United Orthopedic Corporation

Preface Throughout the evolution of total knee replacement science, significant improvements have been achieved to both implant design and implantation techniques, refining the procedure to routinely provide measurable improvements in clinical results. Amidst these advancements, the body of science continues to evolve, inspiring further refinements in both TKR implant and instrumentation design. At United Orthopedic Corporation, our research and development efforts have focused on a comprehensive review of the contemporary state of the art, an observance of time proven performance and design elements, and thoughtful analysis of those areas which may be improved through refined design elements. Our research areas included a scientific review of contemporary TKR designs and their associated clinical performance, along with a dimensional analysis of normal human knee anatomy, a study of motion patterns which achieve deep flexion, and key mechanisms of wear and failure in present designs. We then applied this data to evaluate ideal implant shape, size range, contact geography, durability, and increased functional range of motion. The result is a comprehensive design intended to enhance patient satisfaction. We invite you to reference the U2 Design Rationale documents for further information. Among the major features of the U2 Knee design are: • A science-based size range for improved implant fit and associated capsular / soft tissue interactions • An interchangeable femorotibial articulation for essier size matching • A refined PS Progressive Rollback Post and Cam mechanism to provide more effective anatomic rollback behavior for improved ROM potentials • An improved Post and Cam jumping distance to reduce dislocation potential • A multi radius femoral component curvature to encourage physiologic ligament tension relationships The U2 Total Knee System Instrumentation key components include: • Anterior Reference System to accurately position anterior flange blending • Distal Femoral Valgus cutting guide in 1-degree increments • PS Notch Cutting Guide with powered Reamer and Osteotomes for precise preparation • Both Intramedullary and Extramedullary Tibial Alignment Guide Options • Both Inset and Onset Patellar Cutting Guide Options to accurately prepare and restore the patellar thickness • Femoral/Tibial Spacer Blocks to allow assessment of the extension and flexion gap balance • Four compact sterilization trays to provide efficient instrument handling MIS options include minimal size instrumentation, a patented Distal Femoral Cutting Guide and Femoral Sizing Caliper to improve working within the spacial limitations of the incision. CMA stem/augment options include instruments to allow adequate management of minor or moderate tibial defects with the use of augments and the extension stem.