European Spine Journal

, Volume 6, Issue 3, pp 163–167 | Cite as

Study of the course of the incidence angle during growth

  • Paolo Mangione
  • Dominique Gomez
  • Jacques Senegas
Original Article


Standing posture is made possible by hip extension and lumbar lordosis. Lumbar lordosis is correlated with pelvic parameters, such as the declivity angle of the upper surface of the sacrum and the incidence angle, which determine the sagittal morphotype. Incidence angle, which is different for each individual, is known to be very important for upright posture, but its course during life has not yet been established. Incidence angle was measured on radiographs of 30 fetuses, 30 children and 30 adults, and results were analysed using the correlation coefficientr and Student's t test. A statistically significant correlation between age and incidence angle was observed. Incidence angle considerably increases during the first months, continues to increase during early years, and stabilizes around the age of 10 years. Incidence is a mark of bipedism, and its role in sagittal balance is essential.

Key words

Sagittal balance Sacral inclination or slope Pelvis Gravity Sagittal plane compensatory mechanisms Posture 


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Copyright information

© Springer-Verlag 1997

Authors and Affiliations

  • Paolo Mangione
    • 1
  • Dominique Gomez
    • 1
  • Jacques Senegas
    • 1
  1. 1.Department of Spine SurgeryPr J Senegas, Pellegrin Tripode HospitalBordeaux CedexFrance

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