Dr. Michael P. Ast is Chief of the Knee Service, Chief Medical Innovation Officer and Director of Ambulatory Surgery Center Strategy at HSS. He is a hip and knee replacement surgeon focusing on rapid-recovery, short-stay and outpatient joint replacement surgery and is an expert in robotics and computer-assisted surgery for hip and knee replacements. He holds the John N. Insall Endowed Chair of the Knee Service and is a member of the prestigious Knee Society.