The American Board of Orthopaedic Surgery (ABOS) has posted 152 Knowledge Sources for this year’s ABOS Web-Based Longitudinal Assessment Program (ABOS WLA) that will open from April 13 through May 18, 2020. This includes 101 new Knowledge Sources and 51 Knowledge Sources carried over from last year. Participants will be able to answer the 30 questions pertaining to their 15 chosen Knowledge Sources during the time period. The Knowledge Sources have been chosen by groups of practicing orthopaedic surgeons representing general orthopaedics and each orthopaedic subspecialty. Learn more.