Arthroscopic ligament reconstruction is a minimally invasive operation used to restore stability to a knee when an important ligament has been severely damaged and is unlikely to function properly with non-surgical treatment alone.

The procedure is most commonly performed for anterior cruciate ligament (ACL) injuries and, in selected patients, for posterior cruciate ligament (PCL) injuries.

During surgery, the damaged ligament is replaced with a strong tendon graft. The operation is performed using a camera inserted through small openings around the knee.

The aim is to restore knee stability, improve function and allow a safe return to daily activities and, when appropriate, sports.

Why might I need ligament reconstruction?

A torn knee ligament does not always require surgery.

Some patients recover well with rehabilitation and are able to return to their normal activities without reconstruction.

Surgery may be considered when:

• The knee continues to feel unstable

• The ligament is completely torn and is unlikely to heal adequately

• Instability interferes with work, daily activities or sports

• You want to return to activities that require a stable knee

• There are associated injuries to other structures in the knee

• Repeated episodes of instability are putting the knee at risk of further damage

The decision depends on the type of injury, your symptoms, activity level and the overall condition of your knee.

Which knee ligaments can be reconstructed?

The ACL is the ligament most commonly reconstructed using arthroscopic surgery.

The PCL can also be reconstructed in selected patients with significant instability.

Injuries to other knee ligaments, such as the medial collateral ligament (MCL) and lateral collateral ligament (LCL), are managed differently depending on the type and severity of the injury. Many of these injuries can heal without reconstruction.

Your surgeon will determine which treatment is appropriate based on the particular ligament injury.

What is arthroscopic surgery?

Arthroscopy means that a small camera is inserted into the knee through a small opening.

The camera allows the surgeon to see the inside of the knee on a monitor. Other small instruments are introduced through additional openings to perform the procedure.

This allows the surgery to be performed through small incisions rather than one large opening.

The surgeon can also examine other parts of the knee and treat associated problems, such as certain meniscus injuries, when appropriate.

What happens during ligament reconstruction?

The damaged ligament is replaced with a tendon graft that acts as a new ligament.

The graft may be taken from your own body or, in selected circumstances, from donated tissue.

The graft is positioned inside the knee and securely fixed so that it can gradually become incorporated into the body and function as a new ligament.

The exact surgical technique depends on which ligament is being reconstructed and your individual knee.

What is a graft?

A graft is a piece of strong tendon used to create the new ligament.

For ACL reconstruction, commonly used grafts include tendons from around the knee or the hamstring.

The choice of graft depends on several factors, including your age, activity level, sport, occupation, previous surgery and the condition of your knee.

There is no single graft that is best for every patient.

Will my torn ligament be repaired or replaced?

This depends on the type of injury.

In many complete ACL tears, the damaged ligament is replaced with a tendon graft because the original ligament has limited ability to heal in its normal position.

However, selected ACL injuries, particularly certain tears where the ligament has pulled away from its attachment, may be suitable for repair or fixation rather than reconstruction.

Your surgeon will assess the location and pattern of the injury before deciding which approach is appropriate.

How is the new ligament fixed in place?

The tendon graft is securely fixed inside the bone tunnels so that it remains in the correct position while it heals and becomes firmly attached. Different fixation methods may be used depending on the type of reconstruction and the graft being used. For ACL reconstruction, fixation may include a small button on the thigh-bone side (such as a loop Endobutton) and an interference screw on the shin-bone side. Your surgeon will choose the fixation method that is most appropriate for your knee.

What are the benefits of ligament reconstruction?

The main aim of reconstruction is to provide a stable and functional knee.

Successful reconstruction can help:

• Reduce episodes of the knee giving way

• Improve confidence during walking and physical activity

• Allow a return to many everyday activities

• Help patients return to sports when appropriate

• Reduce the risk of further injury caused by repeated instability

• Treat associated injuries at the same time when necessary

The goal is not simply to reconstruct a ligament seen on an MRI. The goal is to restore useful knee function and stability.

Do I need surgery immediately after a ligament tear?

Not always.

The timing of surgery depends on the type of injury, your symptoms, associated injuries and the condition of the knee.

For many ACL injuries, it is beneficial to first reduce swelling and regain as much knee movement and muscle control as possible.

This may involve a period of physiotherapy before surgery.

In some situations, surgery may be performed earlier, particularly when there are associated injuries or other reasons to proceed without delay.

Your surgeon will recommend the timing that is most appropriate for your knee.

What should I expect after surgery?

Recovery is a gradual process.

You will usually begin moving the knee and walking soon after surgery, according to the procedure performed and your surgeon's advice.

Physiotherapy is an important part of recovery and focuses on:

• Reducing swelling

• Regaining knee movement

• Restoring muscle strength

• Improving balance and control

• Gradually increasing activity

The rehabilitation programme is just as important as the surgery for achieving a good functional result.

How painful is ligament reconstruction?

Some pain and swelling are expected during the early recovery period.

Modern pain-management methods help control discomfort and allow you to begin moving the knee early.

Pain usually improves progressively as the knee heals.

The amount of pain and the speed of recovery vary between patients.

When can I walk after ligament reconstruction?

Most patients are able to stand and walk with support soon after surgery, although the amount of weight that can be placed on the leg depends on the ligament reconstructed and any additional procedures performed.

A walker or crutches may be required initially.

As strength and control improve, walking support can gradually be reduced.

When can I return to work?

This depends on your occupation and the type of reconstruction performed.

People with desk-based work may return relatively early, while jobs involving prolonged standing, climbing, lifting or physical activity may require more time.

Your return to work should be gradual and based on your recovery.

A probable timeline of rehabilitation for ACL injuries and PCL injuries have been discussed in their specific sections.

When can I return to sports?

Returning to sports requires more than simply being free of pain.

Before returning to demanding sports, you should have recovered adequate:

• Knee movement

• Muscle strength

• Balance

• Coordination

• Confidence

• Control of the operated leg

The timing varies considerably between patients and depends on the ligament reconstructed and the sport involved.

For sports involving running, jumping, sudden changes of direction or contact, return is usually considerably later than return to normal walking and everyday activities.

A structured rehabilitation programme and functional assessment help guide a safe return to sport.

A probable timeline of rehabilitation for ACL injuries and PCL injuries have been discussed in their specific sections.

Will my knee become completely normal after reconstruction?

The aim is to restore a stable, functional and pain-free or substantially less painful knee, but recovery is not identical for everyone.

Many patients return to normal daily activities and a high level of physical activity after successful reconstruction.

The final outcome depends on several factors, including the original injury, associated damage, surgical technique, rehabilitation and the patient's commitment to recovery.

What are the risks of ligament reconstruction?

Arthroscopic ligament reconstruction is a well-established procedure with good outcomes in appropriately selected patients.

As with any surgery, complications can occur. These may include:

• Infection

• Blood clots

• Bleeding

• Knee stiffness

• Persistent pain or swelling

• Numbness around the surgical area

• Continued instability

• Graft failure or stretching

• Need for further surgery

Your surgeon will discuss the risks relevant to your particular injury and health before surgery.

Can the reconstructed ligament tear again?

Yes, but this is not common.

A reconstructed ligament can be injured again, particularly during sports or activities involving sudden twisting or changes of direction.

Good rehabilitation, appropriate strengthening and a gradual return to sports can help reduce the risk of reinjury.

For younger and highly active patients, injury to the opposite knee can also occur, which is why prevention and neuromuscular training remain important even after successful reconstruction.

Will I need physiotherapy after surgery?

Yes.

Physiotherapy is an essential part of recovery.

Surgery restores the structural stability of the knee, but rehabilitation helps you regain the strength, movement, balance and control needed to use the knee normally.

Your rehabilitation programme will progress gradually according to your recovery.

When should I consider ligament reconstruction?

You may benefit from reconstruction if you have a confirmed ligament injury and:

• Your knee repeatedly gives way

• Instability is affecting your daily activities or sports

• You want to return to activities that require a stable knee

• Associated injuries require surgical treatment

• Non-surgical treatment has not provided adequate stability

However, not every ligament tear requires reconstruction.

A proper clinical examination, imaging and discussion of your activity requirements are important before making the decision.

Frequently Asked Questions

Can a completely torn ACL heal without surgery?

A completely torn ACL has limited ability to heal in its normal position.

However, not every patient with a complete ACL tear needs reconstruction. Some people can function well with rehabilitation and activity modification, particularly if they do not experience instability and do not participate in activities that place high demands on the ACL.

The decision should be based on how your knee functions and what you want to do with it, rather than the MRI alone.

Is ACL reconstruction the same as ACL repair?

No.

In reconstruction, the damaged ACL is replaced with a tendon graft.

In selected injuries where the ACL has pulled away from its attachment and the tissue is suitable, ACL repair or avulsion fixation may be possible.

The location and pattern of the tear determine which procedure is appropriate.

Can ligament reconstruction be done together with meniscus surgery?

Yes.

ACL or PCL injuries may occur together with meniscus injuries or other damage inside the knee.

When appropriate, these problems can often be treated during the same arthroscopic procedure.

Can I return to sports after ligament reconstruction?

Yes, many patients can.

The timing depends on the ligament reconstructed, associated injuries, recovery of strength and function, and the demands of your sport.

A gradual and structured return to sport is important rather than returning simply because the knee feels better.

What happens if I do not have ligament reconstruction?

Some patients can live normally without reconstruction, particularly if the knee is stable and they are able to modify their activities.

However, repeated episodes of instability can cause further damage to structures such as the meniscus and cartilage.

If your knee repeatedly gives way or prevents you from doing the activities you want, reconstruction may be worth considering.