At TRIA, our physician-led research group conducts innovative research which is balanced with outcomes based research.  Many of our research studies explore the latest medical devices, instruments,  implants, methods, and procedures.  We provide support to our investigators in federal, industry, and investigator-initiated trials to improve patient outcomes and advance the field of orthopedics.

Positioned within a large health system allows us to implement clinical research studies expeditiously and across the continuum of care. 

If you are interested in participating in one of our studies or would like more information, please contact us at or 952-806-5603.

The Federal Government has finalized Section 1557 clarifying the nondiscrimination provision of the Affordable Care Act.  This Final Rule clarifies and codifies existing nondiscrimination requirements.  As part of this Final Rule, we have linked here for you our statement of nondiscrimination.

Focus Areas:

  • Bone health
  • Concussion
  • Fracture care
  • Geriatrics
  • MSK Radiology
  • Ortho pain
  • Ortho primary care
  • Patient reported outcomes
  • Rehabilitation
  • Sports medicine
  • Total joint


Sub Specialties:

  • Concussion
  • Foot/ankle
  • Geriatric fracture
  • Hand
  • Hand therapy
  • Hip
  • Knee
  • Physical therapy
  • Shoulder
  • Value



Study Name:

Surgical Timing and Rehabilitation for Multiple Ligmant Knee Injuries

Enrollment Status:

Current Study

Principal Investigator(s):

Brad Nelson, MD


Jonathan CooperDO ; James Irrgang, PT, PhD ; Volker Musahl, MD

Diagnosis Being Studied:

Multiple ligament knee injuries represent a spectrum of injury from disruption of at least two ligaments, to disruption of all four major knee ligaments: the anterior cruciate ligament (ACL), the posterior cruciate ligament (PCL), the medial collateral ligament (MCL) and the lateral collateral ligament (LCL).


The purpose of this study is to investigate effects of timing of surgery (early vs. delayed) and timing of post-operative rehabilitation (early vs. delayed) for the treatment of military personnel and civilians that sustain a multiple ligament knee injury.

Who Should Participate:

  • Patients between the ages of 16-55 with a multiple ligament knee injury