Meet Our Clinicians

John Clohisy, MD, Chief of Service
John Clohisy, MD, is the Daniel C. and Betty B. Viehmann Distinguished Professor of Orthopedic Surgery and the Chief of Service for Adult Reconstruction and Hip Preservation in the Department of Orthopaedic Surgery at Washington University School of Medicine. He also serves as the Director of the Young Adult Hip Service at Barnes-Jewish Hospital and the Director of Joint Preservation, Resurfacing and Replacement Fellowship program. He specializes in hip procedures and has a unique interest in the diagnosis and treatment of young adult hip problems. He and his Washington University colleagues have developed a comprehensive set of surgical and non-surgical skills to care for this unique patient population. Dr. Clohisy’s surgical expertise also includes hip arthroscopy, osteotomy, impingement procedures, and hip replacement. He is board-certified in orthopedic surgery and received his medical degree from Northwestern University in Evanston, IL in 1989. Following a residency in orthopedic surgery at Saint Louis University Health Sciences Center in St. Louis, he completed a fellowship in adult hip and knee reconstructive surgery at Massachusetts General Hospital/Harvard Medical School in Boston, MA in 1997. He also completed an orthopedic research fellowship at Saint Louis University School of Medicine. 

Robert Barrack, MD

Robert Barrack, MD
Robert Barrack, MD, is the Charles F. and Joanne Knight Distinguished Professor of Orthopedic Surgery at Washington University School of Medicine. He is nationally recognized for hip resurfacing procedures that preserve the hip joint. Board-certified in orthopedic surgery, Dr. Barrack earned his medical degree in 1980 from Vanderbilt University School of Medicine in Nashville, TN. He completed a residency in orthopedic surgery and a fellowship in orthopedic biomaterials at Tulane University School of Medicine (and Affiliated Hospitals) in New Orleans, LA and subsequently completed an additional fellowship in hip and implant surgery at Massachusetts General Hospital/Harvard Medical School in Boston, MA in 1991. Dr. Barrack’s clinical interests include adult reconstructive surgery, hip and knee replacement, MIS partial knee replacement, and hip resurfacing. Dr. Barrack has been listed in Best Doctors in America for ten consecutive years. 

Kimberly Bartosiak, MD
Dr. Bartosiak specializes in treating osteoarthritis, rheumatoid arthritis, and post-traumatic arthritis of the hip and knee, avascular necrosis, and all other degenerative conditions of the hip and knee. Dr. Bartosiak earned her medical degree at Loyola University Chicago Stritch School of Medicine in Maywood, IL, and graduated with research honors. She then completed an orthopedic residency at Washington University School of Medicine and Barnes-Jewish Hospital in St. Louis, MO, and an orthopedic fellowship in hip and knee reconstruction at Rush University Medical Center in Chicago, IL. 

Ilya Bendich, MD, MBA
Dr. Bendich's practice focuses on caring for patients with debilitating hip and knee arthritis, with a goal of improving function and quality of life through a variety of treatment options including conservative methods and surgical intervention. For patients who have exhausted all nonoperative measures and are ready for surgery, Dr. Bendich utilizes evidence-based, cutting-edge techniques, including computer-assisted and robotic technologies for improved surgical outcomes. Dr. Bendich earned a combined medical degree and master's degree in business administration from Dartmouth College, an Ivy League institution in New Hampshire, where he graduated with honors. He then completed a residency in orthopedic surgery at the University of California, San Francisco, and a fellowship in adult reconstruction and joint replacement at the Hospital for Special Surgery in New York.  

Charles Hannon, MD, MBA
Dr. Hannon is an orthopedic surgeon specializing in hip and knee replacement surgery. He has a particular interest in rapid recovery protocols, partial knee replacement, robotic-assisted joint replacement, anterior hip replacement, and complex primary and revision hip and knee replacements. Dr. Hannon focuses on individualizing treatment to each patient to provide the best possible care and outcomes for his patients. Dr. Hannon earned his medical degree from Georgetown University School of Medicine in Washington, DC. He then completed an orthopedic surgery residency at Rush University Medical Center in Chicago, IL while simultaneously earning a master's degree in business administration from The University of Chicago Booth School of Business. Dr. Hannon then completed an adult lower extremity reconstructive surgery fellowship at the Mayo Clinic in Rochester, MN.  

Douglas McDonald MD, MSDouglas McDonald, MD, MS

Douglas McDonald, MD, MS, is Professor of Orthopaedic Surgery at Washington University School of Medicine. He is board certified and a nationally recognized orthopaedic surgeon specializing in musculoskeletal oncology and adult reconstructive surgery of the hip and knee. Dr. McDonald received his medical degree from the University of Minnesota in 1982 and Master of Science degree from the University of Minnesota in 1987. He completed his orthopaedic surgery at the Mayo Graduate School of Medicine in 1987. He completed a Fellowship in orthopaedic oncology at the Mayo Clinic and an additional Fellowship in orthopaedic oncology at the Rizzoli Orthopaedic Institute in Bologna, Italy. Dr. McDonald’s primary expertise lies in the treatment of benign and malignant bone and soft tissue tumors of the extremities in children and adults. His hip and knee reconstructive surgery practice focuses on routine and complex joint replacement surgery.                        

Jeffrey Nepple, MDJeffrey Nepple, MD
Jeffrey Nepple, MD is an Assistant Professor of Orthopaedic Surgery at Washington University School of Medicine and the Director of the Washington University and St. Louis Children's Young Athlete Center. He specializes in both pediatric orthopedics and sports medicine, and has clinical interests in adolescent and young adult hip disorders, including femoroacetabular impingement (FAI), labral tears and slipped capital femoral epiphysis (SCFE) with a specific focus on minimally invasive arthroscopic techniques for the treatment of hip disorders. Dr. Nepple also has clinical interests in pediatric and adolescent knee disorders, including osteochondritis dissecans (OCD), anterior cruciate ligament (ACL) injuries, meniscal tears and patellar instability/dislocations. He received his medical degree from Washington University School of Medicine. He did a residency in Orthopaedic Surgery at Washington University School of Medicine, then went on to complete a fellowship in Sports Medicine at the Steadman Clinic/Steadman-Philippon Research Institute as well as a fellowship in Pediatric Orthopaedics at Washington University School of Medicine.

Ryan Nunley, MDRyan Nunley, MD
Ryan Nunley, MD, is an Associate Professor of Orthopedic Surgery at Washington University School of Medicine. He specializes in adult knee and hip reconstructive surgery. His other interests are total hip resurfacing, minimally invasive hip replacement, osteotomies about the hip, hip joint debridement, hip osteoplasty procedures and arthroscopy of the hip, hip disorders of the adolescent and young adult including hip dysplasia, Perthes deformities, avascular necrosis, labral tears, and early arthritic hip joint problems. Dr. Nunley received his medical degree from University of North Carolina School of Medicine in Chapel Hill, NC in 2002. At Washington University School of Medicine in St. Louis he completed a residency in orthopaedic surgery in 2007 and a fellowship in joint preservation, resurfacing, and replacement in 2008.

Regis O'Keefe, MD, PhDRegis O'Keefe, MD, PhD
Regis O'Keefe, MD, PhD, is the Chair of the Department of Orthopaedic Surgery at Washington University School of Medicine. Dr. O'Keefe received his medical degree from Harvard Medical School in 1985 and completed a surgical internship from Harvard Medical School/New England Deaconess Hospital in 1986. He served as an Instructor/Fellow of Research at the University of Rochester, School of Medicine and Dentistry until 1988, where he then went on to complete an orthopaedic surgery residency at the University of Rochester Medical Center in 1992. He then completed a Fellowship in Orthopaedic Oncology from the Massachusetts General Hospital in 1993. In 2000, he pursued a doctorate degree in biochemistry and biophysics from the University of Rochester, School of Medicine and Dentistry. Prior to arriving at Washington University School of Medicine, Dr. O'Keefe served as the Marjorie Strong Wehle Professor and the Chair of the Department of Orthopaedics and Rehabilitation at the University of Rochester School of Medicine and Dentistry in Rochester, NY. Dr. O'Keefe has clinical interests in primary and revision total hip and total knee arthroplasty, management of benign and malignant bone and soft (connective) tissue tumors in both children and adults, bone infections, skeletal reconstruction, curettage of bone tumors and allograft procedures.

Cecilia Pascual-Garrido, MD, PhD
Cecilia Pascual-Garrido, MD, PhD, is a Professor of Orthopaedic Surgery at Washington University School of Medicine. Dr. Pascual-Garrido specializes in hip preservation including hip arthroscopy, cartilage procedures, soft tissue injuries, hip resurfacing, and early and advanced osteoarthritis. Dr. Pascual-Garrido earned her medical degree at René Favaloro Medical University in Buenos Aires, Argentina. She then completed residency training in orthopaedic surgery at the Hospital Italiano de Buenos Aires, also in Argentina. Following her residency, she pursued a postdoctoral research fellowship in the Department of Biochemistry at Rush University Medical Center, and a research fellowship in the Cartilage Restoration Center in the Departments of Orthopedics & Anatomy and Cell Biology also at Rush University Medical Center. She then completed fellowship training in Orthopedic Sports Medicine at Barton Health in South Lake Tahoe, CA, Sports Medicine and Shoulder Surgery at the Hospital for Special Surgery in New York, NY, and Adult Reconstruction at the University of Colorado Hospital in Boulder, Colorado. Prior to joining Washington University Orthopedics, Dr. Pascual-Garrido was an Assistant Professor in Hip Preservation at the University of Colorado from 2014 to 2016. At the University of Colorado, she treated high-performance athletes including Olympians, colleges athletes, and amateurs. 

Dayna Bronson, MSN, NP-C
Dayna is an Adult Nurse Practitioner at Washington University Orthopedics. Dayna earned her Bachelor of Science in Nursing from Barnes-Jewish College of Nursing in St. Louis, Missouri. She then completed a Master of Science in Nursing/Adult Gerontology Primary Care Nurse Practitioner from Maryville University in St. Louis, Missouri. Dayna has a vast amount of experience providing preoperative and postoperative care to orthopedic patients.

Chad Schmitz, PA-C
Chad Schmitz, PA-C, is a Physician Assistant at Washington University Orthopedics. Chad received his Bachelor of Science in Sports Medicine and Health Management from Southeast Missouri State University. He later went on to pursue a Graduate of Physician Assistant Studies in 2002 at Cornell University Medical College. In his current role, Chad works with physicians in the Hip and Knee sub-specialties and assists with patient care. Prior to working at Washington University Orthopedics, Chad was employed as a Physician Assistant for 12 years and spent a significant amount of time managing patients with a wide variety of orthopedic conditions.

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