Understanding Patellar Instability: Insights from Dr. David Diduch at the 2026 NYU Patellofemoral Course

What factors contribute to patellar instability, and how can surgeons better identify them? In this excerpt from his keynote presentation at the 2026 NYU Patellofemoral Course, David R. Diduch, MD, Professor of Orthopaedic Surgery at the University of Virginia, examines the relationship between key anatomical measurements and patellar instability. Drawing on clinical research, Dr. Diduch explores how abnormalities in the patellar tendon–lateral trochlear ridge (PT-LTR) distance can occur even when tibial tubercle–trochlear groove (TT-TG) measurements appear normal. His findings highlight the importance of evaluating multiple anatomical factors when assessing patellar instability and making surgical decisions. This presentation offers valuable insights for orthopedic surgeons, researchers, and medical professionals specializing in patellofemoral disorders.