• Jean-Yves Lazennec, Adrien Brusson, and Marc-Antoine Rousseau.
• Service de chirurgie orthopédique, Hôpital Pitié Salpêtrière, Université Pierre et Marie Curie, Assistance Publique-Hôpitaux de Paris, Paris 6, 83 bd de l'hôpital, 75013, Paris, France. lazennec.jy@wanadoo.fr
• Eur Spine J. 2011 Sep 1; 20 Suppl 5: 686-98.

IntroductionThe role of the pelvic area in sagittal balance is evident for spinal surgeons, but the influence of the coxofemoral joint is underestimated and inadequately explained by conventional imagery. Comprehensive analysis of the pelvic and subpelvic sectors as part of the sagittal, frontal and cross-sectional balance of the trunk sheds new light on some spinal diseases and their relation to the pelvis.MethodsThis analysis, based on innovative radiologic methods as the EOS(®) technology but also on a new look at conventional imaging makes it possible to better analyze standing lateral images and seated images.ResultsDisturbances can come from atypical morphotypes or from unusual postures as in aging spine. The measurement of available extension and the concept of available flexion provide new information regarding individual's adaptation to the imbalance induced by disorders of the spine or lower limbs.ConclusionA comprehensive assessment of each patient and in particular of the complex comprising the spine and the pelvis, is essential for understanding each individual's adaptation to the imbalance induced by disorders of the spine or lower limbs.

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