Knee stability is essential for confident movement — whether you’re walking, climbing stairs, or returning to sports. But for many people, recurrent knee dislocations become a frustrating and painful problem that affects daily life. One of the key reasons behind these repeated dislocations is an injury to a structure called the Medial Patellofemoral Ligament (MPFL).
In this blog, we’ll explain what the MPFL does, why it matters, how an MPFL tear leads to instability, and how MPFL reconstruction surgery helps prevent recurrent knee dislocations.
Understanding the MPFL: The Natural Restraint of the Kneecap
The Medial Patellofemoral Ligament (MPFL) is a strong band of tissue that connects the inner side of the kneecap (patella) to the thigh bone (femur). Its main function is to prevent the kneecap from sliding or dislocating outward when the knee bends or straightens.
Think of it as a safety strap that keeps the patella aligned in its groove — the trochlear groove — as your knee moves.
When the MPFL is healthy, the kneecap glides smoothly in this groove. However, when the ligament is torn or stretched, it loses its ability to stabilize the patella. This makes the knee prone to repeated patellar dislocations, even during simple movements like sitting, squatting, or getting up from a chair.
What Happens During a Knee Dislocation?
A knee (patellar) dislocation occurs when the kneecap slips out of its normal track, usually to the outer (lateral) side of the knee. It often happens during a sudden twisting motion or a direct impact on the knee.
Common scenarios include:
A sports injury involving a sudden change in direction
A fall or misstep while walking
A blow to the knee during contact sports
When this happens for the first time, the MPFL often tears or stretches as it tries to prevent the patella from moving too far. This is known as an MPFL tear.
If the ligament is not properly healed or repaired, it can lead to chronic instability, where the kneecap keeps slipping out repeatedly — a condition known as recurrent patellar dislocation.
Signs and Symptoms of an MPFL Tear
Patients with an MPFL tear or recurrent knee dislocation often report:
A visible or felt dislocation of the kneecap
Pain and swelling around the front of the knee
A feeling of the knee “giving way” during movement
Difficulty in fully bending or straightening the knee
Fear or insecurity while walking on uneven surfaces or playing sports
In some cases, patients also develop cartilage injuries around the patella due to repeated dislocations, which can lead to long-term pain and arthritis if left untreated.
Diagnosis: How Do We Identify an MPFL Tear?
Accurate diagnosis is essential for proper treatment. Your orthopedic surgeon will:
Take a detailed history — asking about how the dislocation happened and whether it has recurred.
Perform a physical examination — checking for tenderness, laxity, and how easily the patella moves out of place.
Order imaging tests:
X-rays to rule out bone fractures
MRI scan to visualize the MPFL and check for associated cartilage or bone injuries
An MRI is the most reliable way to confirm an MPFL tear and assess its severity.
When Is MPFL Surgery Needed?
After a first-time dislocation, conservative treatment such as rest, bracing, and physiotherapy may be sufficient if the knee is stable and the MPFL is only partially injured.
However, MPFL reconstruction surgery becomes necessary when:
The patient has recurrent knee dislocations
There is a complete MPFL tear
There is significant instability or fear of dislocation
Non-surgical methods have failed to restore stability
For young, active individuals or athletes, MPFL surgery is often the best long-term solution to prevent further episodes and protect the knee joint from damage.
What Is MPFL Reconstruction Surgery?
MPFL reconstruction is a minimally invasive arthroscopic surgery that aims to restore the stability of the kneecap by recreating the torn ligament.
Here’s how it works:
The procedure is typically performed under regional anaesthesia and takes about 60–90 minutes.
Benefits of MPFL Reconstruction Surgery
The goal of MPFL reconstruction is not just to repair the ligament but to restore confidence and function.
Here are the major benefits:
1.Prevents Recurrent Dislocations
By restoring the natural restraint of the kneecap, MPFL surgery prevents the patella from sliding out again. This dramatically reduces the risk of further dislocations.
2.Improves Knee Stability
Patients often describe a feeling of “looseness” or “giving way” after a dislocation. Post-surgery, the knee feels more stable, even during high-impact activities.
3. Restores Normal Knee Function
Once the kneecap tracks properly, patients regain their ability to walk, climb stairs, and squat comfortably without fear.
4. Prevents Cartilage Damage
Recurrent dislocations can damage the cartilage on the underside of the patella and femoral groove. Early MPFL reconstruction helps protect this cartilage and reduces the risk of arthritis later in life.
5. Helps Athletes Return to Sports
For athletes, this surgery is often the turning point that allows them to safely return to their previous level of performance with reduced risk of re-injury.
Recovery After MPFL Surgery
Recovery after MPFL reconstruction follows a structured rehabilitation program to ensure proper healing and regain strength.
Your surgeon and physiotherapist will guide you at each stage to ensure safe recovery and avoid stiffness or re-injury.
Success Rate of MPFL Reconstruction
Modern MPFL reconstruction techniques have a success rate of over 95% in preventing recurrent knee dislocation.
Patients typically report:
Excellent stability
Improved function
Minimal recurrence
High satisfaction levels
Long-term results show that early surgical intervention not only restores stability but also prevents further cartilage wear and tear.
When Should You See a Doctor?
If you’ve experienced knee dislocation even once — and especially if it happens repeatedly — it’s important to get evaluated by a sports injury specialist or arthroscopic knee surgeon.
Delaying treatment can lead to chronic instability and early arthritis.
Conclusion: A Stable Knee, a Confident You
An MPFL tear is more than just a ligament injury — it’s a cause of repeated pain, instability, and loss of confidence.
With advanced arthroscopic MPFL reconstruction surgery, patients can finally break the cycle of recurrent dislocations and get back to active, pain-free living.
If you or someone you know is struggling with repeated knee dislocations, consult an expert in MPFL surgery to discuss the best treatment options.
With precise diagnosis, skilled reconstruction, and guided rehabilitation, your knee can regain its natural stability — and you can regain your freedom of movement.
