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Our Physicians

Kevin T. Heaton, D.O.

Orthopedic Surgeon

Dr. Heaton is a board-certified orthopedic surgeon, and native to the Klamath Falls area.  He is also on the American Osteopathic Board of Orthopedic Surgeons, and a member of the American Osteopathic Academy of Orthopedics.  He received his fellowship training in Adult Reconstruction and Joint Replacement from the Arthritis Institute at Good Samaritan Hospital in Los Angeles, California.

Edward L. Van Tassel, D.O.

Orthopedic Surgeon

Dr. Van Tassel is an Oregon native with more than 25 years of experience in General Orthopedics. He is a Board Certified Member of the American Osteopathic Association and the American Osteopathic Academy of Orthopedics.

Karl R. Knudsen, M.D.

Orthopedic Surgeon

Dr. Knudsen is a board-certified orthopedic surgeon and member of the American Board of Orthopedic Surgery.  He is also a Fellow at the American Academy of Orthopedic Surgeons.  He completed both his general surgery internship and orthopedic surgery residency at the Stanford  University Hospital in Palo Alto, CA.  Dr. Knudsen also has a fellowship in Sports Medicine/Arthroscopy and Shoulder Reconstruction. With his understanding of sports-related injuries, Dr. Knudsen treats the athletes of Oregon Institute of Technology and our region’s public and private high schools.

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Gillian A. Bayley, M.D.

Orthopedic Surgeon

Dr. Bayley is a board-certified orthopedic surgeon fully trained in the treatment of all foot and ankle problems. She obtained her medical degree and residency at the University of Ottawa in Ontario, Canada. Her foot and ankle reconstruction fellowship training was completed at the University of Calgary. She is certified in both Canada and the United States and is an active member of the American Orthopaedic Foot & Ankle Society.

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Luke W. Hosack, M.D.

Orthopedic Surgeon

Dr. Hosack is board-eligible orthopedic surgeon with a fellowship in total joints. He received his medical degree from University of Illinois College of Medicine, Cum Laude. He also holds a Master in Chemical Engineering with a Bioengineering Focus. In his free time, Dr. Hosack enjoys spending time with family and camping.

Fred F. Naraghi, M.D., QME

Orthopedic Surgeon

Dr. Naraghi is a board-certified spine surgeon with more than 20 years of experience. He completed his spine surgery fellowship at the San Francisco Spine Institute and owned his own private practice prior to joining Klamath Orthopedic in 2020.

Logan R. Koehler, M.D.

Orthopedic Surgeon

Dr. Koehler is a board-eligible orthopedic surgeon, with a hand specialty. He completed his Hand Fellowship at Integris Baptist Medical Center in Oklahoma City prior to joining Klamath Orthopedic in 2020.

About Us

Klamath Orthopedic and Sports Medicine Clinic brings highly skilled orthopedic care to Klamath Falls and the surrounding areas. Our physicians are trained in several different disciplines and bring their own expertise to the practice. We are dedicated to our mission of achieving exceptional outcomes through personalized, compassionate care. Your treatment is our highest priority. Your health is our greatest concern.

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