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Sagittal balance correction of idiopathic scoliosis using the in situ contouring technique

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Abstract

Purpose

Idiopathic scoliosis can lead to sagittal imbalance. The relationship between thoracic hyper- and hypo-kyphotic segments, vertebral rotation and coronal curve was determined. The effect of segmental sagittal correction by in situ contouring was analyzed.

Methods

Pre- and post-operative radiographs of 54 scoliosis patients (Lenke 1 and 3) were analyzed at 8 years follow-up. Cobb angles and vertebral rotation were determined. Sagittal measurements were: kyphosis T4–T12, T4–T8 and T9–T12, lordosis L1–S1, T12–L2 and L3–S1, pelvic incidence, pelvic tilt, sacral slope, T1 and T9 tilt.

Results

Thoracic and lumbar curves were significantly reduced (p = 0.0001). Spino-pelvic parameters, T1 and T9 tilt were not modified. The global T4–T12 kyphosis decreased by 2.1° on average (p = 0.066). Segmental analysis evidenced a significant decrease of T4–T8 hyperkyphosis by 6.6° (p = 0.0001) and an increase of segmental hypokyphosis T9–T12 by 5.0° (p = 0.0001). Maximal vertebral rotation was located at T7, T8 or T9 and correlated (r = 0.422) with the cranial level of the hypokyphotic zone (p = 0.003). This vertebra or its adjacent levels corresponded to the coronal apex in 79.6 % of thoracic curves.

Conclusions

Lenke 1 and 3 curves can show normal global kyphosis, divided in cranial hyperkyphosis and caudal hypokyphosis. The cranial end of hypokyphosis corresponds to maximal rotation. These vertebrae have most migrated anteriorly and laterally. The sagittal apex between segmental hypo- and hyper-kyphosis corresponds to the coronal thoracic apex. A segmental sagittal imbalance correction is achieved by in situ contouring. The concept of segmental imbalance is useful when determining the levels on which surgical detorsion may be focused.

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Authors and Affiliations

  1. Service de Chirurgie du Rachis, Hôpitaux Universitaires de Strasbourg, 1, Place de l’Hôpital, B.P. 426, 67091, Strasbourg Cedex, France

    Yann Philippe Charles, Julia Bouchaïb, Axel Walter, Sébastien Schuller & Jean-Paul Steib

  2. Département de Santé Publique, Hôpitaux Universitaires de Strasbourg, Strasbourg Cedex, France

    Erik André Sauleau

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  1. Yann Philippe Charles
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  2. Julia Bouchaïb
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  3. Axel Walter
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  4. Sébastien Schuller
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  6. Jean-Paul Steib
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Correspondence to Yann Philippe Charles.

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Charles, Y.P., Bouchaïb, J., Walter, A. et al. Sagittal balance correction of idiopathic scoliosis using the in situ contouring technique. Eur Spine J 21, 1950–1956 (2012). https://doi.org/10.1007/s00586-012-2356-2

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  • DOI: https://doi.org/10.1007/s00586-012-2356-2

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