About Napa Valley Joint Replacement

Recognized leaders, committed to you.

Experience counts. Technology matters.

Personalized care is essential.

With over 30 years combined experience in advanced hip and knee treatment, Doctors Diana and Shifflett combine their subspecialty expertise with modern minimally invasive techniques and leading technology in conducting more than 400 surgeries per year with proven patient outcomes and longterm results.


Our commitment to providing an individualized treatment plans for each Napa Valley Joint Replacement Center patient is reflected in our practice philosophy:

  1. Assess each patient thoroughly
  2. Develop a personalized treatment plan
  3. Select the highest quality implant based on individual patient needs
  4. Avoid economic conflicts-of-interest that can lead to poor medical decision making
  5. Be attentive to individual patient needs before, during, and after the surgery
  6. Maximize doctor-patient communication throughout treatment

Meet the Surgeons

Dr. John N. Diana, M.D.

Dr. John N. Diana, M.D.


Certified MAKO robotic surgeon for knee and hip replacements and Chief of the Hip Division at the Coon Joint Replacement Institute

Dr. Michael W. Shifflett, M.D.

Dr. Michael W. Shifflett, M.D.


Joint Replacement and General Orthopaedic Surgeon for over 22 years using specialized instrumentation and advanced techniques

"I consider this nothing short of a miracle."

I have always had a very active life style and was growing increasingly frustrated when painful and undependable knees forced me to restrict my activities…

"Having hip surgery may have been one of my best decisions to date"

I was living with everyday hip pain at about level 6 with frequent spikes to 9+ (on scale of 1 to 10.) It was the worst when I went from lying or sitting down, to getting up and moving…

Want to make an appointment?

Phone: (707) 254-7117

To make an appointment, please fill out our intake form so we can set up your visit with the correct doctor.

Napa Valley Joint Replacement Center

3273 Claremont Way, Suite 100
Napa, CA 94558