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  • Services
    Orthopaedic surgical team using advanced 3D imaging technology during a procedure
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    VIEW SERVICES
    Icon of robotic arm
    Robotic Total Knee Replacement
    Icon of foot injury
    Foot and Ankle
    icon of a spine injury
    Back and Spine
    Icon of a bone fracture
    General Orthopaedics
    Icon of medical provider
    Prescribe FIT
    icon of man running
    Sports Medicine
    Wrist hand icon
    Hand and Wrist
    Icon of x-ray
    Radiology
    Icon of physical therapy
    Physical / Occupational Therapy
    icon of hip replacement
    Total Joint Replacement
    Icon of joint reconstruction
    Joint Reconstruction
    Icon of pain management
    Interventional Pain Management
  • Medical Team
    Orthopaedic surgical team using advanced 3D imaging technology during a procedure
    SCHEDULE NOW
    ALL PROVIDERS
    Dr. Christopher Gay
    Christopher Gay
    M.D.
    Dr. David Constantinescu
    David Constantinescu
    M.D.
    Dr. Amanda Brazis
    Amanda L. Brazis
    DPM
    Dr. Treg Brown
    Treg D. Brown
    M.D.
    Dr. David Davis
    D. David Davis
    M.D.
    Dr. J. Michael Davis
    J. Michael Davis
    M.D.
    Dr. J. T. Davis
    J. T. Davis
    M.D.
    Dr. Tennyson Lee
    Tennyson W. Lee
    M.D.
    Dr. Rhett MacNeille
    Rhett MacNeille
    M.D.
    Dr. Steven Young
    Steven D. Young
    M.D.
  • Locations
    Behind the scenes look at doctor conversing with patient.
    Orthopaedic Institute of Southern Illinois building
    Orthopaedic Institute of Southern IL – Herrin (Main Campus)
    Deaconess Crossroads Hospital - Mt. Vernon
    Deaconess Crossroads Hospital – Mt. Vernon
    Outside of SIOC Carbondale
    OISI – Carbondale
    Southern Illinois University student health center hallway
    SIU Student Health Center – Carbondale
    Outside rendering of Harrisburg Medical Center
    Harrisburg Medical Center – Harrisburg
    Outside of Herrin Hospital
    SIH – Herrin Hospital
    Deaconess Illinois - Marion
    Deaconess Medical Center IL – Marion
    Outside of Memorial Hospital of Carbondale
    SIH – Memorial Hospital of Carbondale
    SIOC Building
    Southern Illinois Orthopedic Center (SIOC) – Herrin (Main Campus)
    Outside of Marshall Browning Hospital
    Marshall Browning Hospital – Du Quoin
    Outside of Franklin Hospital
    Franklin Hospital – Benton
    Outside of Fairfield Memorial Hospital
    Fairfield Memorial Hospital – Fairfield
  • News
  • Patient Education Media
  • Contact
  • About
  • Services
    Orthopaedic surgical team using advanced 3D imaging technology during a procedure
    SCHEDULE NOW
    VIEW SERVICES
    Icon of robotic arm
    Robotic Total Knee Replacement
    Icon of foot injury
    Foot and Ankle
    icon of a spine injury
    Back and Spine
    Icon of a bone fracture
    General Orthopaedics
    Icon of medical provider
    Prescribe FIT
    icon of man running
    Sports Medicine
    Wrist hand icon
    Hand and Wrist
    Icon of x-ray
    Radiology
    Icon of physical therapy
    Physical / Occupational Therapy
    icon of hip replacement
    Total Joint Replacement
    Icon of joint reconstruction
    Joint Reconstruction
    Icon of pain management
    Interventional Pain Management
  • Medical Team
    Orthopaedic surgical team using advanced 3D imaging technology during a procedure
    SCHEDULE NOW
    ALL PROVIDERS
    Dr. Christopher Gay
    Christopher Gay
    M.D.
    Dr. David Constantinescu
    David Constantinescu
    M.D.
    Dr. Amanda Brazis
    Amanda L. Brazis
    DPM
    Dr. Treg Brown
    Treg D. Brown
    M.D.
    Dr. David Davis
    D. David Davis
    M.D.
    Dr. J. Michael Davis
    J. Michael Davis
    M.D.
    Dr. J. T. Davis
    J. T. Davis
    M.D.
    Dr. Tennyson Lee
    Tennyson W. Lee
    M.D.
    Dr. Rhett MacNeille
    Rhett MacNeille
    M.D.
    Dr. Steven Young
    Steven D. Young
    M.D.
  • Locations
    Behind the scenes look at doctor conversing with patient.
    Orthopaedic Institute of Southern Illinois building
    Orthopaedic Institute of Southern IL – Herrin (Main Campus)
    Deaconess Crossroads Hospital - Mt. Vernon
    Deaconess Crossroads Hospital – Mt. Vernon
    Outside of SIOC Carbondale
    OISI – Carbondale
    Southern Illinois University student health center hallway
    SIU Student Health Center – Carbondale
    Outside rendering of Harrisburg Medical Center
    Harrisburg Medical Center – Harrisburg
    Outside of Herrin Hospital
    SIH – Herrin Hospital
    Deaconess Illinois - Marion
    Deaconess Medical Center IL – Marion
    Outside of Memorial Hospital of Carbondale
    SIH – Memorial Hospital of Carbondale
    SIOC Building
    Southern Illinois Orthopedic Center (SIOC) – Herrin (Main Campus)
    Outside of Marshall Browning Hospital
    Marshall Browning Hospital – Du Quoin
    Outside of Franklin Hospital
    Franklin Hospital – Benton
    Outside of Fairfield Memorial Hospital
    Fairfield Memorial Hospital – Fairfield
  • News
  • Patient Education Media
  • Contact

Home / Medical Team

Medical Team

The providers at the Orthopaedic Institute of Southern Illinois are a highly skilled team of board-certified physicians, surgeons, and advanced practice professionals dedicated to delivering exceptional musculoskeletal care. With specialized expertise across orthopaedics, spine care, interventional pain management, and podiatry, each provider is committed to understanding the unique needs of every patient and developing personalized treatment plans using the latest medical advancements and technology. Working collaboratively across multiple locations, the team offers comprehensive care—from diagnosis through recovery—focused on reducing pain, restoring mobility, and improving overall quality of life with compassion, respect, and clinical excellence.

Surgeon performing a procedure

Meet Our Physicians

Dr. Christopher Gay

Christopher Gay

M.D.
Interventional Pain Management
Dr. David Constantinescu

David Constantinescu

M.D.
General Orthopaedics, Total Joint Replacement
Dr. Amanda Brazis

Amanda L. Brazis

DPM
Foot and Ankle, Total Joint Replacement
Dr. Treg Brown

Treg D. Brown

M.D.
General Orthopaedics, Joint Reconstruction, Sports Medicine, Total Joint Replacement
Dr. David Davis

D. David Davis

M.D.
Back and Spine, General Orthopaedics, Total Joint Replacement
Dr. J. Michael Davis

J. Michael Davis

M.D.
General Orthopaedics, Joint Reconstruction, Total Joint Replacement
Dr. J. T. Davis

J. T. Davis

M.D.
General Orthopaedics, Sports Medicine
Dr. Tennyson Lee

Tennyson W. Lee

M.D.
Back and Spine, Interventional Pain Management
Dr. Rhett MacNeille

Rhett MacNeille

M.D.
Joint Reconstruction, General Orthopaedics, Total Joint Replacement
Dr. Steven Young

Steven D. Young

M.D.
Hand and Wrist, General Orthopaedics

Meet Our Providers

Austin Bradley

Austin Bradley

Nurse Practitioner
Scott Cutler, PA

Scott Cutler

Physician Assistant
David Mason, PA

David Mason

Physician Assistant
Gretchen Mason

Gretchen Mason

Physician Assistant
Jeremy Palmer, PA

Jeremy Palmer

Physician Assistant
Stephanie Poettker, NP

Stephanie Poettker

Nurse Practitioner
Garret Smith, NP

Garret Smith

Nurse Practitioner
Michelle Steh

Michelle Steh

Nurse Practitioner
Lukas Ward, PAC

Lukas Ward

Physician Assistant

Meet Our Physical and Occupational Therapists

Eric Osman

PT, ATC
Physical / Occupational Therapy

Dane Elliott

PT, ATC
Physical / Occupational Therapy

Collin Prather

DPT
Physical / Occupational Therapy

Nicole Parmly

DPT
Physical / Occupational Therapy

Katharine Frerichs

DPT
Physical / Occupational Therapy

Jacob Russell

DPT
Physical / Occupational Therapy

Kim Peters

OT, CHT
Physical / Occupational Therapy

Marcia Skinner

PTA
Physical / Occupational Therapy

Logan Reeves

PTA
Physical / Occupational Therapy

Cali Wright

PTA
Physical / Occupational Therapy

Ready to Take the Next Step?

Our team is here to help you live with less pain and more freedom.

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Services

Robotic Total Knee Replacement
Foot and Ankle
Back and Spine
General Orthopaedics
Prescribe FIT
Sports Medicine
Hand and Wrist
Radiology
Physical / Occupational Therapy
Total Joint Replacement

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The Orthopaedic Institute complies with applicable Federal civil rights laws and does not discriminate on the basis of race, color, national origin, age, disability, or sex.

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