CVOSM - Key Persons


Connor Olson

Job Titles:
  • Member of the My Team

Dr. Brent Carlson

Job Titles:
  • Certified Orthopedic Surgeon
Dr. Brent Carlson is a board-certified orthopedic surgeon with a special interest in hip, knee, and shoulder surgery. His areas of expertise include arthroscopic surgery of the hip and total hip replacement, arthroscopic surgery of the shoulder and various shoulder replacements, as well as knee arthroscopy and knee replacement. Dr. Carlson was raised in Stillwater, Minnesota, where he graduated high school as valedictorian. He attended St. Olaf College and graduated summa-cum-laude. While at St. Olaf, he competed in Division 1 Nordic Skiing, becoming an Academic All-American. He then went on to medical school at the University of Minnesota. While in medical school, he continued skiing, competing in the Norwegian Skarveremet and the American Birkebeiner, where he scored as high as 3rd overall in the classic race. Dr. Carlson was granted a scholarship to train with Drs at the end of his medical school training. Leiv Hove and Ove Furnes in orthopedics at the Universitetsykehus in Bergen, Norway. He completed his orthopedic training at Albany Medical Center in Albany, NY, which was, at the time, the busiest orthopedic trauma center in the state of New York. Dr. Carlson is a Chippewa Valley Orthopedics and Sports Medicine partner based in Eau Claire, Wisconsin. He joined the group in 2010. He regularly sees patients at his offices in Eau Claire and Chippewa Falls and Stanley and Hayward, Wisconsin. He is a physician owner of OakLeaf Surgical Hospital in Eau Claire and operates frequently in other hospital areas. He continues skiing competitively across the country and enjoys hunting, fishing, hiking, canoeing, and spending time with his wife and four young boys.

Dr. Nathan Harris

Job Titles:
  • Board - Certified Orthopedic Surgeon
Dr. Nathan Harris is a Board-Certified Orthopedic Surgeon who provides specialized care for patients experiencing joint pain and orthopedic injuries. He received his medical degree at the University of North Dakota and completed his residency at the University of Missouri-Kansas City. He then received additional training in complex hip and knee arthroplasty and revision joint replacement during his fellowship at New York University. When he is not working, he enjoys skiing, golf, hunting, and spending time with his wife and two daughters.

Jeff Ehrhard

Job Titles:
  • Member of the My Team

Kamal Thapar

Widely respected by patients, their families, and their doctors, Dr. Thapar has served the region for more than a decade. He maintains one of the largest private neurosurgical practices in Wisconsin and provides a full spectrum of advanced neurosurgical care. Specializing in minimally invasive and reconstruction spine surgery, brain tumor surgery, pituitary tumor surgery, and skull base surgery, Dr. Thapar and his team strive to provide a level of care that is second to none for one fundamental reason: because you are second to none.

Mark McCarthy

A complex shoulder and knee specialist, Dr. McCarthy graduated from the University of Minnesota Medical School, did his orthopedic residency in Iowa City, and completed a sports medicine fellowship at Rush University. Since 2016, Dr. McCarthy has provided orthopedic expertise to patients throughout Western Wisconsin, serving patients from Jackson County to Barron County. He is currently the team physician for the Eau Claire Express.

Nathaniel Stewart

Job Titles:
  • Surgeon
Dr. Stewart is an orthopedic surgeon specializing in hip and knee surgery in Eau Claire, Altoona, and Chippewa Falls. As the most experienced hip arthroscopist in Western Wisconsin, Dr. Stewart began performing hip arthroscopy in 2000. Being an orthopedic surgeon at the forefront of arthroscopic treatment of femoroacetabular impingement, Dr. Stewart has published research in collaboration with the University of Wisconsin - Eau Claire on the relationship between sports participation and femoroacetabular impingement (FAI). Current research includes how FAI can lead to hip arthritis. As a member of the American Association of Hip and Knee Surgeons, orthopedic surgeon Dr. Stewart is dedicated to providing state of the art care for hip and knee patients in the Eau Claire, Altoona, and Chippewa Falls area. In December of 2013, Dr. Stewart began using the direct anterior (DA) approach for hip replacement surgery in the vast majority of patients. Currently, over 98% of his hip replacements are done through the direct anterior (DA) approach. While he changed to the direct anterior approach for faster patient recovery, his original research published in January of 2016(1) demonstrated the increased accuracy of component positioning of total hips done through the direct anterior approach as compared to the more commonly used posterior approach. In 2014, orthopedic surgeon Dr. Stewart began to add computer navigation to his total hip replacement procedures. This allows for computer monitoring of the joint surgery to ensure accuracy. In the spring of 2016, Dr. Stewart has added the MAKO Robot to many of his total hip operations, in a continued effort to provide the most accurate hip replacement possible. Dr. Stewart joined Chippewa Valley Orthopedics and Sports Medicine Clinic in 2003. As an orthopedic surgeon, he is grateful for the trust patients and referring physicians have given him over these years. He is also thankful to the hospital staff at OakLeaf in Altoona, Sacred Heart in Eau Claire, and St. Joseph's Hospitals in Chippewa Falls. Their dedication and hard work allow Dr. Stewart and the other members of Chippewa Valley Orthopedics and Sports Medicine Clinic to provide exceptional orthopedic care to the Chippewa Valley. Dr. Stewart, his wife, and three children enjoy sports and the outdoors, as well as visiting family throughout Western Wisconsin and the Twin Cities.

Timothy Mess

Job Titles:
  • Member of the My Team

Troy Berg

Job Titles:
  • Physician for the CVOSM Sports Medicine
Dr. Berg has provided orthopedic expertise to the Western Wisconsin area since 1998. He is an Orthopedic Surgeon and a Sports Medicine Specialist with a special interest in knee and shoulder surgery. Dr. Berg is joined by Dr. Austin Crow as team physicians for the University of Wisconsin-Eau Claire Blugolds. He and Dr. Crow's licensed athletic training staff also provide athletic injury coverage for many of the area high schools. Dr. Crow, a native of the Twin Cities, first came to the Chippewa Valley in 1999 when he attended UW-Eau Claire. His medical studies and orthopedic training took him across the country, but he was excited to return home to the Midwest. Committed to providing personalized and effective care for orthopedic patients throughout the Chippewa Valley, Dr. Crow focuses on athletes of all levels and their return to play. He is trained in advanced surgical techniques and nonoperative treatment of knees, shoulders, ankles, hips, and overall athletic care. Dr. Crow is joined by Dr. Berg as a physician for the CVOSM Sports Medicine program. He and Dr. Crow's licensed athletic training staff also provide athletic injury coverage for many of the area's high schools.