Review ArticlesAnatomy and Biomechanics of the Lateral Side of the Knee and Surgical ImplicationsJames, Evan W. BS*; LaPrade, Christopher M. BA*; LaPrade, Robert F. MD, PhD*,† Author Information *Steadman Philippon Research Institute †The Steadman Clinic, Vail, CO R.F.L. has received funding not in relation to this work through a Health East Norway Grant. Disclosure: R.F.L. is a paid consultant, lecturer, and receives royalties from Arthrex and Smith & Nephew. The remaining authors declare no conflict of interest. Reprints: Robert F. LaPrade, MD, PhD, The Steadman Clinic, 181 W. Meadow Drive, Suite 400, Vail, CO 81657. Sports Medicine and Arthroscopy Review: March 2015 - Volume 23 - Issue 1 - p 2-9 doi: 10.1097/JSA.0000000000000040 Buy Metrics Abstract A detailed understanding of the anatomy and biomechanics of the lateral knee is essential for the clinical diagnosis and surgical treatment of lateral-sided knee injuries. In the past, the structure and function of the lateral and posterolateral knee was poorly understood and was dubbed by some as “the dark side of the knee.” However, recent advances in quantitative anatomy and biomechanics of this region have led to the development of anatomic-based reconstruction techniques and improved objective and subjective patient-based outcomes. Although the lateral knee consists of 28 unique structures, the primary lateral knee stabilizers include the fibular collateral ligament, popliteus tendon, and popliteofibular ligament. Together, these structures function to resist lateral compartment varus gapping and rotatory knee instability. This work will summarize the current state of knowledge regarding the anatomy and biomechanics of the lateral knee structures, while emphasizing implications for surgical treatment. Copyright © 2015 Wolters Kluwer Health, Inc. All rights reserved.