Biomechanical Comparison of 3 Inferiorly Directed Versus 3 Superiorly Directed Locking Screws on Stability in a 3-Part Proximal Humerus Fracture Model. - Donohue DM; Santoni BG; Stoops TK; Tanner G; Diaz MA; Mighell M (Journal of orthopaedic trauma, 2018)