Dr. Robert Armstrong, D.O. Robert Armstrong, D.O. completed his undergraduate studies at Wilkes College. He graduated from the University of Medicine and Dentistry of New Jersey - New Jersey School of Osteopathic Medicine. His rotating internship was performed at Allentown Osteopathic Medical Center. Dr. Armstrong completed his orthopedic surgery residency training at the Community General Osteopathic Hospital, Harrisburg. He completed a fellowship in Adult Reconstructive Surgery (Emphasis on total joint replacements) at the DePaul Health Center and the DePaul Biomechanical Research Laboratory, St. Louis.