Meet Our Providers
Orthopedic Surgeons at Kentucky Bone & Joint Surgeons
Kaveh R. Sajadi, MD
Dr. Kaveh Robert Sajadi grew up in Lexington. He graduated cum laude from Vanderbilt University, and then earned highest honors at the University of Kentucky College of Medicine. He completed his orthopedic surgery residency at the prestigious Campbell Clinic-University of Tennessee, Memphis program, one of the oldest orthopedic training programs in the country.
After his residency, Dr. Sajadi performed an additional year of training as a fellow in shoulder and elbow surgery at the Hospital for Joint Diseases-New York University Medical Center in New York, NY. He then returned to Lexington where he joined his father, Dr. Kooros Sajadi, in practice. He is board certified in orthopedic surgery with a subspecialty certification in sports medicine.
Dr. Sajadi’s practice focuses on the individual patient, using their goals and desires to develop a treatment plan. His special expertise includes rotator cuff disorders, shoulder instability or dislocations, shoulder and elbow arthroscopy, and shoulder replacements, including reverse total shoulder and outpatient shoulder replacement.
Dr. Sajadi frequently trains other orthopedic surgeons at instructional courses in shoulder replacement and shoulder arthroscopy, both nationally and internationally. He is also a member of the American Shoulder & Elbow Surgeons, an organization with less than 500 members worldwide.
Dr. Sajadi lives in Lexington with his wife and two children. He enjoys travel and sports, both as a participant and fan. You will often find him rooting for the University of Kentucky Wildcats, except, of course, when they are playing the Vanderbilt Commodores!
Samuel C. Coy, MD
Dr. Sam Coy grew up in Richmond, KY. He graduated summa cum laude from Centre College in Danville, where he was a member of the varsity swim team. He earned his medical degree at Vanderbilt University and completed his orthopedic surgery residency at the University of Chicago. In addition, Dr. Coy completed a sports medicine fellowship at the Steadman Hawkins Clinic of the Carolinas, where he had intensive training in sports medicine. He is board certified in orthopedic surgery with a subspecialty certification in sports medicine.
Dr. Coy enjoys keeping people active and treating athletes of all ages, from the competitive athlete to the weekend warrior. His clinical interests include shoulder arthroscopy, knee arthroscopy and ligament reconstruction, treatment of meniscus tears, general fracture care, and knee replacements. Dr. Coy is a member of the American Orthopedic Society for Sports Medicine and team physician for East Jessamine High School.
Dr. Coy had early exposure to medicine through his father, Dr. James Coy, who is a retired orthopedic surgeon in Richmond, KY. Dr. Coy lives in Lexington with his wife and daughter. He enjoys attending UK sporting events and spending time at the family farm with his family and their dogs.
Andrew W. Ryan, MD
Dr. Ryan has been working with Kentucky Bone & Joint Surgeons since 2017. He graduated cum laude from Dartmouth College in New Hampshire where he studied abstract mathematics and then attended Indiana University School of Medicine graduating in 1988 to become the 4th generation “Dr. Ryan”. He completed a two year program in surgery at The John Hopkins Hospital in Baltimore, which included an intern year 1988-1989 and an additional year as Junior Assistant Resident, 1988-1990. Upon completion of his orthopedic residency program at The Ohio State University Hospital from 1991-1996, he joined Lexington Orthopaedic Associates which merged with Kentucky Bone & Joint Surgeons in 2017. Also in 2017 he began as a staff surgeon at the Lexington VA Hospital, teaching and overseeing resident surgeon activity and development. He now splits his clinical time between KBJS and the VA.
Dr. Ryan has been active with the Kentucky Orthopedic Society and served as Vice President from 2007-2009, and then President from 2009-2011. He currently represented Kentucky at the AAOS Board of Councilors from 2013 to 2019. He has delivered lectures on biomechanics of the golf swing, as well as analysis of new orthopedic materials. He has research interests in golf theory and decision making for surgeons and surgical economics. He considers his practice motto to be: Saving the world one limb at a time.
Dr. Ryan has developed a special interest in replacement surgeries for the hip and knee and is experienced in surgical and nonoperative management of conditions involving the shoulder, elbow, hands, hips, knees, and feet. His current surgical practice at KBJS addresses hip replacement surgery - both primary and revision cases - and revision knee replacement surgery.
Dr. Ryan began performing anterior approach total hip arthroplasty in 2010. He has recently completed his 1250th such operation (and counting), many of these as same day outpatient surgery at Baptist Health Surgery Center, previously known as Kentucky Surgery Center.
Although he grew up in Columbus, Indiana and then spent years wandering about major academic hospitals, he has been a settled active resident of Lexington since 1990. His children are now grown and he finds himself at holidays wherever his wife and kids tell him he should be.
Daniel J. Hackett, Jr, MD
Dr. Daniel Joseph Hackett, Jr grew up in Montgomery, Alabama. He graduated magna cum laude from Washington & Lee University, where he played wide receiver for the varsity football team. He earned his medical degree from the University of Alabama at Birmingham School of Medicine and completed his orthopedic surgery residency at the Medical College of Georgia. Afterwards, he pursued an additional year of training as a fellow in shoulder and elbow surgery at the University of Washington Medical Center.
Dr. Hackett places great emphasis on patient-directed care. He believes that taking the time to develop a relationship with each patient ensures that both he and the patient can work together to develop an informed decision, and ultimately, a great outcome. His clinical interests include arthroscopic and open management of complex shoulder and elbow issues. His expertise involves arthroscopic management of rotator cuff tears and instability, shoulder replacement surgery, including reverse total shoulder replacement and revision treatment for painful and infected shoulder replacements. He also spent a great deal of his training focusing on the surgical management of some less common shoulder abnormalities, such as scapular winging and sternoclavicular joint abnormalities.
Dr. Hackett's research interests include outcomes in primary and failed shoulder replacement and the management of infection following shoulder replacement.
Dr. Hackett lives in Lexington. Outside of work, he enjoys spending time with his family, fitness, sports, the outdoors, music and travel.
David A. Hamilton, Jr, MD, MBA
Dr. Hamilton grew up in Lexington, Kentucky where he graduated salutatorian from Tates Creek High School. He graduated from the University of Kentucky, where he was a walk-on quarterback on the football team. He completed a Masters of Business Administration from the Gatton College of Business and Economics before attending medical school at the University of Kentucky. He completed residency at the Department of Orthopedics & Sports Medicine at the University of Kentucky Medical Center, where he served as team doctor for Frederick Douglass High School Football.
He refined his orthopaedic focus during his Foot & Ankle fellowship at the University of Pittsburgh Medical Center.
He has been featured in a number of medical publications and has presented his research at local, regional, and national meetings. He is an active member of the American Academy of Orthopaedic Surgeons, Southern Orthopaedic Association, and American Orthopaedic Foot & Ankle Society.
Dr. Hamilton utilizes a patient-centered focus, recognizing that foot and ankle issues lead to other problems throughout the body. His clinical interests include foot and ankle problems such as bunions, arthritis, diabetic feet, heel spurs, flat foot, plantar fasciitis as well as sports injuries and fractures. He specializes in foot and ankle arthroscopy, ligament repair, total ankle replacement, flat foot and Charcot reconstruction, three-dimensional bunion correction, as well as minimally invasive techniques for tendon lengthening, bunion correction, and carpal tunnel release. He enjoys treating diabetic foot wounds and infections with the goal of limb salvage.
Dr. Hamilton lives in Lexington with his wife and two daughters. Aside from patient care, he enjoys sports, woodworking, gardening, hunting and fishing with his kids, and cheering alongside his wife at their children's sporting events.
Gary Bray, MD
Dr. Bray graduated from the University of Louisville with a bachelor's degree in Chemical Engineering, where he was also Captain of the swim team. He obtained his Doctor of Medicine from the University of Kentucky, followed by an orthopaedic residency, also at UK under Dr. Tom Brower. He is board certified by the American Board of Orthopaedic Surgery and is a member of the American Academy of Orthopaedic Surgeons, Kentucky Medical Society, Kentucky Orthopaedic Society, and the Lexington Medical Society.
As a general orthopaedist, Dr. Bray enjoys patients from pediatrics to geriatrics. He now focuses on providing independent medical exams, and enjoys the challenge of providing the optimal treatment for each individual.
Dr. Bray has served as a medical missionary to Haiti and with his family to Kenya. He lives in Lexington with his wife, and they enjoy traveling.
Greg Cowen, PA-C
Greg is a Lexington native and veteran of the United States Marine Corps. He graduated from the University of Kentucky PA program. Greg has over 20 years of experience, with 14 years in orthopedics. Before joining Kentucky Bone & Joint Surgeons, he ran the QuickCare Walk-In Clinic in Johnson City, TN for 12 years. Greg acted as a preceptor for an orthopedic fellowship program for physician assistants while in Johnson City. Greg is board certified by the National Commission on Certification of Physician Assistants.
Greg’s wealth of general orthopedic experience enables him to treat many conditions. His focus is on the treatment of acute fractures, sprains, and general orthopedic and sport-related injuries. He regularly performs viscosupplementation and therapeutic joint injections, fracture care, and urgent orthopedic care.
He lives in Lexington with his wife, Selena, and their three children. He enjoys coaching youth baseball and his hobbies include R/C airplanes and camping.
Kooros Sajadi, MD
Emeritus founder of the practice. Though he has retired from private practice, he continues to teach orthopedic surgery residents from the University of Kentucky and serve our veterans' orthopedic needs at the Veterans Administration Hospital.