms even when structural changes are present.

The 3-Step Fix

At True North, we use a consistent three-step process to resolve knee pain with squatting. It works because it addresses the actual cause of the problem, not just the symptoms.

Step 1: Calm the Tissue

Before we can load the knee progressively, we need to reduce the acute irritation. This typically takes one to two weeks and involves temporary load modification (not elimination), manual therapy to the surrounding soft tissue, and targeted work to identify exactly which movement provokes pain and at what threshold.

This step is not rest. It's strategic loading — finding the range and level of effort where the knee can move without increasing irritation, and using that as the starting point for rebuilding.

Step 2: Build the Foundation: Glutes and Ankle Mobility

This is the core of the fix, and it's where most standard approaches fall short. Treating the knee without addressing hip strength and ankle mobility is like fixing a symptom and ignoring the cause.

The three priority exercises at this stage:

•       Hip thrusts / glute bridges: The most direct way to build glute max strength in a hip-dominant pattern. Start with bodyweight, progress to loaded. Three sets of 12–15, three times per week.

•       Lateral band walks: Directly targets gluteus medius — the muscle responsible for knee alignment during single-leg phases of squatting and running. Low load, high feedback. Essential for retraining the motor pattern.

•       Eccentric calf drops: The single best intervention for improving ankle dorsiflexion range and calf complex extensibility. Standing on a step, lower your heel slowly over 3–4 seconds below the step edge. Two to three sets of 15 daily.

Ankle mobility work (calf stretching, ankle circles, ankle wall mobilizations) complements this phase and should be done daily — it's simple and takes less than five minutes.

Step 3: Rebuild the Pattern

Once hip strength and ankle mobility have improved measurably, we rebuild the squat pattern with the new foundation in place. This phase focuses on progressive loading — gradually increasing depth, load, and demand while monitoring the knee's response using the 24-hour rule from our Modify, Don't Stop framework.

Typical progression: goblet squat → box squat at progressively lower depth → full squat with load → single-leg variations. Most people return to full, loaded squatting within 6–10 weeks of starting this process.

The goal isn't just to get back to pain-free squatting. It's to build a knee that's stronger and more resilient than it was before the pain started — so this doesn't come back.

The goal isn't just pain-free squatting. It's a knee that's stronger than before the pain started.

What This Looks Like at True North

When a patient comes in with knee pain during squatting, the first thing we do is watch them move. Not just their knee — their entire body. We look at ankle mobility, hip control, trunk position, and whether the pattern is symmetric or asymmetric.

Within the first visit, we know exactly what's driving the pain. We treat it that day — manual therapy, targeted exercises, a modification plan for training — and send the patient home with a clear understanding of what's happening and what the path forward looks like.

Most patients notice meaningful improvement within two to three sessions. Full resolution — meaning back to training with confidence and no pain — typically takes six to ten weeks, depending on how long the problem has been present and how consistently the home program is followed.

There is no reason to stop squatting, stop training, or accept knee pain as a permanent feature of getting older. Weak hips and restricted ankles are both very fixable problems.

The Bottom Line

Squatting is not bad for your knees. Squatting with weak glutes, restricted ankles, and no plan is hard on your knees. That's a different problem — and it has a clear solution.

If your knees hurt when you squat, the most important thing you can do is get a proper movement assessment so you know exactly what's driving the problem. Not an X-ray of the knee. Not an MRI of the cartilage. A movement assessment that looks at how the whole system is working together.

The fix is almost never complicated. It's just rarely done correctly — because most approaches treat where it hurts instead of why it hurts.

→  Knee pain stopping you from squatting, lifting, or staying active?

Schedule a movement assessment at True North. Treatment starts on your first visit — you'll leave with answers and a plan.

www.sdtruenorthpt.com  |  605-681-6082  |  3801 W Technology Cir, Sioux Falls SD 57106