MRI. The Baton Rouge Orthopaedic Clinic operates two MRI units to meet the specific needs of our patients.The ONI Extremity MRI system, which is the world's first and only high field extremity magnet, specializes in exams of the foot, ankle, knee, hand, wrist, and elbow.This state of the art technology allows you to sit comfortably in a chair while placing only your extremity into the ….