title: Femoral Offset (3D) in Patients without Osteoarthritis - Index Values from 200 Hip Joints.
abstract: BACKGROUND
  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.
  
  
  METHODS
  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.
  
  
  RESULTS
  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.
  
  
  CONCLUSIONS
  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.
authors.affiliation: Department of Orthopaedics, Center for Musculoskeletal Surgery and Berlin-Brandenburg Center for Regenerative Therapies, Charité - University Medicine Berlin, Charitéplatz 1, D-10117 Berlin, Germany.
authors.forename: Bernd
authors.initials: B
authors.lastname: Preininger
authors.forename: Kathrin
authors.initials: K
authors.lastname: Schmorl
authors.forename: Philipp
authors.initials: P
authors.lastname: von Roth
authors.forename: Tobias
authors.initials: T
authors.lastname: Winkler
authors.forename: Georg
authors.initials: G
authors.lastname: Matziolis
authors.forename: Carsten
authors.initials: C
authors.lastname: Perka
authors.forename: Stephan
authors.initials: S
authors.lastname: Tohtz
keywords: Computed tomography; femoral offset; hip anatomy; index values; osteoarthritis.