• Reduce Recovery Time

    From conservative care to advanced joint replacement, every treatment plan is personalized to your goals.

  • Back to Moving. Back to Living.

    Specialized Hip & Knee Care Focused on Restoring Mobility and Performance.

  • Where Does It Hurt?

    Explore treatment options for knee and hip conditions.

The Dr. Stewart Difference

Four principles that guide every patient interaction and surgical decision

industry
AI Surgical Pioneer
First in the World
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AI Surgical Pioneer
Dr. Stewart was the first surgeon in the world to use artificial intelligence in total hip replacement, pioneering AI guided anterior hip surgery with Orthogrid AI in 2022, available in Altoona at Oakleaf Surgical Hospital.
trust
Trust
Board Certified
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Trust
Board-certified orthopedic surgeon and published researcher in collaboration with UW-Eau Claire. Active member of AAHKS and AAOS with 25+ years of experience.
precision
Precision
Mako Robotics
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Precision
Mako robotic assistance allows for more accurate component positioning and improved longevity in Dr. Stewart's knee replacements, available at both our Altoona and Rice Lake locations.
recovery
Recovery
Back to Life
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Recovery
Dr. Stewart is committed to ensuring the fastest recovery possible, getting you back on your feet and returning to the activities that define your quality of life.
X-ray runner
Hip Joint — Click to view conditions
Groin — Click to view conditions
Knee — Click to view conditions
Buttock — Click to view conditions
Hover a joint · Click to explore

Where Is
Your Pain?

Choose a highlighted region to view related hip and knee conditions treated by Dr. Stewart.

EXPLOREHip Procedures
DISCOVERHip Conditions
DISCOVERKnee Conditions
EXPLOREKnee Procedures
Common Conditions
View All Conditions → View Treatments →
25+
Years of
Experience
Performing hip arthroscopy since 2000 — one of the most experienced hip specialists in Western Wisconsin.
98%
Direct Anterior
Approach Rate
Since 2013, over 98% of Dr. Stewart's hip replacements use the Direct Anterior Approach — reducing recovery time and improving accuracy.
2
Hospital
Locations
in Altoona at Oakleaf Surgical Hospital and in Rice Lake at Cedar Crest Surgery Center
2+
Published
Research Studies
Published research with UW–Eau Claire on FAI and sports participation, plus original research on Direct Anterior Approach positioning accuracy.
20+
Years Robotic
Assisted Surgery
An early adopter of MAKOplasty robotic technology for more precise component positioning and improved long-term outcomes.
Hover any stat to learn more
25+
Years of
Experience
98%
Direct Anterior
Approach Rate
3
Hospital
Affiliations
2+
Published
Research Studies
20+
Years Robotic
Assisted Surgery
Tap any stat to learn more

Wisconsin's Choice for Hip & Knee Surgery

Dr. Nathaniel Stewart, Orthopedic Surgeon
Your Surgeon
Dr. Nathaniel Stewart
Orthopedic Surgeon  ·  Hip & Knee
Leading orthopedic surgeon specializing in hip preservation, hip replacement, and advanced knee surgery.
Hip Arthroscopy since 2000 Member · AAHKS & AAOS Published Researcher First AI-Guided Hip Replacement · 2022 Early Adopter of Robotics
Dr. Nathaniel Stewart
Dr. Nathaniel Stewart
MD  ·  Hip & Knee Surgery

Dr. Stewart is a leading orthopedic surgeon specializing in hip preservation, hip replacement, and advanced knee surgery. As Western Wisconsin's most experienced hip arthroscopist, he has performed hip arthroscopy since 2000 and contributed research on femoroacetabular impingement (FAI) with the University of Wisconsin–Eau Claire. He performs all primary hip replacements using the direct anterior approach, supported by his published research demonstrating improved accuracy and recovery. A pioneer in surgical technology, he became the first surgeon in the world to use artificial intelligence–guided hip replacement in 2022 and continues to use MAKO robotics for knee replacement to enhance precision and balance.

Credentials & Recognition
Member, AAHKS
American Association of Hip and Knee Surgeons
Pioneer in Hip Arthroscopy
Performing hip arthroscopy since 2000
First surgeon in the world to use AI-guided hip replacement
2022 — Orthogrid AI, Oakleaf Surgical Hospital
Published Researcher
FAI and Sports Participation, UW Eau Claire; Robotics in anterior hip replacements

"I can do everything. I don’t have any restrictions whatsoever. It’s the best thing in the world. I woke up from surgery and had no more pain. It was the best thing I ever did."


What We Treat

Common Procedures

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State of the art robotic-arm assisted surgery for partial and total knee replacement. Mako technology delivers sub-millimeter precision, less tissue damage, and a faster recovery.

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Minimally invasive treatment for FAI, labral tears, and hip pain. For patients needing hip replacement, Dr. Stewart also offers the Direct Anterior Approach.

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Minimally invasive knee surgery used to evaluate and treat select meniscus, cartilage, and joint conditions through small incisions.

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Full hip joint replacement to relieve chronic pain and restore mobility when conservative treatments are no longer effective.

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Platelet-rich plasma therapy to accelerate healing in joints and soft tissue — a non-surgical option for the right candidates.

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Our Locations

Chippewa Falls

 

Phone: (715) 832-1400
Address: 757 Lakeland Dr, Chippewa Falls, WI 54729

 

Altoona

Phone: (715) 832-1400
Address: 1200 OakLeaf Way Altoona, WI 54720

 

Rice Lake

Phone: (715) 832-1400
Address:
2200 Cedarcrest Dr
Rice Lake, WI 54868

Accepting Patients Nationwide
Not in Wisconsin?
Great care is worth the trip.

Dr. Stewart sees patients from all over the country. Our team handles the coordination so you can focus on getting better. From your first call to your follow-up care, we make the process easy no matter where you are starting from.

3 Locations in Western Wisconsin
Same-Week Appointments
Remote Follow-Up Available