Biomechanical effects of calcar screws and bone block augmentation on medial support in locked plating of proximal humeral fractures.

Background: The objective of this study was to investigate the biomechanical effects of medial fracture gap augmentation in locked plating of an unstable 2-part proximal humeral fracture with calcar screws and insertion of a corticocancellous bone block. Furthermore the mechanical behavior of dynamic locking screws in the non-parallel arrangement of a proximal humeral plate was of interest.

Methods: Thirty-two fresh frozen humeri were randomized in four equal groups.