Meet the Team


The goal of the UP Health System - Portage orthopedic team is to provide the best possible care right here in the Copper Country. The team works in an integrated- and cooperative-group setting that strives to provide cost-effective care that will return our patients to the quality of life they’re used to.

UP Health System - Portage’s orthopedic team is trained in the preservation, investigation, and restoration of the form and function of the extremities and associated structures by medical, surgical, and physical means.

Aaron Leininger, DO

  • Total hip replacement 
  • Total knee replacement
  • Total shoulder replacement
  • Sports medicine injuries and care of the elite level athlete
  • Ligament reconstruction of the knee, including ACL and MCL repair
  • Cartilage repair
  • Shoulder surgery including arthroscopic rotator cuff repair and reconstruction
  • Elbow injuries
  • Hand and wrist injuries
  • Foot and ankle
  • Fracture care
  • Pediatric orthopedic care including clubfoot
  • Click here to access a full list of services offered by Dr. Leininger.


Ron Ronquist, MD 

  • Total joint reconstruction; knee arthroplasty, hip arthroplasty
  • Rotator cuff repair
  • Shoulder arthroscopy, knee arthroscopy
  • Carpal tunnel release
  • Orthopedic trauma
  • Foot and ankle surgery


Michael Carter, MD

  • Fellowship trained in Sports Medicine
  • Arthroscopy - Shoulder, Knee Ankle
  • ACL reconstruction
  • Rotator cuff & shoulder instability surgery
  • Shoulder replacement
  • General orthopedics & fracture care


Jesse Primeau, PA-C