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Meet the Orthopedic Team

The physicians and staff at Alton Orthopedic Clinic and BJC Medical Group Orthopedics & Sports Medicine specialize in preventing, diagnosing and treating injuries related to participation in sports and exercise in patients of all ages. Whether you are exercising for recreation or a competitive athlete, the specialists are here to diagnose and treat medical problems.

Our sports medicine surgeons and physicians not only treat musculoskeletal injuries, but they can also play a role in performance medicine, where an athletes’ physiology is monitored, and aberrations corrected, in order to achieve peak physical performance. Our doctors treat injuries such as muscle, ligament, tendon and bone problems. They may also treat chronic illnesses that can affect physical performance, such as asthma and diabetes, as well as advising on the management and prevention of injuries.

Alton Orthopedic Clinic has six physician assistants on staff to provide care for their patients. A physician assistant (PA) is a nationally certified and state-licensed medical professional. They practice medicine under the supervision of physicians and surgeons. They are trained to examine patients, diagnose injuries and illnesses and provide treatment.

To make an appointment with an orthopedic specialist call 618.463.7600 or email us.


Aaron Omotola, MD
Alton Orthopedic Clinic and BJC Medical Group Orthopedics & Sports Medicine

Board-certified in orthopedic surgery and fellowship trained in sports medicine, Dr. Omotola earned his medical degree at Saint Louis University School of Medicine and completed his orthopedic surgery residency at Louisiana State University Health Sciences Center, New Orleans. He most recently finished his sports medicine fellowship training at the Ochnser Clinic, New Orleans, where he worked with the New Orleans Hornets and the New Orleans Saints.

John Stirton, MD
Alton Orthopedic Clinic and BJC Medical Group Orthopedics & Sports Medicine

Dr. Stirton received his Masters of Business Administration in Health Care Administration from the University of Dallas Graduate School of Management and earned his medical degree from the University of Texas Medical School, Houston. Dr. Stirton completed his orthopedic surgery residency at Michigan State University College of Human Medicine, Grand Rapids, and a fellowship in adult reconstruction at Lenox Hill Hospital, New York. Dr. Stirton treats children and adults. Dr. Stirton specializes in hip and knee replacement surgery and has advanced training in minimally invasive anterior approach hip replacement.

Janiece Stewart, MD
Alton Orthopedic Clinic and BJC Medical Group Orthopedics & Sports Medicine

Dr. Stewart is a sports medicine specialist and the head team physician for Southern Illinois University Edwardsville athletics. She earned her medical degree from Rush University Medical Center, Chicago, and completed a sports medicine fellowship at San Jose-O’Connor Hospital, California. A native of Belleville and a graduate of Belleville East High School, she has also served as team physician at Saint Louis University, the Gateway Grizzlies and at Collinsville and Belleville East high schools.

Physician Assistants:

Casey Newgent, PA-C, ATC

Casey graduated in 2008 from Northern Illinois University-DeKalb, with bachelor's degree in kinesiology and athletic training. She spent two years as an athletic trainer in an orthopedic office in Chicago and completed her master's in medical science in physician assistant studies at Midwestern University, Downers Grove, Illinois.

Lyndsi Sievers, PA-C

Lyndsi graduated in 2010 from Blackburn College, Carlinville, Illinois, with a bachelor's degree in biology. She earned her master's in medical science in physician assistant studies at Midwestern University, Downers Grove, Illinois.


Mary Stuart, PA-C

Mary earned her master of science in physician assistant studies at Southern Illinois University-Carbondale and completed her training in Quincy, Illinois, and at Alton Memorial Hospital. As a certified athletic trainer, Mary has specific interest and experience in sports-specific injuries and rehabilitation.

Courtney Guebert, PA-C

Courtney received her master of science in physician assistant studies in 2017 from Southern Illinois University. Since completing her advanced degree, she has been practicing as a physician assistant in a family medicine and orthopedic practice. Prior to completing her degree, she practiced as a certified nursing assistant until 2015.

Kimberlee Coppelli, PA-C

Kimberlee is a board-certified physician assistant who collaborates with John Stirton, MD. She believes in a patient-provider relationship that allows for shared decision making. Kimberlee's desire is to see patients regain their mobility so that they can lead active lives.

Find a doctor or make an appointment: 800.392.0936
General Information: 618.463.7311
Alton Memorial Hospital
One Memorial Drive
Alton, Illinois 62002

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