At TRIA, we balance measuring patient outcomes, which can be considered small continuous improvements, with innovative research studies, which are those grand advancements in orthopedic care. These research studies explore the latest in medical devices, instruments, implants, methods and procedures.

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If you are interested in participating in one of our currently enrolling studies or would like more information, please contact the TRIA Research Institute: | 952-806-5603

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