497 Biomechanics of Fragility Hip Fractures and Its Effect on Fixation Implant Choice

Abstract Aim Fragility hip fracture is associated with significant morbidity and mortality. Bone biomechanics are central to orthopaedic surgery as it vital optimise patient outcomes. This review aims provide the relevant of for clinicians. Method The following terms were used in Embase Medline: biomechanics, fracture, proximal femoral fragility fracture. Bibliographies articles scrutinised identify any that not captured. A narrative performed summarise all identified. Results Vertical loading joint results upper cortex being stretched lower compressed. Consequently, neck breaks from subcapital border lesser trochanter, which rare clinical practice. In contrast vertical loading, sideways impact on greater trochanter compresses neck. resulting more often basicervical or trochanteric Dynamic screw (DHS) remains preferable implant stable extracapsular On other hand, intramedullary nail (IM) a better choice unstable due its biomechanical superiority over DHS. Lag placement inferior-central position (inferior anteroposterior lateral radiograph) thought greatest stability Conclusions leads horizontal treat depends specific needs counter different forces caused