How to Check Knee Alignment: 3 Tests for Healthy Knees

Your knees carry you through every step, stride, and squat, but pain often follows when they’re out of alignment. Proper knee alignment is key to healthy movement, whether chasing a ball, chasing your kids, or simply staying active. Many people don’t realize that slight imbalances can lead to stiffness, discomfort, or long-term injury. In this post, we’ll explore three easy ways to check your knee alignment — and keep your knees strong, stable, and pain-free.

Key Takeaways

Proper knee alignment helps prevent pain, improve movement efficiency, and reduce injury risk in daily life and sports.
Try three self-tests to assess your alignment and identify weaknesses or imbalances.
Consult a physiotherapist for a detailed assessment and personalized plan to correct alignment, build stability, and keep your knees strong.

Understanding Knee Anatomy

The knee is one of the body’s most complex and hardworking joints, supporting your weight and allowing smooth, controlled movement. It’s formed where the femur (thigh bone) meets the tibia (shin bone), with the patella (kneecap) protecting the front of the joint.

Stability depends on several key ligaments: the anterior cruciate ligament (ACL) prevents the tibia from sliding forward, while the medial and lateral collateral ligaments stabilize the inner and outer sides. The quadriceps, hamstrings, and patellar tendon work together to bend and straighten the leg efficiently.

Now that you understand how the knee works, let’s explore why alignment matters.

Alignment Is Key

Alignment is essential to your body’s health—whether you’re focusing on overall posture or knee stability. Optimal alignment makes all the difference because it distributes stress evenly across your joints and ligaments, reducing strain on any single area and supporting smooth, efficient movement.

When it comes to your knees, maintaining proper alignment is crucial, whether you’re standing still or moving dynamically. Squatting, hopping, running, and twisting are just a few actions your knees should perform with confidence and control. However, excessive external rotation of the femur or tibia during these movements can disrupt alignment and increase joint stress.

Even with good movement habits, several factors can disrupt proper knee alignment.

Factors Affecting Knee Alignment

Knee alignment is crucial for healthy movement and joint stability. Several factors can disrupt this alignment. Muscle weakness or tightness in the quadriceps, hamstrings, or hip flexors can cause the knee to track improperly during movement. Injuries to stabilizing ligaments, such as the anterior cruciate ligament (ACL), may also compromise alignment. Structural differences like leg length discrepancies or bone shape variations can further affect knee movement.

When alignment is off, certain areas of the joint bear excessive stress, leading to pain, inflammation, or overuse injuries. Tightness in the iliotibial (IT) band often contributes to lateral knee pain. Maintaining alignment through strengthening, flexibility, and physiotherapy helps prevent injury and keeps your knees healthy and pain-free.

Three Simple Tests to Check Your Knee Alignment

While the most accurate assessment comes from a licensed physiotherapist, you can start by trying three simple self-tests at home. These tests can help you understand how well your knees stay aligned and reveal potential weaknesses or imbalances — but remember, a physiotherapist can provide a more thorough and reliable evaluation.

The Squat Test, Single-Leg Squat Test, and Hop Test each build on one another to assess your knee control during static and dynamic movements. Together, they reveal how your knees respond to stability and impact.

Equipment You’ll Need:

A full-length mirror
A firm, flat floor
Comfortable shorts and bare feet

1. The Squat Test

There’s a lot to analyze when it comes to the squat, but to keep things simple, start by focusing on knee alignment when viewed from the front. Stand in front of a mirror and perform a partial squat, paying attention to how your knees align with your feet.

Essential question: Do your kneecaps stay pointed straight toward the mirror?
Check whether your knees are tracking in line with your big toes — this indicates proper alignment. Notice if you feel any deviation or discomfort along the lateral (outer) side of your knees during the movement. If your kneecaps begin turning inward toward each other, this may suggest a valgus alignment (knees collapsing inward). If they move outward excessively, it could indicate varus alignment (knees bowing outward).

If you can perform a squat with good knee alignment and without discomfort, you’re ready to move on to the next test.

2. The Single-Leg Squat Test

The single-leg squat is more advanced and can reveal essential alignment challenges. If you’re a runner, soccer player, or hockey player, performing this test with proper form is especially valuable.

Start by standing on one leg and slowly lowering yourself into a controlled squat.

Essential question: Does your kneecap stay pointed straight toward the mirror? Check whether your hips remain level and your lower leg stays aligned with your thigh as you move. Any wobbling or collapsing may indicate weakness or instability. If you experience pain along the inner (medial) or outer (lateral) knee, it could signal alignment or soft tissue issues. Tenderness along the medial tibia during palpation may also point to underlying structural problems.

When assessing patellar tracking, notice whether the kneecap moves smoothly within its groove. Pain or tenderness near the patella’s upper part (superior pole) may suggest irritation in the quadriceps or patellar tendon.

If you can complete the single-leg squat with good control, proper alignment, and no discomfort, you’re ready to move on to the hop test.

3. The Hop Test

Adding dynamic movement, the hop test takes your knee assessment to the next level. It evaluates how well you can control your knee and maintain alignment during impact.

To begin, stand on one leg in a semi-crouched position with your knee slightly bent—avoid locking it in full extension. From this position, hop forward about two feet and land on the opposite foot. Hold your landing for five seconds, watching in the mirror to see how well you maintain control. Check that your knees and legs stay aligned and that your landing feels stable and balanced.

Pain or instability at the back of your knee during the landing may point to issues with the tibial plateau or cruciate ligaments. Swelling above the kneecap after landing could indicate fluid buildup in the suprapatellar pouch, which can be confirmed by gentle palpation.

Essential question: Did your knee alignment stay steady when you landed? Were your arms or torso twisting to keep your balance? These compensations may reveal weaknesses or alignment problems that need further attention.

What’s Next?

How did you do on your knee tests? These simple self-assessments give you valuable insight into how well you control your knee alignment — a key factor in maintaining healthy, pain-free movement.

While these tests are a great starting point, many factors, including muscle imbalances, flexibility, and injury history, can influence knee alignment. A licensed physiotherapist can identify the root cause of alignment issues and create a personalized treatment plan to restore strength, mobility, and balance.

About Innovation Physical Therapy

At Innovation Physical Therapy, we’ve been helping Edmontonians “Love Getting Better” since 2004. With five convenient clinic locations — Riverbend, Namao, Belvedere, Silverberry, and Central McDougall — we offer exceptional care in a warm, welcoming environment.

Our physiotherapists are movement specialists who focus on long-term recovery. Each treatment plan is individualized, goal-oriented, and designed to help patients return to activity confidently. From manual therapy and sports rehabilitation to vestibular and pelvic floor physiotherapy, our wide range of services ensures comprehensive care for every stage of recovery.

If you have questions about knee health or any other concerns, contact Innovation Physical Therapy today.

Frequently Asked Questions

How do I know if my knees are misaligned?
Look for signs such as pain, uneven movement, or your knees collapsing inward or outward during squats or daily activities.

Can I fix knee alignment on my own?
Basic strengthening and mobility exercises help, but a physiotherapist can accurately identify and correct underlying issues.

How long does it take to correct poor knee alignment?
It varies depending on the cause, but many patients notice improvement within a few weeks of targeted physiotherapy.

Do I need a referral to see a physiotherapist?
No referral is required to book an appointment at Innovation Physical Therapy — you can schedule directly at any of our clinics.

What treatments help improve knee alignment?
Manual therapy, exercise programs, and movement retraining are common approaches. Your physiotherapist will design a plan specific to your needs.

Summary

Knee alignment plays a crucial role in preventing pain and maintaining mobility. You can better understand how your knees move and where imbalances may exist through the Squat Test, Single-Leg Squat Test, and Hop Test. If you experience discomfort or instability, working with a physiotherapist can make all the difference. At Innovation Physical Therapy, we’re dedicated to helping you move better, feel stronger, and enjoy an active life.