Medial patellofemoral ligament (MPFL) reconstruction is a proven surgical solution for those experiencing recurrent kneecap (patellar) instability. While the vast majority of patients experience restored stability and a return to active lifestyles, a small number may face complications or failure after surgery. But how can you easily tell if your MPFL reconstruction failed?
Quick Summary
A failed MPFL reconstruction typically presents as recurrent kneecap dislocation or subluxation, persistent anterior knee pain, loss of range of motion, or no functional progress in physical therapy. Failure rates remain low when surgery is performed by an experienced surgeon and unaddressed anatomical factors — patella alta, trochlear dysplasia, or limb malalignment — are corrected. Early evaluation with X-ray and MRI is essential to identify the cause and determine whether revision surgery is warranted.
Recognizing the signs of a failed MPFL reconstruction early can help ensure the best outcome possible. For in-depth information about MPFL surgery and recovery, read this comprehensive overview: MPFL Reconstruction Surgery.
What Is Considered a Failed MPFL Reconstruction?
A failed MPFL reconstruction is one that does not restore stable, pain-free patellar tracking — usually defined by recurrent dislocation, persistent anterior knee pain, stiffness, or postoperative complications that limit a patient’s return to activity. Surgeons typically diagnose failure by combining the patient’s reported symptoms with a physical exam, X-ray imaging, and MRI to evaluate graft integrity, bone alignment, and soft-tissue changes.
A failed MPFL reconstruction is generally defined by:
- Persistent or recurrent patellar instability: This includes continued episodes where the kneecap dislocates or feels like it may “give way,” especially during twisting movements, sports, or daily activities.
- Disabling anterior knee pain: Ongoing pain at the front of the knee that significantly limits your function or activity.
- Stiffness and loss of range of motion: Difficulty straightening or bending the knee, which may require more aggressive physical therapy or even surgical intervention.
- Postoperative complications: Infection, ongoing swelling, or abnormal wound healing that affects recovery and function.
Signs Your MPFL Reconstruction May Have Failed
The clearest signs of a failed MPFL reconstruction are recurring kneecap dislocation or subluxation, persistent anterior knee pain, new or worsening loss of range of motion, unresolved swelling, and the absence of functional progress in physical therapy. Any of these warrants a focused orthopedic re-evaluation rather than waiting to “push through.”
Consider speaking with your orthopedic team if you experience any of the following after MPFL reconstruction:
- Recurring Instability: If your kneecap continues to dislocate, sublux (shift partially out of place), or feels unstable, particularly during motion or athletic activity.
- Persistent Pain: Ongoing, moderate to severe pain at the front or inner side of the knee, especially if it is similar to or worse than before the surgery.
- Loss of Range of Motion: You notice new or worsening stiffness, inability to extend or flex the knee, or “catching” sensations that restrict movement.
- Swelling or Heat: Swelling or warmth around the knee joint that does not improve with time.
- No Functional Improvement: Lack of progress in physical therapy, difficulty returning to normal activities, or regression post-surgery.
If you’ve had MPFL reconstruction and notice a return or worsening of instability, pain, or stiffness, don’t hesitate to seek an evaluation. Early intervention can often make a great difference in your outcome.
What Causes MPFL Reconstruction to Fail?
MPFL reconstruction most often fails because of unaddressed underlying anatomy — not because the ligament repair itself was performed incorrectly. Patella alta, trochlear dysplasia, an elevated tibial tubercle–trochlear groove (TT–TG) distance, or generalized ligamentous laxity can all overload the new ligament. Technical factors at surgery (graft tunnel placement, tensioning), graft healing, and infection are the other recognized causes.
According to clinical experience and recent studies, failure may be attributed to:
- Technical factors: Incorrect placement or tensioning of the reconstructed ligament during surgery.
- Unaddressed anatomical factors: Such as patella alta (high-riding kneecap), trochlear dysplasia (shallow groove at the femur), or limb alignment issues.
- Graft problems: Stretching or tearing of the new ligament.
- Poor healing or infection: Delayed wound healing, infection, or scar tissue formation.
- Unrecognized risk factors: Generalized ligament laxity may predispose to recurrent instability.
MPFL Reconstruction Failed: Now What?
If you suspect failure, the immediate next step is a clinical and imaging re-evaluation by an experienced patellofemoral surgeon — not a wait-and-see approach. Identifying the specific cause (anatomic, technical, or healing-related) is what determines whether the right answer is targeted rehabilitation, a TT osteotomy, a revision MPFL, or a combined procedure.
If you suspect your MPFL reconstruction has failed:
- Consult your orthopedic surgeon. A thorough history, exam, and imaging (X-rays, MRI) are often required to precisely define the cause of failure, including evaluation of graft integrity and bone structure.
- Do not delay evaluation. Persistent pain or instability could lead to additional problems if not promptly addressed.
- Consider a second opinion. If symptoms are unexplained or persist despite treatment, specialized assessment may be necessary.
- Revision surgery can often address persistent problems, but outcomes depend on finding and correcting the underlying cause(s).
How to Recognize Success (and When to Get Help)
First and foremost, don’t worry: most patients experience excellent outcomes after MPFL reconstruction if performed by an experienced surgeon and followed by proper rehabilitation. However, recognizing early warning signs of a failed MPFL reconstruction can help ensure that you manage any setbacks promptly, maximizing your chance of a full and lasting recovery.
Key Takeaways
- Recurring dislocation, persistent pain, or stalled rehab progress are the most reliable signs of failure.
- Most failures trace back to unaddressed anatomy — not the ligament reconstruction itself.
- Imaging (X-ray and MRI) plus an experienced specialist evaluation is the diagnostic standard before considering revision surgery.
Learn more about MPFL reconstruction, including how to ensure the best possible outcome following surgery. If you’d like to make an appointment for a second opinion, please reach out.
Photo by yury kirillov on Unsplash
Frequently Asked Questions
How common is MPFL reconstruction failure?
Reported failure rates after primary MPFL reconstruction are generally low, typically in the single digits in published series, when surgery is performed by an experienced surgeon and predisposing anatomy (patella alta, trochlear dysplasia, elevated TT–TG distance) is identified and addressed. Higher failure rates are reported when underlying anatomy is left untreated.
How soon after surgery can MPFL reconstruction be considered to have failed?
A clear redislocation during routine activity, ongoing locking or giving-way after the initial healing window, or stalled progress in physical therapy beyond the expected recovery curve all warrant re-evaluation. Some patients have post-op pain or stiffness early on that improves with rehab; ongoing or recurring instability is the most concerning sign and should not be dismissed.
What imaging is needed to diagnose a failed MPFL reconstruction?
A focused workup typically includes weight-bearing X-rays to assess patellar height, alignment, and tunnel position, plus MRI to evaluate graft integrity, cartilage status, and any associated lesions. CT may be added to measure tibial tubercle–trochlear groove (TT–TG) distance or to plan a revision when bony anatomy needs to be corrected.
Is revision MPFL surgery successful?
Outcomes after revision MPFL reconstruction are generally good when the cause of the original failure is correctly identified and addressed — this often means combining a revision MPFL with a tibial tubercle osteotomy, trochleoplasty, or correction of limb malalignment. Outcomes are less predictable when anatomic risk factors are still left untreated, which is why a thorough patellofemoral workup matters.
When should I get a second opinion on a possible failed MPFL reconstruction?
A second opinion is reasonable any time symptoms of instability or pain return, progress in supervised physical therapy stalls, or the cause of ongoing problems has not been clearly explained. A patellofemoral specialist who routinely treats recurrent instability can review prior imaging, examine the knee, and lay out the realistic options — including non-operative paths.
