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John Nicholas Diana, MD

Primary Location:
Address 6 Woodland Rd Suite 202
St. Helena, CA 94574
Specialties: Orthopedic Surgery Patient Rating: Gender: Male


Board certified orthopedic surgeon, John Diana, MD, is Chief of the Hip Division at the Coon Joint Replacement Institute, specializing in minimally invasive knee and hip replacement surgery. Dr. Diana has performed approximately 2000 hip replacement surgeries, nearly half of which were performed using the anterior hip replacement approach. He has performed over 2000 knee joint replacement surgeries, is highly regarded for his work in computer-assisted navigation for joint replacement surgery, and is certified as a MAKO™ robotic surgeon for both knee and hip replacements.

Dr. Diana focuses extensively on minimally invasive joint replacement surgery, using the latest state-of-the-art technologies. Using these minimally invasive surgical techniques may reduce pain, restore mobility and promote a quick return to normal activities for patients suffering from osteoarthritis and other conditions.

Dr. Diana graduated Phi Beta Kappa from Indiana University, and earned his medical degree from Indiana University School of Medicine. He completed his internship and residency at Hospital of the University of Pennsylvania, where he was awarded Chief Residency of Orthopedic Surgery. As Chief Resident, Dr. Diana received the DeForest Willard Award, the highest honor that can be bestowed upon a graduate.

Dr. Diana is an active member of the American Association of Hip and Knee surgeons. A devoted family man, Dr. Diana enjoys spending time with his wife, son and daughter. His primary interest, outside of work and time with family, is ultrarunning. Ultrarunning is primarily trail running and involves races over a marathon distance. Dr. Diana was a volunteer physician for the U.S. Olympic Marathon Trials in 2012, and is a member of the USATF. He has also done volunteer medical work in both Guatemala and Kenya, providing medical services and education.


  • American Board of Orthopaedic Surgery, Orthopaedic Surgery, 2003


  • Internship

    Hospital of the University of Pennsylvania

  • Residency

    Hospital of the University of Pennsylvania

  • Medical School

    Indiana University School of Medicine


Learn more about patient ratings
  • 02/27/2020
    Rating: 5

    My experience with Dr. Diana was great I left feeling very confident about what needed to be done.

  • 02/13/2020
    Rating: 5

    Excellent personal attention to me and detail of my health concerns

  • 02/07/2020
    Rating: 5

    I saw Dr Diana and he remembered me from when I visited two years ago before I really needed the surgery.

  • 01/30/2020
    Rating: 5

    Thank you for your care so far.Im sure I will not be disappointed with my surgery.Can't wait!


  • Primary Location Coon Joint Replacement Institute
    6 Woodland Rd Suite 202
    St. Helena, CA 94574
    (707) 968-0670 Map and directions
  • Additional Location Napa Valley Orthopaedic Medical Group
    3273 Claremont Way Ste 100
    Napa, CA 94558
    (707) 254-7117 Map and directions