Review ArticlesPhysical Examination and Imaging of the Lateral Collateral Ligament and Posterolateral Corner of the KneeDevitt, Brian M. MD, FRCS*; Whelan, Daniel B. MD, FRCSC† Author Information *Sports Surgery Clinic, Dublin, Ireland †Department of Orthopaedic Surgery, University of Toronto, St Michael’s Hospital, Toronto, ON, Canada Disclosure: The authors declare no conflict of interest. Reprints: Daniel B. Whelan, MD, FRCSC, Department of Orthopaedic Surgery, University of Toronto, St Michael’s Hospital, 55 Queen Street E, Suite 800, Toronto, ON, Canada M5C 1R6. Sports Medicine and Arthroscopy Review 23(1):p 10-16, March 2015. | DOI: 10.1097/JSA.0000000000000046 Buy Metrics Abstract The initial assessment of injury to the lateral collateral ligament and posterolateral corner is often challenging, particularly in the context of a multiligamentous injury. Although advanced imaging techniques have enhanced the evaluation of knee injuries, the significant, and often unique, contribution of clinical examination should not be overlooked. Clinical examination starts with a thorough history, which is instrumental in elucidating not only the patient’s symptomatology but also the mechanism of injury. Differentiating between acute and chronic injury and teasing out the patient’s functional limitations are instructive in defining the appropriate treatment plan. The treating physician needs patience, vigilance, and a variety of diagnostic tools to reach a precise diagnosis. Each injury should be approached in a methodical and systematic manner to ensure an accurate initial assessment. This review provides a step-wise approach to the clinical assessment of the lateral collateral ligament and posterolateral corner injured knee. Adjunctive imaging modalities and investigations are also discussed. Copyright © 2015 Wolters Kluwer Health, Inc. All rights reserved.