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St. Luke's Children's Rheumatology

Kids get arthritis too! Modern treatment of juvenile arthritis requires state-of-the-art medications and a team of supporting medical staff. If your child has been diagnosed with arthritis or a similar condition, our team will collaborate with your referring physician to explore your options and provide the best care for your child throughout the course of treatment.

Our team sees patients with a variety of conditions, including, but not limited to:

  • Juvenile arthritis
  • Juvenile lupus
  • Systemic lupus
  • Periodic fever syndromes
  • Dermatomyositis
  • Still's disease
  • Macrophage activation syndrome
  • Autoinflammatory syndromes


  • Rheumatology


    W. Patrick Knibbe, MD, FACR specializes in the treatment of rheumatoid arthritis, lupus, osteoporosis, and pediatric rheumatologic diseases. He also cares for conditions such as hypermobility syndromes and periodic fever syndromes in adults. He is dedicated to putting his patients' needs first and particularly enjoys working with pediatric patients, who keep him young at heart. 

    Dr. Knibbe is a fellow of the American College of Rheumatology and president of the Association of Idaho Rheumatologists. For almost two decades, he has arranged annual continuing medical education opportunities for his colleagues. He has also been an active investigator in clinical trials at St. Luke’s for many years, focusing on rheumatoid arthritis, psoriatic arthritis, osteoporosis, and lupus.

    Dr. Knibbe earned his medical degree in the internal medicine honors program at University of Utah School of Medicine and served as an internal medicine resident at the University of Iowa. He then completed a fellowship back at the University of Utah, where an elective month at Children's Hospital Los Angeles set the stage for his specialization in pediatric rheumatology in Utah and Idaho, where he initiated the pediatric rheumatology programs at both Primary Children's Hospital and St. Luke's Children's.

    In his free time, Dr. Knibbe enjoys skiing, cycling, and running the Salmon River with his family (including his son who is a professional river guide in McCall). Now in the sunset of his athletic career, he's concentrating on golf and shooting his age for 18 holes. He and his wife are both avid patrons of the arts and are active in the community supporting the Idaho Shakespeare Festival, Boise Art Museum, and LED.


    Accepting new patients
  • Pediatric Rheumatology


    Clayton Sontheimer, MD specializes in treating children and teenagers with rheumatologic diseases, including arthritis, lupus, periodic fever syndromes, macrophage activation syndrome, dermatomyositis, and Still's disease.

    Prior to joining St. Luke's, he was a faculty member at Seattle Children's Hospital and was involved in both medical education and clinical care.

    Dr. Sontheimer is the first board certified pediatric rheumatologist to practice in Idaho.


    Accepting new patients
    • St. Luke's Health Partner
      St. Luke's Health Partner

      These providers work together to achieve patient-centered care, using proven best practices to offer better care to you and your family.

    • Specialties, Conditions & Treatments

Access Your Mobile Medical Record Anytime, Anywhere

Sign up for a MyChart account today!

With MyChart, you’re able to view test results, contact your provider, request medication refills, schedule appointments and more. We encourage you to sign up for easy access to the tools and information you need to proactively manage your health. You can also set up online proxy access requests for medical records of children, spouses, or dependents.

There's also an easy-to-use MyChart app available for your mobile devices!

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