Dr. Douglas Armstrong

Adam Hyatt is an Orthopedics provider in Lancaster, Pennsylvania. Dr. Hyatt is rated as an Advanced provider by MediFind in the treatment of Trochlear Dysplasia. His top areas of expertise are Tendinitis, Bursitis, Tenosynovitis, Osteoarthritis, and Hip Replacement. Dr. Hyatt is currently accepting new patients.

Andrew Cosgarea, M.D., is a sports medicine specialist with expertise in the diagnosis and nonsurgical treatment of sports-related injuries, particularly those affecting the knee and shoulder and elbow, including sprains, strains, ligament tears and joint instability. An experienced sports medicine surgeon and a professor of orthopaedic surgery at the Johns Hopkins University School of Medicine, Dr. Cosgarea will transition away from performing surgical procedures as of July 1, 2025. He will continue to provide office-based patient care, and will remain actively involved in clinical consultation, research and medical education. Dr. Cosgarea’s research focuses on knee biomechanics and improving outcomes in the treatment of sports injuries. He has authored two textbooks and more than 150 peer-reviewed articles and book chapters. His surgical expertise includes arthroscopic rotator cuff repair, ACL reconstruction, meniscus repair, elbow UCL reconstruction and shoulder instability stabilization procedures. He serves as the head team physician for the Johns Hopkins University Department of Athletics, is the former chief of the Division of Sports Medicine in the Johns Hopkins Department of Orthopaedic Surgery, and served as a team physician for the Baltimore Orioles from 2000 to 2010. In 2012, he was named one of the “125 Knee Surgeons and Specialists to Know” by Becker’s Spine Review. Dr. Cosgarea is a member of numerous professional organizations, including the American Board of Orthopaedic Surgery, the American Orthopaedic Society for Sports Medicine, the Arthroscopy Association of North America, and the International Patellofemoral Study Group. Additionally, he serves on the board of directors of the Patellofemoral Foundation. He earned his medical degree from Jefferson Medical College in Philadelphia, did his orthopaedic surgery residency at the University of Rochester and completed a fellowship in orthopaedic sports medicine at The Johns Hopkins Hospital. Prior to joining Johns Hopkins in 1998, he was an assistant professor of orthopaedic surgery at the Ohio State University Medical Center, and served as an orthopaedic consultant for the Ohio State athletic department. Videos Dr. Andrew Cosgarea Meniscus InjuriesQ&A with Dr. Andrew Cosgarea Recent News Articles and Media Coverage History of second Tommy John surgeries raises questions about Mike Clevinger’s futureThe San Diego Union-Tribune (November 2020) Running and aging usually don't mix. But at 62, quitting isn't an option for me.The Washington Post (May 2019) 3 ACL Tears Won’t Keep Creighton’s Martin Krampelj off CourtAP News (October 2018) ACL SurgeryMichelle Baker's StoryJohns Hopkins Medicine (March 2017) Insider: Why can't the Colts stay healthy?Indystar.com (September 2016) The Most Common Injury at the OlympicsCNN.com (August 2016). Dr. Cosgarea is rated as an Advanced provider by MediFind in the treatment of Trochlear Dysplasia. His top areas of expertise are Hypermobile Joints, Trochlear Dysplasia, Osteoarthritis, Osteotomy, and Endoscopy.

Joseph Petfield is an Orthopedics specialist and a Pediatrics provider in Hershey, Pennsylvania. Dr. Petfield is rated as an Advanced provider by MediFind in the treatment of Trochlear Dysplasia. His top areas of expertise are Scoliosis, Clubfoot, Claw Foot, Beukes Familial Hip Dysplasia, and Spinal Fusion.