ACL Injury & Reconstruction Physiotherapy in North York & Don Mills

What Is the ACL?

The anterior cruciate ligament (ACL) is one of the major ligaments inside the knee.

It contributes to controlling movement of the tibia relative to the femur and helps provide stability during demanding activities involving:

• Pivoting
• Cutting
• Rapid changes of direction
• Landing
• Deceleration

ACL injuries are particularly common in sports such as soccer, basketball, skiing, volleyball and other activities involving jumping or rapid directional changes.

However, ACL injuries can also occur during recreational activities, falls and other traumatic knee injuries.

What Does an ACL Injury Feel Like?

Symptoms vary depending on the injury and whether other knee structures are also involved.

People may experience:

• A popping sensation at the time of injury
• Sudden knee pain
• Rapid swelling
• Difficulty bearing weight
• Reduced knee movement
• Difficulty fully straightening the knee
• A feeling that the knee gives way
• Difficulty walking
• Difficulty pivoting or changing direction
• Reduced confidence using the knee

Pain may decrease after the initial injury even when weakness or episodes of giving way remain.

Not every ACL injury feels the same, and symptoms alone cannot determine whether the ligament is partially or completely torn.

How Do ACL Injuries Happen?

Many ACL injuries occur without direct contact.

Common injury situations include:

• Sudden pivoting
• Cutting or changing direction
• Landing from a jump
• Sudden deceleration
• Twisting on a planted foot

ACL injuries can also occur after direct contact or trauma to the knee.

An ACL injury should not automatically be interpreted as evidence that someone had poor movement, weak muscles or incorrect technique before the injury.

ACL injuries are influenced by multiple factors, and the circumstances vary considerably between individuals.

Can an ACL Injury Occur With Other Knee Injuries?

Yes.

ACL injuries may occur together with injuries involving:

• Meniscus
• Medial collateral ligament (MCL)
• Articular cartilage
• Other knee ligaments
• Bone bruising

Associated injuries may influence symptoms, treatment decisions and rehabilitation progression.

This is one reason a thorough knee assessment is important after a significant twisting or traumatic injury.

How Is an ACL Injury Diagnosed?

Diagnosis usually combines the history of the injury with a clinical knee examination.

Assessment may include specific ligament tests used to evaluate ACL integrity and overall knee stability.

MRI may be used when confirmation of the injury or assessment of associated structures such as the meniscus or cartilage would help guide management.

An X-ray does not show the ACL itself but may be used after significant trauma when fracture or another bone injury needs to be considered.

How Does a Physiotherapist Assess an ACL Injury?

Your physiotherapist will ask about:

• How the injury occurred
• Swelling
• Pain
• Giving way or instability
• Walking
• Previous knee injuries
• Sport and exercise participation
• Work demands
• Imaging or surgical findings
• Your activity goals

The physical assessment may include:

• Knee mobility
• Swelling
• Quadriceps activation
• Leg strength
• Walking
• Balance
• Single-leg function
• Ligament testing when appropriate
• Functional tasks

Later-stage assessments may include:

• Strength testing
• Running ability
• Hopping
• Jumping and landing
• Agility
• Change-of-direction tasks
• Sport-specific activities

The assessment changes as you progress through rehabilitation.

Do All ACL Tears Require Surgery?

No.

ACL reconstruction is not automatically required for every ACL tear.

Some people regain good knee function with structured rehabilitation and return to desired activities without reconstruction.

The decision between non-operative rehabilitation and surgery may consider:

• Episodes of knee giving way
• Activity and occupational demands
• Participation in pivoting sports
• Associated meniscus or ligament injuries
• Functional progress with rehabilitation
• Personal goals and preferences

For some people, a period of rehabilitation can also provide useful information about how the knee functions before deciding whether surgery is appropriate.

The decision should be individualized with the appropriate healthcare professionals.

Can Physiotherapy Help an ACL Tear Without Surgery?

Yes.

Non-operative ACL rehabilitation may focus on:

• Restoring knee movement
• Managing swelling
• Rebuilding quadriceps strength
• Strengthening the hamstrings, hips and calf
• Improving walking
• Developing single-leg strength and control
• Improving balance
• Building cardiovascular fitness
• Progressing running when appropriate
• Preparing for work, exercise or recreational activities

For people returning to demanding pivoting sports, the decision about whether non-operative management is appropriate requires individualized assessment and discussion.

The goal is not simply to compensate for a “missing ligament.”

It is to build the physical capacity and confidence required for the activities you want to perform.

Can Physiotherapy Help Before ACL Reconstruction?

Yes.

Rehabilitation before surgery is often called prehabilitation or prehab.

Depending on the knee and surgical plan, prehab may focus on:

• Reducing swelling
• Restoring knee extension
• Improving knee flexion
• Rebuilding quadriceps strength
• Improving walking
• Maintaining hip and leg strength
• Maintaining general fitness
• Preparing for early post-operative exercises
• Understanding what to expect after surgery

A knee that moves well and has good muscle function before surgery can provide a useful starting point for post-operative rehabilitation.

Pre-operative rehabilitation should still be individualized according to the injury, associated knee problems and surgeon’s recommendations.

How Does Physiotherapy Help After ACL Reconstruction?

ACL reconstruction rehabilitation is a progressive process.

Early rehabilitation focuses on recovery from surgery and gradually progresses toward strength, running and higher-level activities when appropriate.

Rehabilitation may include:

• Swelling management
• Restoring knee movement
• Quadriceps activation
• Walking rehabilitation
• Progressive strengthening
• Single-leg exercise
• Balance and coordination
• Cardiovascular conditioning
• Running progression
• Jumping and landing
• Agility
• Change-of-direction training
• Sport-specific rehabilitation

Your progression should reflect both healing after surgery and your functional recovery.

What Are the Stages of ACL Rehabilitation?

ACL rehabilitation is better viewed as a progression than as a rigid calendar.

Early Rehabilitation

Early goals may include:

• Managing swelling
• Restoring knee extension
• Progressively improving knee flexion
• Activating the quadriceps
• Walking appropriately with or without an assistive device
• Regaining basic functional independence

Your surgeon’s instructions regarding weight bearing, bracing and other restrictions should be followed.

Strength and Functional Rehabilitation

As recovery progresses, rehabilitation increasingly emphasizes:

• Quadriceps strength
• Hamstring strength
• Hip strength
• Calf strength
• Single-leg strength
• Balance
• Functional movements
• Cardiovascular fitness

Exercises may progress toward:

• Squats
• Split squats
• Step-ups
• Step-downs
• Lunges
• Leg press
• Hamstring strengthening
• Calf raises
• Single-leg exercises

Exercise selection depends on your stage of recovery, graft considerations, symptoms and goals.

Running Rehabilitation

Running should not begin simply because a certain number of weeks has passed.

Before starting a running progression, your physiotherapist may consider:

• Knee swelling
• Knee movement
• Strength
• Single-leg function
• Tolerance of impact-related exercises
• Surgical recovery
• Overall readiness

Running is then gradually progressed rather than immediately returning to previous distances or speeds.

Jumping, Landing and Agility

People returning to sports may later progress to:

• Jumping
• Hopping
• Landing
• Acceleration
• Deceleration
• Agility
• Cutting
• Change of direction
• Reactive drills

These activities should be introduced progressively according to the demands of the person’s sport.

Return-to-Sport Rehabilitation

Returning to sport is not a single event.

It is a progression from rehabilitation exercises to training and eventually to unrestricted participation when appropriate.

Return-to-sport decisions may consider:

• Time since surgery and biological recovery
• Knee symptoms
• Strength
• Functional testing
• Running capacity
• Hopping and jumping ability
• Agility
• Sport-specific demands
• Confidence and psychological readiness
• Surgeon recommendations

Passing one test or reaching one date does not automatically mean an athlete is ready for every sport.

Why Is Quadriceps Strength Important After an ACL Injury?

Quadriceps weakness is common after ACL injury and reconstruction.

The quadriceps are important for:

• Walking
• Stairs
• Squatting
• Running
• Jumping
• Deceleration
• Sport

Early after injury or surgery, swelling and changes in muscle activation can make it difficult to contract the quadriceps effectively.

As rehabilitation progresses, exercises should become sufficiently challenging to rebuild strength.

This may eventually require progressive resistance exercise rather than continuing only with basic early-stage exercises.

What Exercises Help ACL Recovery?

There is no single ACL exercise program that is appropriate for every stage of rehabilitation.

Depending on your recovery, exercises may include:

• Knee mobility exercises
• Quadriceps strengthening
• Hamstring strengthening
• Hip strengthening
• Calf strengthening
• Squats
• Step exercises
• Lunges
• Single-leg exercises
• Balance exercises
• Cardiovascular conditioning
• Running drills
• Jumping and hopping
• Agility and sport-specific exercises

The important principle is progression.

Exercises that are appropriate shortly after injury or surgery should not remain the entire rehabilitation program months later.

[Internal link: Knee Exercise Video Library]

What Can I Do at Home After an ACL Injury or Reconstruction?

Your home program depends on whether you are recovering without surgery, preparing for surgery or recovering after reconstruction.

Follow Your Medical or Surgical Instructions

If you have had surgery, follow your surgeon’s instructions regarding:

• Weight bearing
• Brace use
• Wound care
• Assistive devices
• Driving
• Activity restrictions

Work on Your Prescribed Exercises

Your physiotherapist may prescribe exercises for mobility, quadriceps activation and strengthening according to your recovery stage.

Do not add advanced exercises simply because they appear in an online ACL program.

Monitor Knee Swelling

Some swelling may occur as activity increases.

A significant increase in swelling can be a sign that the current activity or exercise load needs to be reviewed.

Stay Active Within Your Current Stage

As recovery progresses, appropriate cardiovascular activity may help maintain fitness.

Your physiotherapist can help determine which activities are suitable.

Progress Gradually

A good ACL program changes over time.

Walking, strength, running and sport-specific activity should be progressively rebuilt rather than resumed all at once.

Is Swelling Normal After ACL Injury or Surgery?

Swelling is common after an acute ACL injury and after reconstruction.

It should generally improve as recovery progresses, although temporary increases may occur after increases in activity.

Persistent or substantially increasing swelling may affect quadriceps function and may indicate that activity needs to be adjusted or the knee reassessed.

Sudden swelling associated with a new injury, significant pain or other concerning symptoms should be medically assessed.

Why Does My Knee Still Feel Unstable?

A feeling of instability may have several contributors.

These can include:

• ACL deficiency
• Associated ligament injury
• Muscle weakness
• Reduced confidence
• Difficulty with demanding single-leg or pivoting activities

True episodes of the knee giving way are particularly important to discuss with your physiotherapist or physician.

Repeated instability may influence treatment decisions, especially for people returning to pivoting sports or physically demanding activities.

Why Am I Afraid to Trust My Knee?

Fear and reduced confidence are common during ACL rehabilitation.

Physical recovery and psychological readiness do not always progress at exactly the same rate.

A person may have regained substantial strength but still feel hesitant about:

• Running
• Jumping
• Landing
• Pivoting
• Contact
• Returning to competition

Progressively exposing the athlete to increasingly demanding activities can help rebuild confidence.

Psychological readiness should be considered alongside physical testing when planning return to sport.

When Can I Start Running After ACL Reconstruction?

There is no single running date appropriate for everyone.

Running progression should consider surgical healing as well as factors such as:

• Swelling
• Knee movement
• Quadriceps strength
• Single-leg function
• Impact tolerance
• Overall rehabilitation progress

Your surgeon’s protocol and individual surgical considerations may also influence timing.

Once appropriate, running can be introduced gradually through a structured progression.

When Can I Return to Sport After ACL Reconstruction?

Return to sport after ACL reconstruction commonly requires many months of rehabilitation, particularly for sports involving jumping, cutting and pivoting.

Time is important because the reconstructed ligament and surrounding tissues require biological recovery.

However, time alone is not enough.

Return-to-sport decisions should also consider:

• Strength
• Functional testing
• Running capacity
• Jumping and hopping
• Change-of-direction ability
• Sport-specific conditioning
• Knee symptoms
• Confidence
• Psychological readiness
• Surgeon recommendations

The appropriate timeline depends on the individual, surgical procedure and demands of the sport.

Do I Need an MRI for an ACL Injury?

An MRI may help confirm an ACL injury and identify associated injuries involving structures such as the meniscus, cartilage or other ligaments.

However, ACL assessment also includes the history of the injury and clinical examination.

After significant knee trauma, your physician may determine whether X-ray, MRI or other medical assessment is appropriate.

When Should an ACL Injury Be Medically Assessed?

A significant traumatic knee injury should be medically assessed when appropriate, particularly if you experience:

• Inability to bear weight
• Significant or rapidly increasing swelling
• A locked knee
• Inability to fully straighten the knee
• Obvious deformity
• Repeated giving way
• Significant instability
• Severe pain
• New numbness or neurological symptoms

After surgery, contact your surgical team or seek medical assessment for concerning symptoms such as:

• Increasing redness, warmth or drainage around the incision
• Fever or feeling significantly unwell
• Sudden or severe increase in pain or swelling
• New calf swelling or pain
• Sudden shortness of breath or chest pain

Follow the specific post-operative instructions provided by your surgeon.

What if My Knee Pain Is Not From an ACL Injury?

Knee pain can have many causes.

If your primary problem is general knee pain or osteoarthritis rather than an ACL injury, visit our Knee Pain & Arthritis Physiotherapy page.

[Internal link: Knee Pain & Arthritis Physiotherapy]

Pain around or behind the kneecap during stairs, squatting, running or prolonged sitting may have a different presentation, such as patellofemoral pain.

[Internal link: Patellofemoral Pain Physiotherapy — once #23 is finalized]

ACL Rehabilitation for Athletes and Active Adults

Returning to sport requires more than restoring knee movement.

Later-stage rehabilitation may progressively address the demands of your activity, including:

• Strength
• Running
• Acceleration and deceleration
• Jumping
• Landing
• Agility
• Cutting and pivoting
• Fatigue
• Sport-specific drills

An athlete returning to soccer may require a different rehabilitation progression from someone returning to skiing, tennis, basketball or recreational running.

For broader sport-specific rehabilitation, patients may also be directed to our Sports Injury Physiotherapy service.

Sports Injury Physiotherapy

ACL Injury & Reconstruction Physiotherapy at Physiomobility

At Physiomobility Health Group in CF Shops at Don Mills, ACL rehabilitation is centred on physiotherapy and progressive exercise.

We work with people who are:

• Recovering from a recent ACL injury
• Managing an ACL tear without surgery
• Preparing for ACL reconstruction
• Recovering after ACL reconstruction
• Returning to running
• Returning to recreational activity
• Preparing to return to competitive sport

Your rehabilitation may include:

• Knee mobility
• Progressive strengthening
• Walking rehabilitation
• Single-leg exercise
• Balance and coordination
• Cardiovascular conditioning
• Running progression
• Jumping and landing
• Agility
• Sport-specific rehabilitation
• Return-to-sport assessment

Patients can also use Physiomobility’s Knee Exercise Video Library to support exercises selected for their individual rehabilitation program.

Physiomobility is a multidisciplinary clinic, and other services may complement care when appropriate. For ACL injury and ACL reconstruction, physiotherapy, progressive strengthening, functional rehabilitation and appropriate return-to-activity progression remain central to our approach.

If you have recently injured your ACL, are deciding between surgical and non-operative management, or want help progressing after ACL reconstruction, our physiotherapists can assess your current function and develop a rehabilitation program based on your stage of recovery and goals.

Physiomobility Health Group
CF Shops at Don Mills
6 Maginn Mews, Suite 211
North York, Ontario M3C 0G9

Book an ACL Physiotherapy Assessment