About Me

I’m a urologist, with a major focus on the management of kidney stones. At The Ohio State University Wexner Medical Center, we perform more than 500 surgeries a year related to kidney stones.

Research at the Comprehensive Kidney Stone Program ties directly to our clinical program. I explore new treatments for kidney stones including medications and surgical techniques. I also study the use of lasers in the treatment of stones.

My goal is to personalize the health care delivered to each patient. I work with my patients to develop individualized treatment plans. Effective treatment of stones can provide relief of an acutely painful episode and also reduce future stone recurrences. Such treatment can significantly improve a patient’s quality of life.

My wife, Dr. Eunice Oppenheim-Knudsen, is a family practice physician who works at Ohio State’s Wexner Medical Center’s Upper Arlington Clinic. We both enjoy living in the Columbus area and working at a top tier medical center. We strive to maximize the quality of life for our patients.


  • Director, Comprehensive Kidney Stone Program
  • Fellowship trained in endourology and kidney stone disease; recognized world expert in minimally invasive kidney stone surgery
  • President of the Ohio Urological Society, 2014-2015
  • Rated in the top 10 percent of physicians in the nation for patient satisfaction, 2016, 2017
  • Named to the Castle Connolly list of America’s “Top Doctors” for 2017
  • Best Doctor in America 2017

Additional Languages I Speak

  • German

Specialties and Conditions I Treat

  • Urology
  • Kidney Calculi
  • Ureteral Calculi
  • Urinary Bladder Calculi
  • Urinary Calculi
  • Lithotripsy, Laser
  • Ureteroscopy
  • Cystoscopy
  • Prostatic Hyperplasia
  • Nephrostomy, Percutaneous
  • Lithotripsy
  • Urology

Locations Where I Practice

Please note: Not all physicians schedule patients at each listed location. Please call the “Schedule an appointment” number shown above for scheduling assistance.

Education and Training

Medical Degree

University of Manitoba


Health Sciences Center
7/1/1997 - 6/13/2002


St. Joseph's Hospital
7/1/2002 - 10/13/2004

My Videos

More About My Work

My Background

Board Certification

American Board of Urology

My Department



225 Patient Satisfaction Reviews

The overall patient satisfaction rating is an average of all patient responses to the six doctor communication related questions shown below from the Clinician and Group Consumer Assessment of Healthcare Providers and Systems survey. For additional information about the patient satisfaction survey, please visit our Patient Satisfaction Survey page.

The comments are submitted by patients and reflect their view and opinions. The comments are not endorsed by and do not necessarily reflect the views of Ohio State Wexner Medical Center.

  • Overall
    4.8 out of 5
  • Explains Things Clearly 4.8
  • Listens Carefully 4.8
  • Gives Understandable Instructions 4.8
  • Knows My Medical History 4.7
  • Shows Respect 4.8
  • Time Spent Together 4.8

23 Patient Comments

Reviewed on Jun 13, 2018

Good information - friendly - frequently long wait in office.

Reviewed on Jun 10, 2018

Drs. Knudsen and Grindley have found the careers in which they belong!

Reviewed on Jun 04, 2018

Very knowledgeable and listened to all my concerns and questions.

Reviewed on May 30, 2018

VERY thorough.

Reviewed on May 28, 2018

Everything was great.

Reviewed on May 22, 2018

He answered any questions I had about my scans.

Reviewed on May 14, 2018

Dr. Knutsen displayed a genuine concern for my health.

Reviewed on Apr 28, 2018

Very Good

Reviewed on Apr 20, 2018

Dr. Knudsen is the best.

Reviewed on Apr 18, 2018

Physician is always very attentive, caring, compassionate, courteous, and listens to my opinions/concerns. Clearly explains the issues/problems, concern for safety/overall well-being on recommended treatment, monitoring, and follow-up. Provides clear explanations of procedures/treatment. Clearly communicates his expectations from me (ie, drink more water, healthy diet, exercise, sent to ER if symptoms necessitate further follow-up he cannot address in his office, etc.). Spends appropriate time needed to address issues, questions, and concerns of current, or future treatment. Asks if all necessary paperwork completed.

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Consulting and Related Relationships

At The Ohio State University Wexner Medical Center, we support a faculty member’s research and consulting in collaboration with medical device, research and/or drug companies because a faculty member’s expertise can guide important advancements in the practice of medicine and improve patient care. In order to provide effective management of these relationships, the University requires annual disclosures from all faculty members with external interests related to their University responsibilities.

As of 03/26/2018, Dr. Knudsen has reported relationships with the companies or entities listed below. If you have questions about the relationships listed below, please ask the faculty member. If you have questions about how these relationships are monitored by The Ohio State University Wexner Medical Center, please contact our Compliance Office at 614-293-7802.

  • Boston Scientific
  • Coloplast Corp
  • Bard Medical