This edition of Campbell's Operative Orthopaedics is dedicated to the hundreds of residents, fellows, and international visitors who have trained at "Dr. Campbell's Clinic" during its first 100 years. Their enthusiasm for learning and their commitment to our specialty have inspired the authors of all twelve editions of Campbell's Operative Orthopaedics to strive to produce a trusted and useful tool for continued learning, a tradition we hope continues for the next 100 years.