Bilateral Anterior Knee Pain in a High School Cross-Country Runner: An Atypical EtiologyMacDonald, James MD, MPHClinical Journal of Sport Medicine: September 2017 - Volume 27 - Issue 5 - p e72–e73 doi: 10.1097/JSM.0000000000000383 Case Report Abstract Author Information Abstract: Anterior knee pain is a common complaint found in distance runners, and can be the end result of a variety of benign processes. A 17-year-old female cross-country runner presented to a sports medicine clinic with insidious onset of bilateral patellofemoral pain (PFP). In the workup of the significant quadriceps weakness discovered on her initial examination, a principal contributing cause of her PFP, she was found to have a form of spinal muscular atrophy, an uncommon neurodegenerative disease that typically requires multidisciplinary medical care. Her case provides a good example for clinicians to consider, at times, an in-depth assessment of the root causes of benign conditions. Division of Sports Medicine, Department of Pediatrics, Nationwide Children's Hospital, Ohio State University College of Medicine, Columbus, Ohio. Corresponding Author: James MacDonald, MD, MPH, Division of Sports Medicine, Department of Pediatrics, Nationwide Children's Hospital, 584 County Line Rd, West, Westerville, OH 43082 (firstname.lastname@example.org). The author reports no conflicts of interest. Received April 04, 2016 Accepted July 05, 2016 Copyright © 2017 Wolters Kluwer Health, Inc. All rights reserved.