Abstract

SOLSONA, Sebastian et al. Modificaciones del plano sagital cervical luego del tratamiento quirurgico posterior en la escoliosis idiopatica del adolescente Lenke 1. Rev. Asoc. Argent. Ortop. Traumatol. [online]. 2014, vol.79, n.3, pp.169-178. ISSN 1852-7434.

Background: As thoracic kyphosis and cervical lordosis are proportionally related, every change in the thoracic sagittal plane will impact on the cervical alignment. Our objective was to detect changes in the sagittal cervical plane at short- and medium term follow-up during surgical treatment, according to the posterior technique. Methods: Retrospective, radiographic case series study performed between January 2005 and April 2009. Inclusion criteria: Lenke type 1 adolescent idiopathic scoliosis, and posterior screw fixation surgery. Radiographic parameters: Cobb angle, uppermost instrumented vertebra, implant density, cervical lordosis, proximal thoracic kyphosis, main thoracic kyphosis, T1 sagittal tilt, global sagittal balance and cervical sagittal balance. Statistical analysis: ANOVA of repetitive samples and Tukey, using the Graph-Pad-Prism. Results: 25 patients. Mean follow-up 4.3 years. Thoracic kyphosis (T5-T12): average, preoperative 26.8o and 20.6o postoperative. Lordosing effect after surgical treatment (p ≤0.001). T1 sagittal tilt and T2-T5 proximal thoracic kyphosis (p ≤0.038) tended to increase at last control. Seventy two per cent of our sample showed rectification or even cervical kyphosis before surgery. Only 44% had certain better alignment at the last follow-up. Higher UIV correlated with a worse cervical plane alignment after surgery. Conclusions: Our derotational concavity technique with poliaxial pedicle screws and titanium 5.5 rod demonstrated a lordosing effect in the thoracic sagittal plane. This was translated into a trunk retropulsion and rectification or lost of lordosis in the sagittal cervical plane in the medium- term follow-up.

Keywords : Cervical sagittal balance; Cervical scoliosis; Cervical kyphosis; Thoracic arthrodesis; T1 tilt.

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