MPFL surgery (medial patellofemoral ligament surgery) is an operation performed for a dislocating or unstable kneecap (patella). Other terms are kneecap instability, patellar instability, patellar subluxation and recurrent patellar dislocation. I often see patients who have dislocated their kneecap. One episode may not mean surgery. A complete assessment is needed to recommend correct treatment…