Dr. Lonner is a board certified Orthopaedic Surgeon specializing in the surgical treatment of knee arthritis and meniscus tears. For over twenty years he has been a leader in the fields of partial and total knee replacement surgery. In fact, worldwide he is amongst the highest volume providers of unicompartmental, patellofemoral, and total knee replacements. He was one of the first surgeons in the U.S. to use robotic methods for knee replacement surgery, having introduced robotic techniques to the greater Philadelphia region in 2008.