Femoral Offset (3D) in Patients without Osteoarthritis – Index Values from 200 Hip Joints
Bernd Preininger*, Kathrin Schmorl, Philipp von Roth, Tobias Winkler, Georg Matziolis, Carsten Perka, Stephan Tohtz
Department of Orthopaedics, Center for Musculoskeletal Surgery and Berlin-Brandenburg Center for Regenerative Therapies, Charité - University Medicine Berlin, Charitéplatz 1, D-10117 Berlin, Germany
Femoral offset (FO) is a crucial parameter for hip joint biomechanics. Reference values for FO are particularly important when joint geometry has to be reconstructed during surgical interventions. Such reference values are scarce in literature and have mainly been obtained from osteoarthritis (OA) patients. The aim of this study was to conduct a patient-specific study of FO without osteoarthritis and to create a dataset of FO index values.
Materials and Methodology:
One hundred (49 female, 51 male; mean age: 59 (18 - 83) years) pelvic computed tomography (CT) scans were analyzed to determine FO in each patient. Bilateral symmetry and correlation between demographic data and FO were analyzed.
The mean FO ± SD was different for male (4.36 ± 0.56 cm) and female patients (3.95 ± 0.35 cm) (p <.0001). No Side differences of FO were observed in male and female patients. Significant correlation between height and FO was only observed in male patients.
The values obtained in this study can be used as index values for the restoration and evaluation of hip geometry. For men, FO can be approximated using the correlation between FO and height.
Keywords: : Computed tomography, femoral offset, hip anatomy, index values, osteoarthritis.
open-access license: This is an open access article licensed under the terms of the Creative Commons Attribution Non-Commercial License (http://creativecommons.org/licenses/by-nc/3.0/) which permits unrestricted, non-commercial use, distribution and reproduction in any medium, provided the work is properly cited.
* Address correspondence to this author at the Department of Orthopaedics, Center for Musculoskeletal Surgery, Charité - University Medicine Berlin, Berlin, Charitéplatz 1, D-10117 Berlin, Germany; Tel: +4930450 659096; Fax: +4930450515911; E-mail: Bernd.Preininger@charite.de