Effect of anatomical variability on stress‐shielding induced by short calcar‐guided stems: Automated finite element analysis of 90 femora

• DOI: 10.1002/jor.24240
• Publication Date: 2019-02-05T12:51:20Z
• Authors: Amelie Sas; Pim Pellikaan; Sjoerd Kolk; Pablo Marty; Thierry Scheerlinck; G. Harry van Lenthe
• Keywords: Calcar; Stress shielding

ABSTRACT Short stem hip implants are becoming increasingly popular since they preserve bone stock and presumably reduce stress‐shielding. However, concerns remain whether suitable for a wide range of patients with varying anatomy. The aim this study was to investigate how femoral anatomy influences stress‐shielding induced by short calcar‐guided across set 90 CT‐based femur models. A computational tool developed that automatically selected the optimal size position stem. Finite element models intact implanted femurs were constructed subjected walking loads. Stress‐shielding evaluated in relevant volumes interest proximal femur. After detailed anatomical analysis, linear regression performed find potential correlations between found be highest regions on medial posterior side. highly significant negative relationship observed density; strong positive valgus orientation respect results reveal stress‐shielding, highlight importance evaluating new implant designs large population taking into account variability. demonstrates such studies can conducted an efficient way using automated workflow. © 2019 Orthopaedic Research Society. Published Wiley Periodicals, Inc. J Orthop Res 9999:1–8, 2019.