Biomechanical analysis of “Barrel hoop plate” technique for the posterolateral fragments of tibial plateau fractures with different displacement tendency

•The 2.7 mm “Barrel hoop plate” had a greater capacity of anti-three-dimension axes displacement of the posterolateral fragments.•The 3.5 anterolateral plate had the advantage in anti-lateral displacement and anti-inferior displacement but was weak at anti-posterior displacement of posterolateral fragments.•The 2.7 mm posterior buttress plate was stronger in anti-posterior, however, weak in anti-inferior displacement capacity.