Accepted for Publication: May 24, 2011.
Author Contributions: Dr LaBella had full access to all the data in the study and takes responsibility for the integrity of the data and the accuracy of the data analysis. Study concept and design: LaBella, Huxford, and Kaufer Christoffel. Acquisition of data: Grissom. Analysis and interpretation of data: LaBella, Grissom, Kim, Peng, and Kaufer Christoffel. Drafting of the manuscript: LaBella, Huxford, Grissom, Kim, and Kaufer Christoffel. Critical revision of the manuscript for important intellectual content: LaBella, Kim, Peng, and Kaufer Christoffel. Statistical analysis: Kim and Peng. Obtained funding: LaBella and Grissom. Administrative, technical, and material support: Huxford and Grissom. Study supervision: LaBella, Huxford, Grissom, and Kaufer Christoffel.
Financial Disclosure: The neuromuscular warm-up is marketed as KIPP (Knee Injury Prevention Program) and was provided at cost.
Funding/Support: This study was funded by grants from Children's Memorial Research Center and Office of Child Advocacy.
Online-Only Materials: This article is featured in the Archives Journal Club. Go to here to download teaching PowerPoint slides.
Additional Contributions: Webitects designed the Web-based injury surveillance system, Roopa Seshadri, PhD, provided statistical expertise, and Brittany Patrick, MPH, assisted with manuscript preparation. John P. Sarwark, BS, Megan K. McDonald, BS, and Jared M. Fairchild, BA, were the research assistants. We thank the Chicago Public Schools Department of Sports Administration for its support and collaboration.
This article was corrected for errors on November 14, 2011.