Journal of Orthopaedic Trauma Publish Ahead of Print DOI: 10.1097/BOT.0000000000000069 ACCEPTED Copyright Ó Lippincott Williams & Wilkins. All rights reserved. Assessment of Intra-osseous Femoral Head Pressures During Cement Augmentation of The Perforated Proximal Femur Nail Antirotation (PFNA) blade Michael Blankstein, MD, FRCSC Daniel Widmer, MSc Michael Götzen, MD Ladina Hofmann-Fliri, MSc Robert G Richards, PhD Boyko Gueorguiev, PhD Markus Windolf, Dipl Ing AO Research Institute Davos, Davos, Switzerland Correspondence: Blanksteinm@gmail.com Address: AO Foundation Clavadelerstrasse 8 7270 Davos, Switzerland Tel: +41 81 414 23 27 Fax: +41 81 414 22 88 Conflict of interest: None of the authors are compensated and there are no other institutional subsidies, corporate affiliations, or funding sources supporting this work.