How to Explain Patellar Stabilization Surgery to a Patient
When explaining patellar stabilization surgery to a patient with recurrent patellar instability, start by describing that their kneecap (patella) keeps slipping out of its groove because the ligament that holds it in place (the medial patellofemoral ligament or MPFL) is torn or stretched, and surgery will reconstruct this ligament to prevent future dislocations.
Understanding What's Wrong
Begin by explaining the anatomy in simple terms:
- The kneecap normally sits in a groove at the front of the thighbone and slides up and down when bending the knee
- In their case, the kneecap is unstable and slides out of position (dislocates) because the main stabilizing ligament on the inside of the knee is damaged
- Additional factors may be contributing: the groove may be too shallow (trochlear dysplasia), the kneecap may sit too high (patella alta), or the attachment point of the kneecap tendon may be positioned too far to the outside 1, 2
What the Surgery Involves
The primary procedure is MPFL reconstruction, where surgeons rebuild the damaged ligament using a graft (typically from a hamstring tendon) to restore the natural restraint that keeps the kneecap centered 1, 2, 3.
Depending on their specific anatomy identified on imaging, they may need additional procedures:
Tibial tubercle osteotomy: If the kneecap attachment is positioned too far laterally or if the kneecap sits too high, the surgeon cuts and repositions the bone where the patellar tendon attaches, moving it to a more favorable position 2, 3, 4
Trochleoplasty: If the groove is severely shallow (severe trochlear dysplasia), the surgeon may need to deepen it surgically, though this is reserved for the most severe cases 3, 5
Why Surgery Is Recommended
Explain that with recurrent instability:
- 94% of patients achieve stability after surgery, meaning the kneecap stops dislocating 6
- Without surgery, over 50% of patients continue having dislocations, which can lead to cartilage damage and early arthritis 1
- Each dislocation causes further damage to the cartilage and supporting structures
- Conservative treatment with physical therapy alone has high failure rates when anatomical risk factors are present 2, 7
What to Expect After Surgery
Be transparent about outcomes:
- The surgery will likely prevent future dislocations (94% success rate for stability) 6
- However, approximately 23% of patients remain somewhat dissatisfied despite achieving stability, often due to residual symptoms like stiffness or anterior knee pain 6
- Recovery involves 4-6 months of rehabilitation focusing on strengthening exercises
- Return to sports typically occurs at 6-9 months post-surgery
Potential Complications
Address risks honestly:
- Recurrent instability (approximately 6% risk) 6
- Stiffness or loss of motion
- Infection (standard surgical risk)
- Overcorrection leading to medial patellar pain if the reconstruction is too tight 7, 4
- Hardware irritation if bone procedures are performed 4
The Individualized Approach
Emphasize that the surgery is tailored specifically to their anatomy based on their MRI and X-ray findings 1, 2. Not every patient needs all procedures—some may only need MPFL reconstruction, while others with multiple anatomical abnormalities require combined procedures to address each contributing factor 2, 3.
The goal is to restore normal patellar tracking and prevent future dislocations while preserving knee function and preventing long-term arthritis 1, 5.