Resumo

BOSIO, Santiago T; PUIGDEVALL, Miguel; HOKAMA, Jorge  e  MAENZA, Rubén. Análisis con resonancia magnética de la posición de la amígdala cerebelosa antes de la corrección instrumentada por vía posterior y después de ella en pacientes con escoliosis idiopática del adolescente. Rev. Asoc. Argent. Ortop. Traumatol. [online]. 2016, vol.81, n.1, pp.2-6. ISSN 1852-7434.

Objective: To evaluate variations in cerebellar tonsil position after posterior spinal fusion in neurologically intact patients with adolescent idiopathic scoliosis. Methods: We retrospectively evaluated 40 patients with adolescent idiopathic scoliosis and no neurological symptoms that underwent posterior spinal fusion. Anteroposterior and sagittal standing radiographs, and sagittal hindbrain MRI were performed in all patients before and after spinal surgery. We evaluated variations in cerebellar tonsil position in relation to spinal correction and spinal elongation after posterior spinal fusion. Results: Mean preoperative magnitude of the curve was 53.15° and thoracic kyphosis was 35.42º. Mean postoperative values were 7.45º and 27.87º, respectively. The average length of the spine in the coronal plane was 44.5 cm in preoperative x-rays and 48.27 cm in postoperative x-rays. The average length in the sagittal plane was 50.87 cm in preoperative x-rays and 55.13cm in postoperative x-rays. There was no significant difference in the position of the cerebellar tonsil before and after spinal correction (p = 0.6042). Conclusion: Position of the cerebellar tonsil did not change with posterior spinal fusion in patients with adolescent idiopathic scoliosis.

Palavras-chave : Adolescent idiopathic scoliosis; Cerebellar tonsil; Arnold-Chiari malformation; Posterior spinal fusion.

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