Ryan Kelln, DO, FAAP

Attending Physician
Assistant Professor of Clinical Orthopedics, Keck School of Medicine of USC

Ryan Kelln, DO, is a board certified pediatrician, fellowship-trained, with board certification in primary care sports medicine. He is an Attending Physician at the Jackie and Gene Autry Orthopedic Center at Children's Hospital Los Angeles, and an Assistant Professor of Clinical Orthopedics at the Keck School of Medicine of the University of Southern California. As a sports medicine specialist, Dr. Kelln is dedicated to helping athletes of all ages be at their best. He has a personal understanding of the challenges faced by young athletes having grown up playing multiple sports, such as soccer, basketball, baseball, tennis, and track and field, and he continues to pursue a very active lifestyle. Dr. Kelln has experience working with athletes of all ages, and a wide range of skill levels, from the recreational athlete, up to the Division I collegiate, and even the professional level. 
Dr. Kelln enjoys treating the wide range of orthopedic and other medical conditions that impact today’s athletes. His specific interests are in injury prevention, overuse injuries, sports related concussions/head injuries, and the various psychosocial issues that can occur in individual or team sport participation. 


Medical School

Pacific Northwest University of Health Sciences


University of California San Francisco - Fresno/Valley Children's Hospital, Pediatrics


Vanderbilt University Medical Center, Primary Care Sports Medicine



Board Certified, The American Board of Pediatrics

Professional Memberships

American Academy of Pediatrics, 2012 - present
AAP Council on Sports Medicine and Fitness, 2012 - present
American Medical Society for Sports Medicine, 2013 - present


UCSF Fresno Award for Excellence in Teaching, 2014, 2015

Areas of Focus

Pediatric Orthopedics


Kelln R, Diamond AB. Physeal (Growth Plate) Injuries: What to Know and What to be Aware of in Young Athletes. Article published in: Sports Medicine Today: AMSSM’s Quarterly Newsletter for the Public. Spring 2016.
Kelln, R. Right Shoulder Injury: Lesser tuberosity fracture with displacement of subscapularis muscle. Article published in: AAP Council on Sports Medicine and Fitness Case Study Series. February 2016


Sports Medicine