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About David Ritzow, M.D.

Dr. Ritzow is a board-certified orthopedic surgeon who began practicing in 1998. He joined Valley Orthopedic Clinic, which eventually joined forces with OSI, in 2007.

Dr. Ritzow treats patients in Appleton and is an Active Fellow of the American Academy of Orthopedic Surgeons. A member of the Wisconsin Medical Society, Dr. Ritzow serves as a clinical instructor for the Fox Valley Family Medicine Residency Program and is a trained consultant for the Community First Fox Cities Marathon.

During his career, Dr. Ritzow has participated in the Lawrence University and Appleton Area School District athletic programs, as well as OSI’s Medical Mentoring Program.

Clinic Locations

Care Team


Primary Specialties


  • University of Wisconsin School of Medicine and Public Health
  • Internship & Residency: Michigan State University
  • Subspecialty Certificate in Orthopedic Sports Medicine


Patient Reviews

I had a total knee replacement done by Dr. Ritzow & I couldn’t be happier with my results. Dr. Ritzow & his staff were very professional & very friendly. I especially liked all the informative automated text messages I received & am sorry to see them end. I would highly recommend Dr. Ritzow to anyone who needs knee replacement surgery!!

-Mike Holzknecht

Very informative and thorough. Takes the time to explain everything to you. Very pleased with Dr. Ritzow

-Lee VandenHeuvel

Dr. Ritzow is the best Orthopedic surgeon I’ve ever met. He has done things that allayed a knee replacement for 10-12 years, when it did need surgery, it was always absolutely needed. He doesn’t operate unless it was absolutely the last option.

Know this, surgery is never to be feared, just avoided if at all possible. That’s who this man is!

I’ve personally sent 9 friends and family, all 9 were told they needed joint replacement, all but one never had surgery or replaced said joints.

One was my 70+ year old father, Dr Ritzow scoped his knee, he died 19 years later with the same joints he was born with.

-Michael Verkuylen

Additional Specialties

  • Foot/ankle
  • Fracture care
  • Hand/carpal tunnel
  • Sports medicine
  • Trauma
  • Upper extremity
  • Workers’ Compensation