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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.

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.

Luke W. Hosack, M.D.

Orthopedic Surgeon

Dr. Hosack is board-certified 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-certified 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.

What Patients Say

"I am grateful every day that I can actively use my left arm, since Dr. Karl Knudsen repaired my shoulder. I can’t put into words how much I appreciate it. I would never again have been able to do all of the things I love to do if not for his work. "

Justin Fay

CO-Owner Base Camp Brewing Company, Portland, Oregon

I knew I needed to have something done on my knee when I could no longer do the things I love – hunting and fishing. Since my surgery, my pain has reduced significantly. For anyone who is ready to have a joint replacement, there is no need to look outside Klamath Falls. Have your surgery close to home and recover close to home without sacrificing anything

Wayne Snoozy

Patient

Dr. Knudsen helped me get back to my life. I was told to go to Bend or Medford for this kind of surgery, but I am so glad that I stayed here. My recovery has been outstanding – I wouldn’t go anywhere else.”

Henry Perry

Patient

I have all the faith in the world in Dr. Heaton. His orthopedic care is outstanding. My care was so superb, I wouldn’t go anywhere else. I’m a runner and a bike rider, and I’m ready to get back at it.