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Anatomy Research International
Volume 2014 (2014), Article ID 594650, 9 pages
http://dx.doi.org/10.1155/2014/594650
Research Article

Pelvic Incidence: A Predictive Factor for Three-Dimensional Acetabular Orientation—A Preliminary Study

1Service de Neurologie Pédiatrique, CHU Timone Enfants, 13385 Marseille, France
2Département de Médecine Physique et de Réadaptation, CHU Caremeau, 30029 Nîmes, France
3Laboratoire d’Anatomie, UFR de Médecine Montpellier-Nîmes, 30907 Nîmes, France
4Service de Chirurgie Orthopédique Pédiatrique, CHU la Timone Enfants, 264 Rue Saint-Pierre, 13385 Marseille Cedex 05, France
5Service d’Orthopédie, Clinique Universitaires UCL. de Mont-Godinne, 5530 Yvoir, Belgium
6UMR 7179 CNRS, Mécanismes Adaptatifs: des Organismes aux Communautés, Pavillon d’Anatomie Comparée, Museum National Histoire Naturelle, 75005 Paris, France
7INSERM U 215, CHU Raymond Poincaré, 92380 Garches, France

Received 30 August 2013; Revised 18 November 2013; Accepted 5 February 2014; Published 18 March 2014

Academic Editor: Ayhan Comert

Copyright © 2014 Christophe Boulay et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

Acetabular cup orientation (inclination and anteversion) is a fundamental topic in orthopaedics and depends on pelvis tilt (positional parameter) emphasising the notion of a safe range of pelvis tilt. The hypothesis was that pelvic incidence (morphologic parameter) could yield a more accurate and reliable assessment than pelvis tilt. The aim was to find out a predictive equation of acetabular 3D orientation parameters which were determined by pelvic incidence to include in the model. The second aim was to consider the asymmetry between the right and left acetabulae. Twelve pelvic anatomic specimens were measured with an electromagnetic Fastrak system (Polhemus Society) providing 3D position of anatomical landmarks to allow measurement of acetabular and pelvic parameters. Acetabulum and pelvis data were correlated by a Spearman matrix. A robust linear regression analysis provided prediction of acetabulum axes. The orientation of each acetabulum could be predicted by the incidence. The incidence is correlated with the morphology of acetabula. The asymmetry of the acetabular roof was correlated with pelvic incidence. This study allowed analysis of relationships of acetabular orientation and pelvic incidence. Pelvic incidence (morphologic parameter) could determine the safe range of pelvis tilt (positional parameter) for an individual and not a group.