5 Signs You May Need ACL Reconstruction

Asian woman runner holding her sports injured leg

Torn your ACL or think you might have? Whether you’re an athlete or simply someone who enjoys an active lifestyle, a damaged ACL can hold you back in more ways than one.

The good news is that with ACL reconstruction surgery, you don’t have to settle for limited mobility forever. In this article, we’ll cover the signs that warrant treatment, so you can take charge of your health sooner rather than later. But, first, let’s take a look at just what the ACL and when it’s prone to tearing.

What Is the ACL and When Does it Tear?

The anterior cruciate ligament (ACL) is one of the key ligaments that helps stabilise your knee. It connects your thighbone (femur) to your shinbone (tibia) and is vital for controlling forward movement and rotation of the knee joint.

ACL injuries are prevalent in sports that involve sudden stops, changes in direction, or awkward landings—think football, basketball, skiing, and even recreational running. That’s why athletes and active individuals are at the highest risk.

However, you don’t have to be a sports professional to experience an ACL tear; it can occur during any vigorous activity or even a misstep during your daily routine.

Sign #1: You Heard a 'Pop' at the Time of Injury

If you felt or heard a distinct “pop” in your knee during activity, that could be your ACL speaking loud and clear. Many patients recall a snapping or popping sound at the exact moment the injury occurred. It’s often followed by immediate pain, swelling, or an unsettling feeling that something isn’t quite right.

This audible “pop” is one of the recognisable signs of an ACL tear, and it should not be brushed off. Ignoring this red flag may delay recovery and worsen the joint damage over time.

Sign #2: Ongoing Knee Instability or 'Giving Way'

One of the most frustrating symptoms of an ACL injury is instability. You may feel like your knee buckles, gives out, or shifts out of place, especially when pivoting, running, or going downhill.

That shaky, unreliable feeling can impact your participation in sports and make everyday movements, such as walking or climbing stairs difficult. If your knee doesn’t feel “secure,” it’s time to get it checked.

Sign #3: Persistent Swelling and Stiffness

A slight swelling after a knock is normal. But if the swelling continues for days or keeps coming back, it could be a sign of deeper structural damage within the joint.

A torn ACL often leads to internal bleeding in the knee, causing inflammation, stiffness, and a limited range of motion. This swelling may prevent you from bending or straightening your knee fully, and in some cases, it can interfere with walking altogether.

Sign #4: Trouble Returning to Sports or Training

Tried to get back to your regular workout or training routine, but your knee won’t cooperate? That’s common with an ACL injury. Many people with ACL injuries can’t handle the intensity of sports, especially those involving quick turns or sudden movements.

You may even start compensating with other muscles, which can lead to further injuries in your hips, back, or opposite leg.

Sign #5: You've Lost Confidence in Your Knee During Movement

Sometimes, the hardest part of an ACL injury isn’t physical—it’s mental. You might hesitate to run, pivot, or even walk briskly out of fear that your knee will give out again. This loss of confidence can be just as limiting as pain or swelling.

If you’re constantly second-guessing your movements, avoiding stairs or uneven ground, or steering clear of sports you once loved, it may be time to consider reconstructive treatment.

What ACL Reconstruction Involves (and Why It's Worth It)

ACL reconstruction is a surgery to restore the stability of your knee by replacing the torn ligament with a graft, either from your own tissue or a donor. At ALPS Orthopaedic, our specialists utilise minimally invasive techniques and customise treatment plans to each patient’s individual goals.

Most patients begin rehabilitation immediately after surgery, start walking with support within days, and progress to training within a few months.

Returning to Sports and Hobbies

ACL reconstruction can help you get your life back. Whether you’re aiming to return to soccer, basketball, or more demanding activities like skiing and snowboarding, your recovery will require patience, consistent physical therapy, and a close partnership with your care team.

To make a successful return, you’ll need to commit to three key areas:

  • Stick to your rehab plan: Your physiotherapist will guide you through exercises that rebuild muscle strength and restore your knee’s range of motion.
  • Fuel your body: A balanced diet rich in vitamins and protein supports tissue repair and promotes muscle growth.
  • Follow your surgeon’s instructions: From managing swelling to pacing your activity level, these personalised guidelines help you heal safely and reduce the risk of setbacks.

With steady effort and realistic expectations, many patients return to their pre-injury activity levels. Still, every recovery journey is unique. Some residual stiffness or limitations may remain but that doesn’t mean your active lifestyle is out of reach. With the right support and mindset, you can come back stronger mentally and physically.

When Can You Return to Sports?

The timeline to return to sports varies, but most patients can expect:

  • Light activity and strengthening: within 6–8 weeks
  • Running and agility drills: around 4–6 months
  • Full return to sport: typically at 9–12 months, depending on progress

Speak to a Specialist About ACL Reconstruction in Singapore

Living with an unstable knee can be frustrating, and waiting too long may reduce your chances of a full recovery. If you suspect an ACL injury or are struggling with any of the signs mentioned above, don’t put off seeking help.

At ALPS Orthopaedic, we will discuss your symptoms, lifestyle and desired activity levels before assessing your suitability for ACL reconstruction surgery. Our team in Singapore will guide you through every step, from treatment to recovery. 

Book a consultation today.

Has this article been insightful? Share it!

Dr Jerry Chen

MBBS (S’pore), MRCSEd, MMed (Ortho), FRCSEd (Ortho)

Fellowship-trained Consultant Orthopaedic Surgeon & Medical Director

Why Alps Orthopaedic Centre?

At Alps Orthopaedic Centre, we specialise in Enhanced Recovery After Surgery (ERAS). Performed as a Day Surgery, the ERAS Direct Anterior Approach in Total Hip Replacement (THR) technique as well as ERAS Total Knee Replacement (TKR), reduces the average hospitalisation stay, utilising techniques which enable the patient to suffer from less pain and recover faster. We are an Orthopaedic clinic in Singapore, which specialises in ERAS and do our utmost to enable patients to return to everyday activities as early as possible. 

Our Orthopaedic clinic provides specialised diagnosis and effective treatment of musculoskeletal problems, especially Day Surgery / Enhanced Recovery After Surgery (ERAS) For Hip and Knee Surgery, Sports Injuries and Trauma Fractures. If you are considering hip or knee surgery or minimally invasive treatments, book an appointment with our experienced Consultant Orthopaedic Surgeon, Dr Jerry Chen, for a thorough assessment and treatment plan. 

Our aim is to boost patient well-being, optimising every aspect of the surgical journey. By minimising the recovery period, patients are able to go back to activities that they love. The Alps team offers comprehensive financial counselling sessions to ensure our patients understand their options and make informed decisions regarding their treatment plans.

Has this article been insightful? Share it!

Dr Jerry Chen

MBBS (S’pore), MRCSEd, MMed (Ortho), FRCSEd (Ortho)

Fellowship-trained Consultant Orthopaedic Surgeon & Medical Director

Why Alps Orthopaedic Centre?

At Alps Orthopaedic Centre, we specialise in Enhanced Recovery After Surgery (ERAS). Performed as a Day Surgery, the ERAS Direct Anterior Approach in Total Hip Replacement (THR) technique as well as ERAS Total Knee Replacement (TKR), reduces the average hospitalisation stay, utilising techniques which enable the patient to suffer from less pain and recover faster. We are an Orthopaedic clinic in Singapore, which specialises in ERAS and do our utmost to enable patients to return to everyday activities as early as possible. 

Our Orthopaedic clinic provides specialised diagnosis and effective treatment of musculoskeletal problems, especially Day Surgery / Enhanced Recovery After Surgery (ERAS) For Hip and Knee Surgery, Sports Injuries and Trauma Fractures. If you are considering hip or knee surgery or minimally invasive treatments, book an appointment with our experienced Consultant Orthopaedic Surgeon, Dr Jerry Chen, for a thorough assessment and treatment plan. 

Our aim is to boost patient well-being, optimising every aspect of the surgical journey. By minimising the recovery period, patients are able to go back to activities that they love. The Alps team offers comprehensive financial counselling sessions to ensure our patients understand their options and make informed decisions regarding their treatment plans.

Has this article been insightful? Share it!

Dr Jerry Chen

MBBS (S’pore), MRCSEd, MMed (Ortho), FRCSEd (Ortho)

Fellowship-trained Senior Consultant Orthopaedic Surgeon & Medical Director

Why Alps Orthopaedic Centre?

At Alps Orthopaedic Centre, we specialise in Enhanced Recovery After Surgery (ERAS). Performed as a Day Surgery, the ERAS Direct Anterior Approach in Total Hip Replacement (THR) technique as well as ERAS Total Knee Replacement (TKR), reduces the average hospitalisation stay, utilising techniques which enable the patient to suffer from less pain and recover faster. We are an Orthopaedic clinic in Singapore, which specialises in ERAS and do our utmost to enable patients to return to everyday activities as early as possible. 

Our Orthopaedic clinic provides specialised diagnosis and effective treatment of musculoskeletal problems, especially Day Surgery / Enhanced Recovery After Surgery (ERAS) For Hip and Knee Surgery, Sports Injuries and Trauma Fractures. If you are considering hip or knee surgery or minimally invasive treatments, book an appointment with our experienced Senior Consultant Orthopaedic Surgeon, Dr Jerry Chen, for a thorough assessment and treatment plan. 

Our aim is to boost patient well-being, optimising every aspect of the surgical journey. By minimising the recovery period, patients are able to go back to activities that they love. The Alps team offers comprehensive financial counselling sessions to ensure our patients understand their options and make informed decisions regarding their treatment plans.