To continue into this sixth edition would not be possible without the continued support of our loyal users. Thank you to the faculty, students, and clinicians who have continued to use this text throughout its history. Many thanks are due to the special people at F. A. Davis who continue to support this text: Melissa Duffield, George Lang, and Margaret Biblis. A very special thank-you goes to the developmental editor, Susan Williams, of the Williams Company, for all the guidance and experience in completing this edition. Thank you to Jason Torres of J. Torres Photography for the outstanding photography included in this first full-color edition. Thank you to Drs. Joe McCulloch and Ed Mahoney of the School of Allied Health Professions at the Louisiana State University Health Sciences Center–Shreveport for their contribution of several key images throughout this text. Thank you to Dr. Rick Proctor and Dave Walters of DJO Global for supplying equipment for the photo shoot. And finally, but never last, a huge thank-you to the students who participated as models in this edition: Daniel Batteiger, Brooke Versteeg, Allison Colligan, and Austin Biefnes from the University of Indianapolis, and Jamie Umstetter, Brandon Dooley, Kavita Patel, and Matthew Romen from Richard Stockton University.