Wright DJ, Bui CN, Ihn HE, et al. - This study was carried out to assess axial fracture obliquity and posterior inferior comminution in vertically oriented femoral neck fractures (FNFs) in the physiologically young patient. Researchers constructed four Pauwels III FNF models in synthetic femurs: vertically oriented in the coronal plane, the coronal plane with axial obliquity, the coronal plane with posterior inferior comminution, and the coronal plane with axial obliquity and posterior inferior comminution. A custom testing jig combining axial preloading and torsional ramp-loading were applied to perform-quasistatic cyclic ramp-loading to failure. The preliminary endpoint was torque to failure, characterized as angular displacement ≥ 5 degrees. The outcomes of this study indicated that posterior inferior comminution significantly affects torque to failure in vertically oriented FNFs. The data considered that three peripherally placed cannulated screws may resist combined axial and torsional loading better than a sliding hip screw construct.