Legaye Jean1. 1. Department of Orthopaedic Surgery, University Hospital UCL Mont-Godinne, B-5530, Yvoir, Belgium, jean.legaye@uclouvain.be.
Abstract
BACKGROUND DATA: The pelvic incidence (PI) was recognized as the key factor of the sagittal balance of the spine. Its value was described own for each individual and unchanged during adulthood. PURPOSE: To bring out the effect of the age and of a sagittal imbalance in the variability of the value of PI. MATERIALS AND METHODS: 200 subjects with chronic low back pain due to sagittal imbalance were compared to 89 normal subjects. For each groups, the cases were divided according to the age (19-40, 6-40 years, over 60 years). The PI and the sagittal positional parameters were measured on large radiographs in standardized standing position. RESULTS: The correlation between age and PI was observed significant only for the >60 years cases. The mean values of PI were significantly greater for these cases. DISCUSSION: An increase of the value of PI was attributable to a twisting mobilization within the sacroiliac joint. It results from a forward projection of the gravity due to a sagittal disturbance and a pelvic compensatory backward rotation. This twisting into the sacroiliac joint was incriminated in the origin of chronic low back pain. CONCLUSION: The sagittal pelvi-spinal imbalance may be incriminated in the increasing of the value of PI by a painful destabilization sacro-iliac, with leads to an increasing of the value of PI.
BACKGROUND DATA: The pelvic incidence (PI) was recognized as the key factor of the sagittal balance of the spine. Its value was described own for each individual and unchanged during adulthood. PURPOSE: To bring out the effect of the age and of a sagittal imbalance in the variability of the value of PI. MATERIALS AND METHODS: 200 subjects with chronic low back pain due to sagittal imbalance were compared to 89 normal subjects. For each groups, the cases were divided according to the age (19-40, 6-40 years, over 60 years). The PI and the sagittal positional parameters were measured on large radiographs in standardized standing position. RESULTS: The correlation between age and PI was observed significant only for the >60 years cases. The mean values of PI were significantly greater for these cases. DISCUSSION: An increase of the value of PI was attributable to a twisting mobilization within the sacroiliac joint. It results from a forward projection of the gravity due to a sagittal disturbance and a pelvic compensatory backward rotation. This twisting into the sacroiliac joint was incriminated in the origin of chronic low back pain. CONCLUSION: The sagittal pelvi-spinal imbalance may be incriminated in the increasing of the value of PI by a painful destabilization sacro-iliac, with leads to an increasing of the value of PI.
Authors: Jean-Marc Mac-Thiong; Eric Berthonnaud; John R Dimar; Randal R Betz; Hubert Labelle Journal: Spine (Phila Pa 1976) Date: 2004-08-01 Impact factor: 3.468
Authors: Oren N Gottfried; Ibrahim Omeis; Vivek A Mehta; Can Solakoglu; Ziya L Gokaslan; Jean-Paul Wolinsky Journal: J Neurosurg Spine Date: 2010-12-03