Alexandra Research Technologies

Alexandria Research Technologies (ART) was a medical device company specializing in innovative orthopaedic solutions for knee replacement. Founded by Dr. Gerard Engh and Wesley Johnson, the company developed the "Tissue Guided Surgery" (TGS) platform, which aimed to optimize implant placement based on a patient's unique knee kinematics. Their primary products included the MIRROR Partial Knee System and the TGOS Unicompartmental Knee Arthroplasty system, both of which received FDA clearance. Headquartered in Plymouth, Minnesota, the company focused on minimally invasive techniques to restore knee function in patients with osteoarthritis. Although the company is currently inactive, its technologies contributed significantly to the field of patient-specific orthopaedic surgery.