Dr. Mark Oyer completed an Adult Reconstruction Hip and Knee Fellowship at the University of Wisconsin Madison School of Medicine and Public Health. During residency, he developed my interest in the orthopedic sub-specialty of total joint replacement. He has special interest in outpatient and minimally invasive surgery, the Direct Anterior Approach for total hip replacement, and complex revision surgery.
Dr. Mark Oyer completed an Adult Reconstruction Hip and Knee Fellowship at the University of Wisconsin Madison School of Medicine and Public Health. During residency, he developed my interest in the orthopedic sub-specialty of total joint replacement. He has special interest in outpatient and minimally invasive surgery, the Direct Anterior Approach for total hip replacement, and complex revision surgery.
Welcome to OrthoIllinois!
I very much look forward to being able to provide your care and help you resume a more pain free and active life! I’d like to share a little background on how I came to be a total joint specialist and the focus of my practice.
I am a long-term Midwesterner, in fact my hometown is Tremont, Illinois, located southeast of Peoria in central Illinois. Growing up, I spent a lot of time working alongside my father, who was a carpenter by trade. I think my earliest influences for a medical career were piqued by my mother. As a nurse, she impressed upon me the difference medical care can make in people’s lives. I also learned the values derived from hard work by helping out on my grandfather’s farm.
As a youth, I also found time for competitive activities and was a three-sport athlete playing football, basketball and baseball. It was through playing sports and sustaining various injuries that required treatment procedures that I was first exposed to orthopedics. With a growing interest in how the body works and heals, I pursued my undergraduate degree in kinesiology from the University of Illinois at Urbana-Champaign as a recipient of two scholarships and graduating with Highest Honors on the Dean’s List.
I followed my undergraduate studies at the University Of Illinois College Of Medicine at Peoria where I earned my medical degree as a Graduate of Distinction. I remained in Illinois when I was accepted by Northwestern University, Feinberg School of Medicine Orthopedic Residency Program in Chicago where I completed both my internship and residency training. I then gained additional advanced training by completing an Adult Reconstruction Hip and Knee Fellowship at the University of Wisconsin Madison School of Medicine and Public Health.
During residency, I developed my interest in the orthopedic sub-specialty of total joint replacement. Of all surgical fields, I believe total joint replacement provides the best results and most importantly, not only provides patients with pain relief, but gives them back the lifestyles they love. As a hip and knee surgeon, I find it an honor and a privilege to return patients’ trust by giving them back the ability to pursue an active life.
In my practice, I have a special interest in outpatient and minimally invasive surgery, the Direct Anterior Approach for total hip replacement, and complex revision surgery. I strive to work with my patients to identify the best option for them, whether surgical or non-surgical treatment, to put an end to arthritic pain and return them to their normal lives once more.
When I am not treating patients, I enjoy playing with my chocolate Labrador, golfing, fishing, watching professional basketball, baseball, and football, and working out. My wife and I are serious foodies and enjoy just hanging out with friends and family.
Thank you for entrusting me with your care and I look forward to helping put an end to your hip and knee pain!

A doctor who really cares for you. He takes his time with you and is very through. Highly recommend.
Had total knee done in Feb 2026. Everything went smoothly. Much less pain than I was expecting. I did stay on top of pain and used ice often. Took prescribed medication for about a week then over to Tylenol. Physical therapy is going well. I would suggest Dr.Oyer for your knee surgery.
Doctor Oyer and the staff at OrthoIllinois did an amazing job on my knee.. Thank you all
Tremendous visit! Great personality! His knowledge and expertise regarding my upcoming surgery was impressive! I can’t wait to be scheduled!
Very pleasant and down to earth.
Truly the very best!
Very knowledgeable and personable. He takes the time needed to answer any questions.
Couldn't have asked for a better experience. Dr. Oyer is an great surgeon. Friendly yet very informative . I highly recommend.
Excellent care. Answers all questions. Listens!
Very personable Dr and explained what all the options are.