Can an Untreated Sprained Ankle Cause Chronic Ankle Instability?

You may roll your ankle, experience some pain and swelling, and assume that the injury will heal on its own. A few days later, you might be walking again, so the problem seems to be over. But what happens if the ankle still feels weak, keeps rolling or suddenly gives way months after the original injury? This can lead to an important question: can an untreated sprained ankle cause chronic ankle instability?

In some people, a poorly healed or inadequately rehabilitated ankle sprain may contribute to ongoing instability. The ankle may not regain its previous strength, balance or sense of control, increasing the chance of repeated sprains and episodes where the joint feels as though it is “giving way.”

Not every untreated ankle sprain leads to chronic ankle instability. Many mild sprains improve without long-term problems. However, ignoring persistent symptoms or returning to normal activity before the ankle has recovered may increase the risk of ongoing difficulties.

Can an Untreated Sprained Ankle Cause Chronic Ankle Instability?

Yes, it can contribute to chronic ankle instability in some cases.

An ankle sprain commonly occurs when the ligaments supporting the joint are stretched or torn. If the ankle does not recover fully, the structures responsible for supporting and controlling the joint may remain weaker or less effective.

Chronic ankle instability can develop when a person experiences ongoing problems such as:

• Repeated ankle sprains
• A feeling that the ankle is weak
• Episodes where the ankle suddenly gives way
• Reduced confidence when walking on uneven surfaces
• Difficulty returning to sport
• Persistent discomfort after activity

The problem is not always simply that the ligaments have failed to heal. Changes in strength, balance, movement control and joint awareness can also play a role.

What Is Chronic Ankle Instability?

Chronic ankle instability is a condition in which the ankle repeatedly feels unstable, particularly after a previous sprain.

People may describe the sensation in different ways:

• “My ankle keeps giving way.”
• “I feel like I could roll it again at any time.”
• “I do not trust my ankle on uneven ground.”
• “My ankle feels weak when I exercise.”
• “It keeps rolling even after the original injury healed.”

The symptoms may be occasional or frequent.

Some people only notice instability during sports. Others may experience it while walking, going downstairs or moving on uneven surfaces.

How Can an Ankle Sprain Lead to Long-Term Instability?

An ankle sprain can affect more than your ability to walk for a few days.

During the injury, ligaments may be stretched or torn. The surrounding muscles and other structures may also be affected.

After the initial pain and swelling improve, several problems can remain.

Reduced Strength

Muscles around the ankle may become weaker if activity is significantly reduced.

Reduced Balance and Coordination

An ankle injury can affect the body’s ability to control the joint during movement.

Poor Recovery of Joint Control

The ankle may not respond as effectively when the foot begins to roll or twist.

Returning to Activity Too Soon

If you resume sport or demanding activity before the ankle is ready, you may increase the risk of another sprain.

Repeated Injuries

Every new injury can further affect ankle function and confidence.

Over time, this cycle may contribute to chronic ankle instability.

What Happens If You Do Not Treat a Sprained Ankle?

Not every sprain requires the same level of treatment.

A mild injury may improve with appropriate self-care and gradual recovery. However, completely ignoring a significant ankle injury can create problems if important symptoms persist.

For example, you might:

• Continue walking with an abnormal gait
• Avoid using the ankle properly because of pain
• Return to sport too early
• Develop weakness after prolonged inactivity
• Experience another sprain before the first injury has recovered

The issue is not always whether you received a specific treatment immediately. Inadequate recovery and rehabilitation can also be important.

An ankle that feels better is not always an ankle that has fully regained its strength and stability.

Can a Sprained Ankle Heal Without Treatment?

Some mild ankle sprains improve with basic care and a gradual return to activity.

However, “healing” should not always mean simply waiting until the pain becomes less noticeable.

A proper recovery may involve allowing symptoms to settle while gradually restoring:

• Movement
• Strength
• Balance
• Stability
• Confidence in the ankle

If the ankle remains painful, unstable or weak, additional assessment may be appropriate.

What Are the Signs of Chronic Ankle Instability?

The symptoms can vary.

Common signs include:

Your Ankle Keeps Giving Way

This is one of the most common complaints.

The ankle may suddenly feel unstable while walking or exercising.

You Keep Spraining the Same Ankle

Repeated sprains may suggest that the ankle has not regained full stability.

You Feel Unstable on Uneven Ground

Walking on grass, gravel or uneven surfaces may feel more difficult.

You Do Not Trust Your Ankle During Exercise

You may feel nervous about running, jumping or changing direction quickly.

The Ankle Feels Weak

Even without severe pain, the ankle may not feel as strong or secure as before.

You Experience Recurrent Swelling or Discomfort

Symptoms may return after increased activity.

If these problems continue after an ankle sprain, a healthcare professional may assess whether chronic ankle instability is involved.

Why Does My Ankle Keep Giving Way After a Sprain?

There are several possible reasons.

The original ligaments may still not provide the same level of support. However, mechanical ligament laxity is not the only possible cause.

The problem may also involve:

• Muscle weakness
• Reduced balance
• Poor coordination
• Reduced proprioception
• Incomplete rehabilitation
• Previous repeated injuries

Proprioception refers to the body’s awareness of where a joint is positioned and how it is moving.

After an injury, this system may not work as effectively. As a result, the body may react more slowly when the ankle begins to roll.

This can increase the chance of another sprain.

Can You Have Chronic Ankle Instability Without Constant Pain?

Yes.

Some people with chronic ankle instability do not experience severe pain every day.

Instead, the main problem may be repeated episodes of instability.

You might walk normally most of the time but suddenly roll the ankle when:

• Stepping off a kerb
• Walking on uneven ground
• Turning quickly
• Playing sport
• Going downstairs

Pain may only return after the ankle gives way again.

This is one reason why the absence of constant pain does not necessarily mean that the ankle has completely recovered.

Can an Untreated Sprained Ankle Cause Repeated Sprains?

It may increase the risk.

If the ankle has not regained normal strength, balance and stability, it may be more vulnerable to another injury.

This can create a frustrating cycle:

Initial ankle sprain → incomplete recovery → instability → repeated sprain → further instability

Breaking this cycle often involves addressing the factors that are contributing to the repeated injuries.

Does Chronic Ankle Instability Get Worse Over Time?

It can persist or become more problematic if the ankle continues to give way repeatedly.

Repeated injuries may place further stress on the ligaments, tendons and other structures around the joint.

However, long-term outcomes vary.

Some people improve with appropriate rehabilitation and changes to their activity.

Others may need further medical assessment if symptoms are severe or do not respond to conservative treatment.

The key point is that persistent instability should not simply be ignored because the original sprain happened months or years ago.

Can Chronic Ankle Instability Cause Other Problems?

Repeated ankle instability may affect more than your confidence while walking.

Depending on the individual, ongoing instability may contribute to:

• Recurrent ankle sprains
• Persistent swelling
• Ongoing pain
• Reduced physical activity
• Changes in walking patterns
• Reduced ability to participate in sport
• Stress on other structures around the ankle

Repeated ankle injuries can also increase the risk of additional damage to the joint.

This does not mean that everyone with chronic ankle instability will develop serious complications, but persistent symptoms should be taken seriously.

Can Chronic Ankle Instability Lead to Arthritis?

Repeated ankle injuries may contribute to changes within the joint over time.

A history of significant trauma to the ankle is one factor that may be associated with post-traumatic osteoarthritis.

However, chronic ankle instability does not automatically mean that arthritis will develop.

Your individual risk can depend on factors such as:

• The severity of the original injury
• Repeated trauma
• Damage to joint structures
• Previous fractures
• Overall joint health

If you experience persistent pain, stiffness or swelling years after an ankle injury, a healthcare professional can help determine the cause.

How Is Chronic Ankle Instability Diagnosed?

A healthcare professional may ask questions about:

• Previous ankle sprains
• How the original injury happened
• How often the ankle gives way
• Whether you experience pain or swelling
• Your activity level
• Your work and sports requirements

They may also assess:

• Ankle stability
• Strength
• Range of movement
• Balance
• Walking pattern

Further investigations may be considered depending on the symptoms.

The purpose is to determine whether your symptoms are related to chronic ankle instability or another problem.

What Happens If You Keep Ignoring an Unstable Ankle?

Ignoring persistent instability can make it easier to fall into the repeated-injury cycle.

You may keep adjusting your movement to avoid rolling the ankle.

You may stop exercising because you no longer trust the joint.

Or you may repeatedly push through symptoms until another sprain occurs.

The longer the problem continues, the more difficult it may feel to return to your previous level of activity.

If the ankle repeatedly gives way, it is worth seeking advice rather than simply accepting it as normal after an old injury.

Can You Treat Chronic Ankle Instability Without Surgery?

In many cases, conservative approaches may be considered first.

The exact treatment depends on the cause and severity of the instability.

A recovery plan may focus on:

• Improving ankle strength
• Balance exercises
• Proprioception training
• Restoring normal movement
• Gradually returning to activity
• Improving overall ankle control

Some people may also be advised to use an ankle brace or other support for certain activities.

Surgery may be considered in selected cases, particularly when significant instability continues despite appropriate non-surgical management.

A healthcare professional can explain which approach is appropriate for your situation.

Why Is Rehabilitation Important After a Sprained Ankle?

The first goal after a sprain is often to reduce pain and swelling.

However, recovery should not always stop once these symptoms improve.

Rehabilitation can help restore:

• Strength
• Mobility
• Balance
• Coordination
• Joint awareness
• Confidence during movement

For someone who has had a severe sprain or repeated injuries, this may be particularly important.

A gradual approach can help the ankle adapt to increasing activity.

Can You Exercise With Chronic Ankle Instability?

Some forms of exercise may still be possible, but the right approach depends on your symptoms.

High-impact activities may be more difficult if the ankle continues to give way.

Before returning to demanding activity, it may be helpful to consider whether you can:

• Walk without significant instability
• Balance confidently
• Change direction safely
• Use the ankle through its normal range
• Exercise without repeated swelling afterwards

A sudden return to intense exercise may increase the chance of another injury.

If instability continues, personalised advice from a healthcare professional or physiotherapist may be helpful.

Can You Work With Chronic Ankle Instability?

It depends on the type of work you do.

Chronic ankle instability may have a greater impact on jobs that involve:

• Long periods of standing
• Frequent walking
• Climbing stairs
• Working on uneven surfaces
• Carrying heavy items
• Repeated physical movement

A desk-based job may be easier to manage, although commuting and moving around the workplace can still be difficult during periods of pain or swelling.

Some people may benefit from temporary workplace adjustments, such as:

• Reduced walking
• More seated tasks
• Modified duties
• Temporary restrictions on physically demanding activities

The appropriate adjustments depend on your individual limitations and medical advice.

When Might You Need a Doctor’s Note for an Ankle Injury?

If an ankle injury affects your ability to attend work or perform your normal duties, your employer or another organisation may ask for appropriate medical documentation.

This can be particularly relevant when instability or repeated ankle injuries make it difficult to:

• Stand for long periods
• Walk safely
• Carry out physical duties
• Participate in required activities

Where documentation is needed, it should be based on an appropriate assessment and accurately reflect your circumstances.

Need Medical Documentation for a Sprained Ankle?

If a sprained ankle has affected your ability to work or carry out normal responsibilities, you can explore our Doctor’s Note for Sprained Ankle page for more information.

Frequently Asked Questions

Can an untreated sprained ankle cause chronic ankle instability?

Yes, inadequate recovery or rehabilitation after an ankle sprain may contribute to chronic ankle instability. This can cause repeated sprains and episodes where the ankle feels as though it is giving way.

How do you know if you have chronic ankle instability?

Common signs include repeated ankle sprains, frequent episodes of the ankle giving way, instability on uneven surfaces and ongoing weakness or lack of confidence in the joint.

Can a sprained ankle cause permanent instability?

Some people may experience long-term instability after an ankle sprain, particularly if the injury was severe or the ankle did not fully recover. Appropriate rehabilitation may help improve stability.

Can chronic ankle instability get worse?

It can remain problematic if repeated ankle injuries continue. Each new injury may further affect the stability and function of the joint.

Can chronic ankle instability cause arthritis?

Repeated ankle trauma may contribute to long-term joint problems, including post-traumatic osteoarthritis in some people. However, chronic ankle instability does not automatically cause arthritis.

Can you walk with chronic ankle instability?

Yes, many people can walk with chronic ankle instability. The main difficulty may occur during activities that require quick changes in direction or when walking on uneven surfaces.

Do you need a Doctor’s Note for Sprained Ankle if instability affects work?

You may need appropriate medical documentation if an ankle injury affects your ability to work and your employer or another organisation requires evidence of your limitations.

Final Thoughts

Can an untreated sprained ankle cause chronic ankle instability? In some people, inadequate recovery after an ankle injury may contribute to ongoing weakness, repeated sprains and a persistent feeling that the ankle is not stable.

A sprained ankle should not automatically be considered fully recovered just because the initial swelling has gone down. If your ankle repeatedly gives way, feels weak or continues to limit your daily activities, the original injury may need further assessment.

Early attention to strength, balance, movement and stability may help reduce the risk of repeated injuries. And if an ankle problem affects your ability to work or carry out normal responsibilities, appropriate medical documentation may help explain the situation when it is required.