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Timothy J. Bonatus, D.O.

General Orthopaedics, Trauma, Fracture Care, Arthroplasty Surgery of the Hip and Knee

Dr. Bonatus is a board certified Orthopaedic Surgeon who helped pioneer Northern Arizona Orthopaedics in the early years. He has been providing life-saving trauma care and joint care in Flagstaff since 1995. He practices in the Arthritis and Fracture Care Center.  Dr. Bonatus expertise lies in treating arthritis, including rheumatoid arthritis, and degenerative diseases of the knee and hip, as well as fracture care, arthroscopy joint replacement and adult reconstructive surgery.

Dr. Bonatus offers minimally invasive surgical approaches to joint care, using state-of-the-art implants and bearings. He is trained in robotic surgery, computer navigation and the use of custom equipment to optimize patient outcomes. He customizes each surgery approach and the joint implant to meet the individual needs of the patient, their lifestyle and activities.

Dr. Bonatus is fellowship sub-specialty trained in Orthopaedic Trauma and fracture care at UC Davis Medical Center. Dr. Bonatus and his partner, Brandon Clark, D.O., are the only fellowship-trained Orthopaedic Trauma surgeons north of Phoenix. Their life-saving skills are performed at the Level 1 Trauma Center in Flagstaff and lives are being saved for trauma victims daily. Together, they provide a tremendous service in this region.

Prior to moving to Flagstaff, Dr. Bonatus served on the USS California, and as Chief of Orthopaedics at Naval Hospital Camp Pendleton. A true advocate for value-based and collaborative healthcare in Northern Arizona, he is a leader in efforts to improve the way healthcare is provided in our communities.

Other surgeons in the Arthritis and Fracture Care Center: 


  • Trauma Fellowship U.C. Davis Medical Center, Davis, California
  • Orthopaedic Surgery Residency U.S. Naval Hospital, Oakland, California
  • Doctorate of Medicine Chicago College of Osteopathic Medicine, Chicago, Illinois

Professional Affiliations

  • American Academy of Orthopaedic Surgeons
  • Arizona Osteopathic Medical Association
  • Arizona State Trauma Association

Personal Quote

“There's nothing I want more than to helping patients recover from their injuries and return to normal function. I find a personal fulfillment in educating patients in a way that encourages them to make the right care choices for them and their lifestyle. Then, I tailor the treatment to meet their individual needs. ”

Patient Testimonials

”Dr. Bonatus is absolutely excellent and I would highly recommend him to anyone! Not only is he knowledgeable and highly skilled, he displayed a genuine concern for me, spent appropriate amounts of time explaining the procedures I had and followed up afterwards. If you live in northern AZ, don't go anywhere else!“


”That was likely the best Dr. visit I've ever had. Everyone there at NAO is top-flight professional.“


”During my pre-op appointment, Dr. Bonatus asked me if I had any questions. I said "Yea, how many total hip replacements have you done?" He answered "Over 2,000." My response: "Ok, we are good to go then!" To date (13 days after total hip replacement) I'm doing fantastic according to both Dr. Bonatus' PA and the Physical Therapist. It is SO nice to no longer hurt with a bad hip! This facility is GREAT!“

L. Mitchell