Meet Our Team - Knee Specialists

Director of Research, Total Joint Center

Roy Aaron, MD is professor of orthopedics and professor of molecular pharmacology, physiology and biotechnology at Brown University. He completed his orthopedic training in the Harvard Combined Orthopedic Program and a fellowship in joint replacement surgery at the Robert Brigham Hospital. Aaron completed two research fellowships at the National Institutes of Health (NIH), one studying surgical physiology and one in basic cartilage biochemistry. He founded both the orthopedic laboratory and the joint replacement service at The Warren Alpert Medical School of Brown University.

Aaron’s clinical interests focus on joint diseases, particularly on osteoarthritis and avascular necrosis, and conservative therapies for joint preservation. Recent clinical investigations have concerned the role of knee arthroscopy, contrast-enhanced MRI for early diagnosis of osteoarthritis, and the prevalence of coagulopathies in both osteoarthritis and avascular necrosis. In the laboratory, he has been investigating the contributions of circulatory pathology to the initiation and progression of osteoarthritis. 

Aaron has served on 35 national panels, including ten NIH study sections, and committees of the Arthritis Foundation, American Academy of Orthopedic Surgeons and Orthopedic Research Society. He has authored over 100 scientific and clinical papers and three books. Several years ago, he received a Lifetime Achievement Award from the New England Arthritis Foundation.

Total Joint Surgeon

Valentin Antoci, MD, PhD is a fellowship-trained orthopedic surgeon who practices adult reconstruction, as well as hip and knee joint replacement, surgery. He has a particular interest in unicompartmental partial knee replacement, minimally invasive surgery, complex reconstructions, failed total joints, preservation techniques, and trauma.

Dr. Antoci earned his medical degree at Thomas Jefferson University in Philadelphia, and undertook extensive training at the Rothman Institute at Jefferson, in the Harvard Combined Orthopaedic Residency Program in Boston, and in the Harris Adult Reconstruction Fellowship Program at Massachusetts General Hospital.

His current research interests focus on joint implant design, tissue engineering, and biological interactions at the implant interface.

Dr. Antoci is a member of the American Academy of Orthopaedic Surgery, American Association of Hip and Knee Surgeons, and the Orthopaedic Research Society. Among his awards are the Infectious Diseases Society of America Edward H. Kass Fellowship and the Musculoskeletal Infection Society Jeannette Wilkins Award.

Total Joint Surgeon

Eric M. Cohen, MD, is an adult reconstructive and trauma orthopedic surgeon at Lifespan Orthopedics Institute. He specializes in direct anterior total hip replacement, complex total hip replacement after trauma, partial knee replacement, total knee replacement and periprosthetic fractures and infections. His research interests include orthopedic trauma and modifiable risk factors prior to total joint replacement. Dr. Cohen has published several journal articles and book chapters on these topics and has lectured nationally. He is a member of the American Academy of Orthopedic Surgeons, the American Association of Hip and Knee Surgeons, and the Orthopedic Research Society.

Program Director, Total Joint Center

John A. Froehlich, MD is the program director of the Total Joint Center at The Miriam Hospital. He is a specialist in the areas of adult reconstructive surgery and sports medicine, and he operates on patients of all ages suffering from a variety of shoulder, hip and knee ailments. Many of these procedures are done arthroscopically, which often means less pain, shorter rehabilitation and a quicker return to work. 

Included among the reconstructive procedures are: shoulder surgeries for rotator cuff disease, instability and impingement; knee surgeries for tissue repair; corrective procedures for arthritis, including joint replacement; and hip surgery including hip replacements. He is also involved in research on improving cartilage properties and the quality of joint replacements. 

Froehlich is a member of the American Academy of Orthopaedic Surgeons, American College of Surgeons and the American Board of Orthopaedic Surgeons. He is also a clinical assistant professor of orthopaedics at The Warren Alpert Medical School of Brown University. He is on staff at both Rhode Island Hospital and The Miriam Hospital.

Total Joint Surgeon

Derek Jenkins, MD, is an orthopedic surgeon and assistant professor at The Warren Alpert Medical School of Brown University. He earned his medical degree from Dartmouth Medical School, and completed his residency in general and orthopedic surgery at Lenox Hill Hospital in Manhattan, and a fellowship in adult reconstructive surgery at the Mayo Clinic in Rochester, Minnesota. He is a member of the American Academy of Orthopedic Surgeons and the American Association of Hip and Knee Surgeons. He specializes in adult reconstruction of the hip and knee, with a special interest in direct anterior total hip replacement, gap balanced total knee replacement, partial knee replacement and revision of failed/ infected joint replacements.

Rolf Langeland, MD, is a board-certified orthopedic surgeon with Newport Orthopedics, a Lifespan Physician Group practice. Dr. Langeland received his medical degree and orthopedic surgical training from the University of Connecticut School of Medicine; he continued his subspecialty training in sports medicine and joint replacement fellowship training at Duke University Medical Center in Durham, North Carolina. Prior to joining Newport Orthopedics, he practiced for 20 years with Orthopaedic Specialty Group in southern Connecticut, where he specialized in sports medicine and reconstructive joint and trauma surgery. Dr. Langeland has particular expertise in arthroscopic (minimally invasive) joint restoration of the upper and lower extremities, in addition to trauma reconstruction and reconstructive joint replacement.

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Orthopedic Surgeon

Roald Llado, MD is a fellowship-trained adult reconstruction orthopedic surgeon at The Miriam Hospital and a clinical assistant professor of family medicine at The Warren Alpert Medical School of Brown University.

After graduating from Duke University, he earned his medical degree and completed his residency training at the Drexel University College of Medicine, Philadelphia, PA. He subsequently completed a specialized fellowship in joint preservation and reconstruction at the Rubin Institute for Advanced Orthopedics at the Sinai Hospital of Baltimore, MD.

Llado’s orthopedic interests include minimally invasive primary and complex hip and knee replacement, reconstruction of fractures around prosthetic hip and knee implants and management of general orthopedic conditions and fractures. He has conducted research on periprosthetic joint infections as well as heterotopic ossification in less invasive total knee replacements.

Michael Mason, DO, received his medical degree from the Philadelphia College of Osteopathic Medicine. He did his internship and orthopedic surgical residency at Community General Hospital in Harrisburg, Pennsylvania and he continued his subspecialty fellowship training at Massachusetts General Hospital and Brigham and Women’s Hospital, affiliates of Harvard Medical School. Dr. Mason has designed and been involved in the development of multiple artificial joints, and has more than 20 years of experience in joint replacement and reconstructive surgery, most recently at New England Baptist Hospital in Boston.

Dr. Mason is a board-certified orthopedic surgeon with Newport Orthopedics.

Chief of Musculoskeletal Oncology, Rhode Island Hospital

Richard Terek, MD is an orthopedic surgeon and musculoskeletal oncologist who specializes in reconstructive surgery and musculoskeletal oncology for adult and pediatric patients. He is an expert in the treatment of patients with bone and soft tissue tumors. He is actively engaged in medical education and is an NIH-funded investigator whose research is focused on understanding how bone cancer grows and spreads to other parts of the body, with the ultimate goal of developing new targeted therapies. He is professor in the department of orthopedic surgery at The Warren Alpert Medical School of Brown University.

Dr. Terek received his medical degree from the University of Chicago Pritzker School of Medicine in Chicago. He completed his orthopedic surgery residency at Loyola University Medical Center in Maywood, Illinois, and was an American Cancer Society Clinical Oncology Fellow in surgical oncology at Memorial Sloan-Kettering Cancer Center in New York, New York.

Dr. Terek is certified by the American Board of Orthopedic Surgery and is a fellow of the American Academy of Orthopedic Surgeons and the American College of Surgeons. He is past president of the Rhode Island Orthopedic Society and president-elect of the Musculoskeletal Tumor Society.

Learn more about the Orthopedics Institute »