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Clinical Trial
. 2011 Jul;20(7):1149-56.
doi: 10.1007/s00586-011-1779-5. Epub 2011 Apr 13.

Simultaneous translation on two rods is an effective method for correction of hypokyphosis in AIS: radiographic results of 24 hypokyphotic thoracic scoliosis with 2 years minimum follow-up

Jean-Luc Clément  1 , Edouard Chau, Marie-José Vallade, Anne Geoffray
Affiliations
Clinical Trial

Simultaneous translation on two rods is an effective method for correction of hypokyphosis in AIS: radiographic results of 24 hypokyphotic thoracic scoliosis with 2 years minimum follow-up

Jean-Luc Clément et al. Eur Spine J. 2011 Jul.

Abstract

Recent publications confirm that moderate correction of thoracic hypokyphosis can be achieved by posterior instrumentation with hooks or pedicle screws. Twenty-four prospective and consecutive thoracic adolescent scoliosis patients with hypokyphosis (<20°) were operated on by posterior spinal fusion (PSF) with a specific method of reduction: Simultaneous translation on two rods (ST2R), performed by the same surgeon using stable anchorages such as screws or self-stabilizing claws. Radiographic parameters were measured preoperatively, at 1 month, 1 year and at 2 years minimum follow-up. In the coronal plane, the average main curve was significantly reduced from 51° to 17° and maintained at last follow-up, corresponding to an average correction of 67%. In the sagittal plane, the average kyphosis angle was significantly improved from 9° to 30° postoperatively and to 32° at last follow-up, corresponding to a mean gain of 23°. The 24 patients reported normal kyphosis at last follow-up (≥20°). Reduction of scoliosis by ST2R is an effective method that gives coronal correction equivalent to all screw constructs and allows restoration of normal thoracic kyphosis.

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Figures

Fig. 1
Fig. 1
Simultaneous translation on two rods (ST2R), anteroposterior and sagittal views. a The two rods, bent according to the sagittal profile, are placed on the anchorages without any reduction maneuver thanks to the threaded polyaxial extensions. The rods are properly oriented in the sagittal plane and the two proximal nuts are tightened on the anchorage extensions to lock their rotation. b, c The progressive and simultaneous tightening of all the remaining nuts on both rods performs the translation maneuver
Fig. 2
Fig. 2
A 13.5-year-old girl with hypokyphotic Lenke 1C type AIS. a, b Preoperative standing sagittal and anteroposterior radiographs. c, d Immediate postoperative radiographs. e, f 30-month postoperative radiographs
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Comment in

References

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