Levels of evidence at the Orthopaedic Trauma Association annual meetings.

Objective: To examine the strength of evidence presented at the Orthopaedic Trauma Association (OTA) annual meetings before and after the level of evidence guidelines became popular in the literature.

Data Sources: 10 years of abstracts from OTA podium presentations, preguidelines (1998-2002), and postguidelines (2007-2011).

Study Selection: All abstracts were blinded and randomized for review.