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Meet Our Clinicians


In the photo:
Seated from left to right: Jeffrey Martin, MD, Chad Schmitz, PA, Robert Barrack, MD, Ryan Nunley, MD
Standing from left to right: Douglas McDonald, MD, MS, John Clohisy, MD, Rick Wright, MD, Muyibat Adelani, MD, Paul Lux, MD, Cara Cipriano, MD. Not pictured: Regis O'Keefe, MD, PhD, Cecilia Pascual-Garrido, MD

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.

Muyibat Adelani, MD
Muyibat Adelani, MD, is an Assistant Professor of Orthopedic Surgery at Washington University School of Medicine. She received her medical degree from Vanderbilt University School of Medicine in Nashville, Tennessee. She completed her residency in Orthopedic Surgery at Washington University School of Medicine in St. Louis, Missouri, then completed a fellowship in Adult Joint Reconstruction at Stanford University School of Medicine in Palo Alto, California. Dr. Adelani specializes in joint replacements, and has clinical interests in treating osteoarthritis, avascular necrosis, total hip and knee replacement, partial knee replacement, minimally invasive hip replacement, revision hip and knee replacement, core decompression.

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.

Cara Cipriano, MD

Cara Cipriano, MD
Cara Cipriano, MD, is an Assistant Professor of Orthopaedic Surgery at Washington University School of Medicine. She earned her medical degree from Perelman School of Medicine at the University of Pennsylvania. She did her residency in Orthopaedic Surgery at Rush University Medical Center, then completed fellowships in both Adult Reconstructive Surgery at Virginia Commonwealth University and Orthopaedic Oncology at the University of Toronto. Dr. Cipriano specializes in musculoskeletal oncology and adult reconstruction, and has clinical interests in treating sarcomas and other bone and soft tissue malignancies, benign tumors and cysts, metastatic bone disease, metabolic bone disorders, degenerative disease of the hip and knee due to osteoarthritis, rheumatoid arthritis, trauma, and avascular necrosis.

Paul Lux, MD
Paul Lux, MD, is an Associate Professor of Orthopaedic Surgery at Washington University School of Medicine. He specializes in hip and knee surgery, including arthritis surgery of the hip and knee and total joint replacements in young patients. Dr. Lux earned his medical degree from Tulane University, in New Orleans, Louisiana, then completed an internship in General Surgery at the University of Louisville Hospitals, in Louisville, Kentucky. Following his internship, he did a research fellowship in Hand and Reconstructive Microsurgery at the Christine Kleinert Research Institute in Louisville, Kentucky. Dr. Lux then completed a residency in Orthopaedic Surgery from the University of Louisville School of Medicine, and a fellowship in Adult Reconstruction at DePaul Health Center in St. Louis, Missouri. Prior to joining Washington University Orthopedics, Dr. Lux was in private practice in the St. Louis area for over 26 years, and has been consistently recognized as a Best Doctor in America® by St. Louis Magazine.

Jeffrey Martin, MD
Jeffrey Martin, MD, is an Associate Professor of Orthopaedic Surgery at Washington University School of Medicine. He specializes in adult hip and knee replacement, including the surgical treatment of osteoarthritis, and arthritis conditions resulting from trauma, infection, developmental disorders, or autoimmune disease. He also has a special interest in the development of techniques for efficient, less invasive, high quality joint replacement. Dr. Martin completed both his medical degree and a residency in Orthopaedic Surgery from Case Western Reserve University in Cleveland, Ohio. He then completed a fellowship in Adult Reconstructive Surgery at DePaul Hospital. Dr. Martin is a board-certified Associate Professor of Orthopaedic Surgery at Washington School of Medicine, and is consistently recognized as a Best Doctor in America®.

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 Chairman 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 Chairman 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
Cecilia Pascual-Garrido, MD, is an Assistant Professor of Orthopaedic Surgery at Washington University School of Medicine. 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. 


Rick Wright, MD, Executive Vice Chairman, Department of Orthopedic Surgery
Rick Wright, MD, is a board-certified orthopedic surgeon and serves as the Jerome J. Gilden Distinguished Professor of Orthopaedic Surgery at Washington University School of Medicine, the Executive Vice Chairman of the Department of Orthopaedic Surgery and the Orthopedic Surgery Residency Program Director. Recognized for his sports medicine expertise, Dr. Wright serves as the head team physician for the St. Louis Blues hockey team. Dr. Wright earned his medical degree from the University of Missouri in 1988. Following a residency in orthopedic surgery at Vanderbilt University in Nashville, TN, he completed a fellowship in sports medicine at the Minneapolis Sports Medicine Center in 1999. His special interests include primary total knee replacements, knee ACL and revision ACL injuries, meniscus injuries, articular cartilage injuries of the knee and shoulder instability, and rotator cuff disease.

Al Klahs, RN, NP-C
Al Klahs, RN, NP-C, is a Nurse Practitioner at Washington University Orthopedics. Al received both his Bachelor of Science in Nursing and a Master of Science in Adult Nurse Practitioner studies from Maryville University. Al has worked in the nursing field for over 23 years, and has a vast amount of experience working with patients in a variety of clinical settings including, ICU, Trauma, Internal Medicine and Orthopedics. 

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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The Center for Adolescent & Young Adult Hip Disorders


The Center for Adolescent & Young Adult Hip Disorders

The Center for Adolescent and Young Adult Hip Disorders, one of the most rapidly advancing subspecialties in orthopedics, provides comprehensive, specialized care. Click here to learn more.